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Vulnerability details: VCID-k874-59fj-9fcg
Vulnerability ID VCID-k874-59fj-9fcg
Aliases CVE-2021-4235
GHSA-r88r-gmrh-7j83
Summary YAML Go package vulnerable to denial of service Due to unbounded alias chasing, a maliciously crafted YAML file can cause the system to consume significant system resources. If parsing user input, this may be used as a denial of service vector.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-400 Uncontrolled Resource Consumption
System Score Found at
cvssv3 5.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4235.json
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00036 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00036 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
epss 0.00053 https://api.first.org/data/v1/epss?cve=CVE-2021-4235
cvssv3.1 5.5 https://github.com/go-yaml/yaml
generic_textual MODERATE https://github.com/go-yaml/yaml
cvssv3.1 5.5 https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
generic_textual MODERATE https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
ssvc Track https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
cvssv3.1 5.5 https://github.com/go-yaml/yaml/pull/375
generic_textual MODERATE https://github.com/go-yaml/yaml/pull/375
ssvc Track https://github.com/go-yaml/yaml/pull/375
cvssv3.1 5.5 https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
generic_textual MODERATE https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
cvssv3.1 5.5 https://nvd.nist.gov/vuln/detail/CVE-2021-4235
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-4235
cvssv3.1 5.5 https://pkg.go.dev/vuln/GO-2021-0061
generic_textual MODERATE https://pkg.go.dev/vuln/GO-2021-0061
ssvc Track https://pkg.go.dev/vuln/GO-2021-0061
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4235.json
https://api.first.org/data/v1/epss?cve=CVE-2021-4235
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4235
https://github.com/go-yaml/yaml
https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
https://github.com/go-yaml/yaml/pull/375
https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
https://nvd.nist.gov/vuln/detail/CVE-2021-4235
https://pkg.go.dev/vuln/GO-2021-0061
2156727 https://bugzilla.redhat.com/show_bug.cgi?id=2156727
RHSA-2022:7398 https://access.redhat.com/errata/RHSA-2022:7398
RHSA-2023:0569 https://access.redhat.com/errata/RHSA-2023:0569
RHSA-2023:0570 https://access.redhat.com/errata/RHSA-2023:0570
RHSA-2023:1326 https://access.redhat.com/errata/RHSA-2023:1326
RHSA-2023:3615 https://access.redhat.com/errata/RHSA-2023:3615
RHSA-2023:3742 https://access.redhat.com/errata/RHSA-2023:3742
USN-6287-1 https://usn.ubuntu.com/6287-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/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-2021-4235.json
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: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/go-yaml/yaml
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

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none
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
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

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none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-11T16:24:34Z/ Found at https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/go-yaml/yaml/pull/375
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-11T16:24:34Z/ Found at https://github.com/go-yaml/yaml/pull/375
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://lists.debian.org/debian-lts-announce/2023/07/msg00001.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

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-11T16:24:34Z/ Found at https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-4235
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: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://pkg.go.dev/vuln/GO-2021-0061
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-11T16:24:34Z/ Found at https://pkg.go.dev/vuln/GO-2021-0061
Exploit Prediction Scoring System (EPSS)
Percentile 0.09766
EPSS Score 0.00034
Published At April 21, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:05:53.200850+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/12/GHSA-r88r-gmrh-7j83/GHSA-r88r-gmrh-7j83.json 38.0.0