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FFmpeg CVE-2026-64833

| EUVDEUVD-2026-47757 HIGH
Out-of-bounds Read (CWE-125)
2026-07-22 VulnCheck GHSA-34g6-m4cp-w5c9
7.1
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.1 HIGH

Network-delivered crafted stream, no auth (PR:N), but victim must process it through the S/PDIF muxer (UI:R); OOB read yields minor info leak (C:L) and crash (A:H), no integrity impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
6.1 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Red Hat
7.1 HIGH
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 22, 2026 - 18:00 vuln.today
CVE Published
Jul 22, 2026 - 17:03 cve.org
HIGH 7.1

DescriptionCVE.org

FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer that allows attackers to access memory beyond buffer boundaries by supplying a crafted DTS stream with a core_size value larger than the actual packet length. Attackers can exploit the missing bounds check in the spdif_header_dts4 function by providing a malicious DTS-HD audio stream during S/PDIF re-muxing to trigger unauthorized memory reads beyond the packet buffer.

AnalysisAI

Out-of-bounds memory read in FFmpeg's S/PDIF muxer (spdifenc.c) affects versions 0.7.1 through 8.1.2 when re-muxing DTS-HD audio to an S/PDIF (IEC 61937) container. The spdif_header_dts4 function trusts an attacker-controlled core_size field from a crafted DTS stream without validating it against the actual packet length, letting a malicious input read memory past the packet buffer to leak small amounts of adjacent process memory or crash the process. Reported by VulnCheck with an upstream fix available; no public exploit identified at time of analysis and it is not listed in CISA KEV.

Technical ContextAI

FFmpeg is the de-facto multimedia framework used by media players, transcoding pipelines, streaming servers, browsers, and countless embedded devices. The flaw lives in the S/PDIF output muxer (libavformat/spdifenc.c), which wraps compressed audio (here DTS/DTS-HD) into IEC 61937 frames for passthrough over digital audio interfaces. When handling the DTS4 (DTS-HD) sub-stream, spdif_header_dts4 reads a core_size value embedded in the bitstream and uses it to index/copy from the incoming packet buffer. This is a classic CWE-125 (Out-of-bounds Read): a missing sanity check that core_size does not exceed the real packet length allows the muxer to reference bytes beyond the allocated buffer. The affected CPE is cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*, indicating the upstream FFmpeg project itself rather than a single downstream distribution.

RemediationAI

Upstream fix available (PR/commit); released patched version not independently confirmed - apply FFmpeg patch commit 6f80e2765492700622596af720534cef33dd31b4 (pull request 23661) or upgrade to a build that incorporates it once your distribution ships a tagged release beyond 8.1.2. Downstream users should rebuild or update their bundled FFmpeg libavformat and monitor https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-via-s-pdif-muxer-spdifenc-c for a fixed version tag. As a compensating control where patching lags, avoid using the S/PDIF muxer for untrusted input - do not select the 'spdif' output format when transcoding user-supplied media (trade-off: breaks legitimate IEC 61937 passthrough workflows), and validate/reject DTS-HD inputs at ingest. Running conversion in a sandboxed, memory-hardened process (seccomp, ASAN in test, resource limits) further reduces the impact of a crash or leak.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-64833 vulnerability details – vuln.today

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