CVE-2026-64835 FFmpeg 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder
Attackers can trigger out-of-bounds memory access in FFmpeg's ADX decoder via crafted audio files, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-64835?
CVE-2026-64835 is a high-severity memory corruption vulnerability in Ffmpeg Ffmpeg, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
FFmpeg versions 4.4 through 8.1.2 contain an out-of-bounds memory access vulnerability in the ADX audio decoder within libavcodec/adxdec.c that allows attackers to trigger both out-of-bounds reads and writes by supplying a crafted ADX or AAX audio file with a mid-stream channel layout change. When AV_PKT_DATA_NEW_EXTRADATA side data is received mid-stream, the adx_decode_frame function re-parses the stream header but fails to update the internal channel state, causing subsequent decoding operations to access the prev[] state array using a stale channel count.
Weakness: CWE-787
Which versions are affected by CVE-2026-64835?
It affects 1 product.
Products include Ffmpeg Ffmpeg.
How do I fix CVE-2026-64835?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-64835 being exploited?
There is no known exploitation of CVE-2026-64835 in the wild and no public exploit code.
Other vulnerabilities in Ffmpeg Ffmpeg
Sources
Also known as DEBIAN-CVE-2026-64835, ECHO-8b20-d6e3-e563, GHSA-p2v8-4c4f-rwpq, JLSEC-2026-1177, MINI-gh6x-w3f4-qm2r, UBUNTU-CVE-2026-64835.