CVE-2021-4235

unknown

Published 2022-12-28 · Modified 2026-02-04

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2.2.8-1`
sid	Fixed	`2.2.8-1`
forky	Fixed	`2.2.8-1`
bullseye	Fixed	`2.2.8-1`
bookworm	Fixed	`2.2.8-1`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	gopkg.in/yaml.v2	`<2.2.3`	`2.2.3`
Go	github.com/go-yaml/yaml	`<=2.1.0`
Go	github.com/go-yaml/yaml

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.