Vulnerability DatabaseCVE-2026-125243
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-125243
Published:November 09, 2026
Updated:November 10, 2026
FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in ff_jpegls_decode_picture() in libavcodec/jpeglsdec.c, which decodes 16-bit line-interleaved JPEG-LS scans as 8-bit samples. Attackers can supply a crafted single-component JPEG-LS image with the ILV byte set to 1, causing decoded GRAY16 frames to expose leftover heap memory.
Related Resources (8)
https://github.com/FFmpeg/FFmpeg/commit/60bc31fcf6543505e6d2fc1a9399cca95f54ba4d
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25303
https://nvd.nist.gov/vuln/detail/CVE-2026-125243
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/125xxx/CVE-2026-125243.json
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/jpeglsdec.c#L483
https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-uninitialized-memory-disclosure-via-jpeg-ls-decoder
https://code.ffmpeg.org/FFmpeg/FFmpeg
https://github.com/FFmpeg/FFmpeg
Do you need more information?
Contact Us
CVSS v4
Base Score:
4.8
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Use of Uninitialized Resource
CWE-908