UBUNTU-CVE-2026-125177: Medium severity ubuntu/ffmpeg vulnerability
FFmpeg through 9.0.2 contains an information disclosure vulnerability in the MSCC/SRGC decoder in libavcodec/mscc.c that outputs uninitialized heap bytes when RLE data ends early. Attackers can craft an MSCC or SRGC stream, such as in AVI, whose RLE data terminates early so the decoded frame exposes leftover heap memory to viewers of the output.
Affected Software
Event History
Frequently Asked Questions
Who is exposed to this issue?
Systems using Ubuntu's FFmpeg package to decode attacker-controlled MSCC or SRGC media streams are exposed. A crafted stream may be delivered in a container such as AVI, and the disclosure occurs in the decoded frame output.
What must an attacker do to trigger the disclosure?
The attacker must provide a crafted MSCC or SRGC stream whose RLE data terminates early and cause it to be decoded. The affected decoder can then output uninitialized heap bytes as part of the decoded frame.