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Fencer Intel
medium 4.0

CVE-2011-1091 json

libymsg.c in the Yahoo!

published 2011-03-14 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1105

cvss
4.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • pidgin Debian 14, Debian 13, Debian 12 2.7.11-1

debian advisories DEBIAN-CVE-2011-1091

  • pidgin RHEL 4 2.6.6-7.el4
  • pidgin RHEL 5 PRODUCTIVITY, RHEL 5 2.6.6-5.el5_7.1
  • finch RHEL 4 2.6.6-7.el4
  • finch RHEL 5 PRODUCTIVITY, RHEL 5 2.6.6-5.el5_7.1
  • libpurple RHEL 4 2.6.6-7.el4
  • libpurple RHEL 5 PRODUCTIVITY, RHEL 5 2.6.6-5.el5_7.1
  • pidgin-perl RHEL 4 2.6.6-7.el4
  • pidgin-perl RHEL 5 PRODUCTIVITY, RHEL 5 2.6.6-5.el5_7.1

red hat advisories RHSA-2011:1371RHSA-2011:0616

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-1091 updated cvss 3.5

Pidgin: Multiple NULL pointer dereference flaws in Yahoo protocol plug-in

  • Red Hat Enterprise Linux AS version 4 finch 2.6.6-7.el4, pidgin 2.6.6-7.el4, libpurple 2.6.6-7.el4, pidgin-perl 2.6.6-7.el4, libpurple-tcl 2.6.6-7.el4, libpurple-perl 2.6.6-7.el4 Red Hat Enterprise Linux Desktop (v. 5 client) finch 2.6.6-5.el5_7.1, pidgin 2.6.6-5.el5_7.1, libpurple 2.6.6-5.el5_7.1, pidgin-perl 2.6.6-5.el5_7.1, libpurple-tcl 2.6.6-5.el5_7.1, libpurple-perl 2.6.6-5.el5_7.1
    fixed: vendor fix RHSA-2011:1371
  • Red Hat Enterprise Linux Desktop (v. 6) finch 2.7.9-3.el6, pidgin 2.7.9-3.el6, libpurple 2.7.9-3.el6, pidgin-perl 2.7.9-3.el6, libpurple-tcl 2.7.9-3.el6, libpurple-perl 2.7.9-3.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) finch 2.7.9-3.el6, pidgin 2.7.9-3.el6, libpurple 2.7.9-3.el6, pidgin-perl 2.7.9-3.el6, libpurple-tcl 2.7.9-3.el6, libpurple-perl 2.7.9-3.el6
    fixed: vendor fix RHSA-2011:0616
  • Red Hat Enterprise Linux Desktop version 4 finch 2.6.6-7.el4, pidgin 2.6.6-7.el4, libpurple 2.6.6-7.el4, pidgin-perl 2.6.6-7.el4, libpurple-tcl 2.6.6-7.el4, libpurple-perl 2.6.6-7.el4 Red Hat Enterprise Linux ES version 4 finch 2.6.6-7.el4, pidgin 2.6.6-7.el4, libpurple 2.6.6-7.el4, pidgin-perl 2.6.6-7.el4, libpurple-tcl 2.6.6-7.el4, libpurple-perl 2.6.6-7.el4
    fixed: vendor fix RHSA-2011:1371
  • Red Hat Enterprise Linux Server Optional (v. 6) finch 2.7.9-3.el6, pidgin 2.7.9-3.el6, libpurple 2.7.9-3.el6, pidgin-perl 2.7.9-3.el6, libpurple-tcl 2.7.9-3.el6, libpurple-perl 2.7.9-3.el6 Red Hat Enterprise Linux Workstation (v. 6) finch 2.7.9-3.el6, pidgin 2.7.9-3.el6, libpurple 2.7.9-3.el6, pidgin-perl 2.7.9-3.el6, libpurple-tcl 2.7.9-3.el6, libpurple-perl 2.7.9-3.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) finch 2.7.9-3.el6, pidgin 2.7.9-3.el6, libpurple 2.7.9-3.el6, pidgin-perl 2.7.9-3.el6, libpurple-tcl 2.7.9-3.el6, libpurple-perl 2.7.9-3.el6
    fixed: vendor fix RHSA-2011:0616
  • Red Hat Enterprise Linux WS version 4 finch 2.6.6-7.el4, pidgin 2.6.6-7.el4, libpurple 2.6.6-7.el4, pidgin-perl 2.6.6-7.el4, libpurple-tcl 2.6.6-7.el4, libpurple-perl 2.6.6-7.el4 Red Hat RHEL Desktop Workstation (v. 5 client) finch 2.6.6-5.el5_7.1, pidgin 2.6.6-5.el5_7.1, libpurple 2.6.6-5.el5_7.1, pidgin-perl 2.6.6-5.el5_7.1, libpurple-tcl 2.6.6-5.el5_7.1, libpurple-perl 2.6.6-5.el5_7.1 Red Hat RHEL Optional Productivity Applications (v. 5 server) finch 2.6.6-5.el5_7.1, pidgin 2.6.6-5.el5_7.1, libpurple 2.6.6-5.el5_7.1, pidgin-perl 2.6.6-5.el5_7.1, libpurple-tcl 2.6.6-5.el5_7.1, libpurple-perl 2.6.6-5.el5_7.1
    fixed: vendor fix RHSA-2011:1371

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.64% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.