CVE-2021-4235

low-risk

Published 2022-12-27

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.

Do I need to act?

0.05% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.5/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Yaml

Affected Vendors

Yaml Project

References (8)

Patch https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241

Exploit https://github.com/go-yaml/yaml/pull/375

https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html

Third Party Advisory https://pkg.go.dev/vuln/GO-2021-0061

Patch https://github.com/go-yaml/yaml/commit/bb4e33bf68bf89cad44d386192cbed201f35b241

Exploit https://github.com/go-yaml/yaml/pull/375

https://lists.debian.org/debian-lts-announce/2023/07/msg00001.html

Third Party Advisory https://pkg.go.dev/vuln/GO-2021-0061

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low-risk

Severity 18/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal