Unrated

Heap Buffer Overflow in FFmpeg yuv4mpegenc

IdentifiersCVE-2026-39213CWE-122

CVE-2026-39213 is reported as a heap buffer overflow in FFmpeg's yuv4mpegenc component. The provided content identifies the issue only at a high level, stating that it affects yuv4mpegenc and was introduced in 2023. No vulnerable function, code path, trigger condition, or patch details are provided in the available material.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

A successful heap buffer overflow in an FFmpeg encoder component can plausibly lead to process crash, memory corruption, denial of service, and potentially code execution depending on allocator behavior, surrounding memory layout, and exploitability of the overwritten heap objects. However, the specific demonstrated impact for CVE-2026-39213 is not provided in the available content.

Mitigation

If you can’t patch tonight, do this now.

Until patched builds are deployed, reduce exposure by avoiding or restricting workflows that invoke FFmpeg's yuv4mpegenc path on untrusted or attacker-supplied media inputs. Where possible, isolate FFmpeg processing in sandboxed or least-privileged environments and limit access to media conversion pipelines that may exercise this encoder. Specific mitigations beyond general hardening are not available from the provided content.

Remediation

Patch, then assume compromise.

Apply the upstream FFmpeg fix or a vendor/distribution security update that addresses CVE-2026-39213. Because the content states this issue was fixed, administrators should update to a build containing the relevant patch level from upstream FFmpeg or their OS/application vendor. Exact fixed versions are not provided in the available content.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

cyber security newsNews

Jun 9, 2026

21 0-Day Vulnerabilities in FFmpeg Enables Remote Code Execution Attacks

Heap buffer overflow vulnerability in FFmpeg yuv4mpegenc.

the hacker newsNews

Jun 6, 2026

AI Agent Uncovers 21 Zero-Days in FFmpeg; Chrome Patches Record 429 Bugs

One of nine FFmpeg vulnerabilities identified by an autonomous AI agent; the FFmpeg findings are described as mostly heap or stack overflows in parsers and demuxers.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-39213

NVD

nvd.nist.gov/vuln/detail/CVE-2026-39213

MITRE CWE · CWE-122

cwe.mitre.org