CVE-2026-112398
Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
A public proof of concept exists; no exploitation attested.
- Published2026-10-19
- Fixed in13.0.0
- WeaknessCWE-122 · CWE-787
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 FlashPix JPEG-tile decoder can write decoded scanlines beyond the allocated tile buffer. FlashPix (FPX) JPEG decoding selects raw mode LA with two bytes per pixel, while an unrecognized JPEG mode can be decoded as JCS_UNKNOWN with four components, causing ImagingJpegDecode to write four-component scanlines into the two-byte tile buffer. An attacker can supply a crafted OLE2 FlashPix file to an application with the optional olefile dependency installed that opens or thumbnails untrusted input. This can corrupt heap memory and may allow arbitrary code execution. This issue is fixed in version 13.0.0.
Timeline
dates in UTC- 2026-10-1922:17CVE publishedNVD
- 2026-10-2500:27First 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-2026-112398?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-112398?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
- Proof-of-concept repositories
- 1 repository, unverifiedmcpmark-eval-liuhezi/security-advisory-research PoC-in-GitHub
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-122, CWE-787read 2026-10-28
- FIRST EPSSEPSS score0.6 %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-2026-112398?
Is CVE-2026-112398 actively exploited?
What is the CVSS score for CVE-2026-112398?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.