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Vulnerability details: VCID-br6f-f5p9-t7g3
Vulnerability ID VCID-br6f-f5p9-t7g3
Aliases CVE-2026-42256
GHSA-87pf-fpwv-p7m7
Summary
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-606 Unchecked Input for Loop Condition
CWE-1322 Use of Blocking Code in Single-threaded, Non-blocking Context
CWE-770 Allocation of Resources Without Limits or Throttling
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42256.json
epss 0.00046 https://api.first.org/data/v1/epss?cve=CVE-2026-42256
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv4 6.0 https://github.com/ruby/net-imap
generic_textual MODERATE https://github.com/ruby/net-imap
cvssv4 6 https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
cvssv4 6.0 https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
generic_textual MODERATE https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
ssvc Track https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
cvssv4 6 https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
cvssv4 6.0 https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
generic_textual MODERATE https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
ssvc Track https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
cvssv4 6 https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
cvssv4 6.0 https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
generic_textual MODERATE https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
ssvc Track https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
cvssv4 6 https://github.com/ruby/net-imap/releases/tag/v0.4.24
cvssv4 6.0 https://github.com/ruby/net-imap/releases/tag/v0.4.24
generic_textual MODERATE https://github.com/ruby/net-imap/releases/tag/v0.4.24
ssvc Track https://github.com/ruby/net-imap/releases/tag/v0.4.24
cvssv4 6 https://github.com/ruby/net-imap/releases/tag/v0.5.14
cvssv4 6.0 https://github.com/ruby/net-imap/releases/tag/v0.5.14
generic_textual MODERATE https://github.com/ruby/net-imap/releases/tag/v0.5.14
ssvc Track https://github.com/ruby/net-imap/releases/tag/v0.5.14
cvssv4 6 https://github.com/ruby/net-imap/releases/tag/v0.6.4
cvssv4 6.0 https://github.com/ruby/net-imap/releases/tag/v0.6.4
generic_textual MODERATE https://github.com/ruby/net-imap/releases/tag/v0.6.4
ssvc Track https://github.com/ruby/net-imap/releases/tag/v0.6.4
cvssv4 6 https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
cvssv4 6.0 https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
generic_textual MODERATE https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
ssvc Track https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
cvssv4 6.0 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42256.yml
generic_textual MODERATE https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42256.yml
cvssv4 6.0 https://nvd.nist.gov/vuln/detail/CVE-2026-42256
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-42256
cvssv4 6.0 https://www.rfc-editor.org/rfc/rfc7804.html#page-15
generic_textual MODERATE https://www.rfc-editor.org/rfc/rfc7804.html#page-15
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42256.json
https://api.first.org/data/v1/epss?cve=CVE-2026-42256
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/ruby/net-imap
https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
https://github.com/ruby/net-imap/releases/tag/v0.4.24
https://github.com/ruby/net-imap/releases/tag/v0.5.14
https://github.com/ruby/net-imap/releases/tag/v0.6.4
https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42256.yml
https://nvd.nist.gov/vuln/detail/CVE-2026-42256
https://www.rfc-editor.org/rfc/rfc7804.html#page-15
1136823 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1136823
2468500 https://bugzilla.redhat.com/show_bug.cgi?id=2468500
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-42256.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:N/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:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:04:26Z/ Found at https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:04:26Z/ Found at https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:04:26Z/ Found at https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/releases/tag/v0.4.24
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/releases/tag/v0.4.24
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:04:26Z/ Found at https://github.com/ruby/net-imap/releases/tag/v0.4.24
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/releases/tag/v0.5.14
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/releases/tag/v0.5.14
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:04:26Z/ Found at https://github.com/ruby/net-imap/releases/tag/v0.5.14
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/releases/tag/v0.6.4
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/releases/tag/v0.6.4
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:04:26Z/ Found at https://github.com/ruby/net-imap/releases/tag/v0.6.4
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:04:26Z/ Found at https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://github.com/rubysec/ruby-advisory-db/blob/master/gems/net-imap/CVE-2026-42256.yml
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42256
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Found at https://www.rfc-editor.org/rfc/rfc7804.html#page-15
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.14553
EPSS Score 0.00046
Published At May 30, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-05-30T23:09:50.689350+00:00 EPSS Importer Import https://epss.cyentia.com/epss_scores-current.csv.gz 38.6.0