Home/CVE/Due to unbounded alias chasing, a maliciously crafted YAML file can cause the system to consume significant system resou
CVE

CVE-2021-4235

Due to unbounded alias chasing, a maliciously crafted YAML file can cause the system to consume significant system resou

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.

MEDIUM · CVSS 5.5 EPSS 0.00034
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
▤

Affected Products & Versions

1
yaml project yaml< 2.2.3
▤

Affected Packages

2
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/go-yaml/yaml MODERATE
Go gopkg.in/yaml.v2 MODERATE fixed in 2.2.3
⚠

Public Exploits & PoCs

1
pocgithub.com · pull/375github.com
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · security@golang.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Dec 2022 · 10:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

8
usnUSN-6287-1
rhsaRHSA-2023:1326Moderate
rhsaRHSA-2023:3742Moderate
msrcCVE-2021-4235
rhsaRHSA-2023:0570Moderate
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html
https://pkg.go.dev/vuln/GO-2021-0061Third Party Advisory
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