How severe is CVE-2011-1091?

CVE-2011-1091 has a CVSS 2.0 base score of 4.0, rated medium severity.

Is CVE-2011-1091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1091?

CVE-2011-1091 primarily affects Pidgin. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1091?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-1091 published?

CVE-2011-1091 was published on 2011-03-14 and last updated on 2026-06-16.

CVE-2011-1091

CVE-2011-1091 is a medium-severity vulnerability in Pidgin with a CVSS 2.0 base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 4.0)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Pidgin
Published: 2011-03-14
Last modified: 2026-06-16

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2011-1091?: CVE-2011-1091 has a CVSS 2.0 base score of 4.0, rated medium severity.
Is CVE-2011-1091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1091?: CVE-2011-1091 primarily affects Pidgin. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1091 published?: CVE-2011-1091 was published on 2011-03-14 and last updated on 2026-06-16.

References

Affected products (17)

cpe:2.3:a:pidgin:pidgin:2.6.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.4:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.5:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.6.6:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.1:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.2:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.3:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.4:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.5:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.6:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.7:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.8:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.9:*:*:*:*:*:*:*
cpe:2.3:a:pidgin:pidgin:2.7.10:*:*:*:*:*:*:*

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