CVE-2026-112403
Pillow: Heap buffer overflow in ImagingJpegDecode
A public proof of concept exists; no exploitation attested.
- Published2026-10-19
- Fixed in13.0.0
- WeaknessCWE-122
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Pillow is a Python imaging library. Prior to 13.0.0, Pillow's JPEG decoder can write a full-width scanline into a buffer sized for a requested draft scale. ImagingJpegDecode does not verify libjpeg's actual output width and component count after scaling is requested, and an 8-bit lossless SOF3 JPEG decoded by a build linked to libjpeg-turbo 3.x can ignore the requested downscaling geometry. An attacker can supply such a JPEG to an application that uses draft() or thumbnail() to request downscaling. This can corrupt heap memory, crash the process, or potentially allow code execution. Older libjpeg-turbo 2.x and IJG builds reject the SOF3 input. This issue is fixed in version 13.0.0.
Timeline
dates in UTC- 2026-10-1922:17CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-28 09:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-112403?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-112403?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 13.0 | < 13.0.0 | 13.0.0 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Python pillow to 13.0.0
Advisories and patches
- github.comPatch
- github.comRelease Notes
- github.comVendor Advisory
Detection
read 2026-10-28 00:45 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- CISA-ADPSSVC decisionpoc2026-10-22
- OpenCVESSVC decisionpoc—
- CNACVSS 4.09.2read 2026-10-28
- NVDCVSS 3.19.8read 2026-10-28
- CNAweakness (CWE)CWE-122read 2026-10-28
- FIRST EPSSEPSS score0.8 %2026-10-26
- PoC-in-GitHubproof of concept1read 2026-10-28
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/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
- Published
- 2026-10-19
- Last Modified
- 2026-10-27
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-112403?
Is CVE-2026-112403 actively exploited?
What is the CVSS score for CVE-2026-112403?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.