Pidgin 2.13.0 Denial of Service via Malformed Username

Advisories

Pidgin 2.13.0 Denial of Service via Malformed Username

severity: medium
date: 3/21/2026
Affecting: Pidgin <= 2.13.0
CVE: CVE-2019-25544
CWE: CWE-807 Reliance on Untrusted Inputs in a Security Decision
CVSS: 6.9
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: ExploitDB-46930
Official Product Homepage
Credit: Alejandra Sánchez
Description: Pidgin 2.13.0 contains a denial of service vulnerability that allows local attackers to crash the application by providing an excessively long username string during account creation. Attackers can input a buffer of 1000 characters in the username field and trigger a crash when joining a chat, causing the application to become unavailable.

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