CVE-2026-65703
Out-of-bounds write in FFmpeg TDSC decoder via crafted AVI leading to crash or RCE
Is CVE-2026-65703 being exploited?
Not confirmed. CVE-2026-65703 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.19% probability of exploitation in the next 30 days.
How severe is CVE-2026-65703?
CVE-2026-65703 is rated High with a CVSS score of 8.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-65703?
Yes. A fix has been recorded for CVE-2026-65703. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-65703 affect?
CVE-2026-65703 affects FFmpeg 2.7 through 8.1.2, Any application embedding vulnerable FFmpeg builds, Media players/servers using TDSC decoder. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-65703?
Update to vendor-fixed FFmpeg or disable TDSC decoder; block/unpack untrusted AVI files.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Heap out-of-bounds write when parsing crafted AVI TDSF frames, causing process crash and potential remote code execution.
Patch when possible
- affected>= 2.7 and <= 8.1.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.