SEPTEMBER 17, 2026
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Case File

CVE-2026-66040

HIGH · CVSS 8.8 EPSS 0.52% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-24 · Last synced 2026-08-23

CyberRota Analysis

AI-Generated

FFmpeg versions up to 8.1.2 are vulnerable due to a heap out-of-bounds write in the PNG and APNG encoders, which can be exploited by remote attackers through specially crafted PNG images containing malicious eXIf chunks. This vulnerability can lead to heap memory corruption, process crashes, and potentially arbitrary code execution. Organizations using affected versions of FFmpeg should prioritize patching to mitigate the risk of exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
arbitrary code execution code execution

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-66040
Severity
HIGH
CVSS
8.8
EPSS
0.52%

Original NVD Description

FFmpeg through 8.1.2, fixed in commit b506faf, contains a heap out-of-bounds write vulnerability in the native PNG and APNG encoders that allows remote attackers to corrupt heap memory by supplying a crafted PNG image with a malicious eXIf chunk. Attackers can craft an eXIf chunk where multiple IFD entries reference the same large value payload, causing canonical serialization to expand the output far beyond the undersized allocation estimated by add_exif_profile_size(), resulting in png_write_chunk() writing tens of thousands of bytes past the buffer boundary, leading to deterministic heap corruption, process crash, and potentially arbitrary code execution.

Related CVEs

Other vulnerabilities affecting the same vendor(s)