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Vulnerability details: VCID-9x9w-2k98-wydm
Vulnerability ID VCID-9x9w-2k98-wydm
Aliases CVE-2023-28756
GHSA-fg7x-g82r-94qc
Summary Ruby Time component ReDoS issue A ReDoS issue was discovered in the Time component through 0.2.1 in Ruby through 3.2.1. The Time parser mishandles invalid URLs that have specific characters. It causes an increase in execution time for parsing strings to Time objects. The fixed versions are 0.1.1 and 0.2.2.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-1333 Inefficient Regular Expression Complexity
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-20 Improper Input Validation
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-28756.json
epss 0.00587 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00587 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00587 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00651 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00707 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00826 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
epss 0.00914 https://api.first.org/data/v1/epss?cve=CVE-2023-28756
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-fg7x-g82r-94qc
cvssv3.1 7.5 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/time/CVE-2023-28756.yml
generic_textual HIGH https://github.com/rubysec/ruby-advisory-db/blob/master/gems/time/CVE-2023-28756.yml
cvssv3.1 7.5 https://github.com/ruby/time
generic_textual HIGH https://github.com/ruby/time
cvssv3.1 7.5 https://github.com/ruby/time/releases
generic_textual HIGH https://github.com/ruby/time/releases
ssvc Track https://github.com/ruby/time/releases/
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
generic_textual HIGH https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html
generic_textual HIGH https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html
cvssv3.1 7.5 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA/
cvssv3.1 7.5 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T/
cvssv3.1 7.5 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
ssvc Track https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z/
cvssv3.1 7.5 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
cvssv3.1 7.5 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
cvssv3.1 7.5 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2023-28756
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2023-28756
cvssv3.1 7.5 https://security.gentoo.org/glsa/202401-27
generic_textual HIGH https://security.gentoo.org/glsa/202401-27
ssvc Track https://security.gentoo.org/glsa/202401-27
cvssv3.1 7.5 https://security.netapp.com/advisory/ntap-20230526-0004
generic_textual HIGH https://security.netapp.com/advisory/ntap-20230526-0004
ssvc Track https://security.netapp.com/advisory/ntap-20230526-0004/
cvssv3.1 7.5 https://www.ruby-lang.org/en/downloads/releases
generic_textual HIGH https://www.ruby-lang.org/en/downloads/releases
ssvc Track https://www.ruby-lang.org/en/downloads/releases/
cvssv3.1 7.5 https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released
generic_textual HIGH https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released
ssvc Track https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/
cvssv3.1 7.5 https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756
generic_textual HIGH https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756
cvssv3 7.5 https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/
ssvc Track https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-28756.json
https://api.first.org/data/v1/epss?cve=CVE-2023-28756
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-28756
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/ruby/time
https://github.com/ruby/time/releases
https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
https://security.gentoo.org/glsa/202401-27
https://security.netapp.com/advisory/ntap-20230526-0004
https://www.ruby-lang.org/en/downloads/releases
https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released
https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756
https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/
1036283 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1036283
1038408 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038408
2184061 https://bugzilla.redhat.com/show_bug.cgi?id=2184061
CVE-2023-28756 https://nvd.nist.gov/vuln/detail/CVE-2023-28756
CVE-2023-28756.YML https://github.com/rubysec/ruby-advisory-db/blob/master/gems/time/CVE-2023-28756.yml
FFZANOQA4RYX7XCB42OO3P24DQKWHEKA https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA/
G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T/
GHSA-fg7x-g82r-94qc https://github.com/advisories/GHSA-fg7x-g82r-94qc
ntap-20230526-0004 https://security.netapp.com/advisory/ntap-20230526-0004/
releases https://github.com/ruby/time/releases/
releases https://www.ruby-lang.org/en/downloads/releases/
RHSA-2023:3291 https://access.redhat.com/errata/RHSA-2023:3291
RHSA-2023:3821 https://access.redhat.com/errata/RHSA-2023:3821
RHSA-2023:7025 https://access.redhat.com/errata/RHSA-2023:7025
RHSA-2024:1431 https://access.redhat.com/errata/RHSA-2024:1431
RHSA-2024:1576 https://access.redhat.com/errata/RHSA-2024:1576
RHSA-2024:3500 https://access.redhat.com/errata/RHSA-2024:3500
RHSA-2024:3838 https://access.redhat.com/errata/RHSA-2024:3838
RHSA-2026:7305 https://access.redhat.com/errata/RHSA-2026:7305
RHSA-2026:7307 https://access.redhat.com/errata/RHSA-2026:7307
RHSA-2026:8838 https://access.redhat.com/errata/RHSA-2026:8838
ruby-3-2-0-released https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/
USN-6055-1 https://usn.ubuntu.com/6055-1/
USN-6087-1 https://usn.ubuntu.com/6087-1/
USN-6181-1 https://usn.ubuntu.com/6181-1/
WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-28756.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/rubysec/ruby-advisory-db/blob/master/gems/time/CVE-2023-28756.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/ruby/time
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/ruby/time/releases
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://github.com/ruby/time/releases/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.debian.org/debian-lts-announce/2024/09/msg00000.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FFZANOQA4RYX7XCB42OO3P24DQKWHEKA
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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physical

low

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G76GZG3RAGYF4P75YY7J7TGYAU7Z5E2T
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WMIOPLBAAM3FEQNAXA2L7BDKOGSVUT5Z
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2023-28756
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://security.gentoo.org/glsa/202401-27
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

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unchanged

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Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://security.gentoo.org/glsa/202401-27
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://security.netapp.com/advisory/ntap-20230526-0004
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://security.netapp.com/advisory/ntap-20230526-0004/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.ruby-lang.org/en/downloads/releases
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://www.ruby-lang.org/en/downloads/releases/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2024-01-26T19:59:50Z/ Found at https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/
Exploit Prediction Scoring System (EPSS)
Percentile 0.69183
EPSS Score 0.00587
Published At April 24, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:51:05.426822+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/gem/time/CVE-2023-28756.yml 38.0.0