CVE-2026-64831
Stack buffer overflow in FFmpeg Vulkan HEVC decoder enabling remote code execution via crafted HEVC stream
Is CVE-2026-64831 being exploited?
Not confirmed. CVE-2026-64831 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 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-64831?
CVE-2026-64831 is rated High with a CVSS score of 8.7. 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-2026-64831?
Yes. A fix has been recorded for CVE-2026-64831. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64831 affect?
CVE-2026-64831 affects FFmpeg 8.0 - 8.1.2, Vulkan HEVC hardware decoder (vk_hevc_end_frame), Apps using FFmpeg hardware HEVC decoding. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64831?
Disable Vulkan HEVC hardware decoding; update FFmpeg to a patched release when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote arbitrary code execution by supplying a crafted HEVC/H.265 bitstream to Vulkan HEVC hw decoder, overwriting return addresses.
Immediate action required
- affected>= 8.0 and <= 8.1.2
- affected92737390dc133daadce47dd7d2ec8ef3d9ebcbed
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.