CVE-2026-112396
Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer
No exploitation reported by the sources we read.
- Published2026-10-19
- Fixed in13.0.0
- WeaknessCWE-416
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. From 11.3.0 until 13.0.0, Pillow has a heap use-after-free when libtiff rejects a tag while encoding TIFF data to an in-memory buffer. When an application saves attacker-influenced TIFF tags to BytesIO, libtiff can reject a tag during encoding in ImagingLibTiffEncode; the error path then frees the output buffer without closing or clearing the TIFF handle, and later cleanup flushes through the write callback into freed memory, which can crash the process and may enable code execution. This issue is fixed in version 13.0.0.
Timeline
dates in UTC- 2026-10-1922:17CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-112396?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-112396?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 13.0 | ≥ 11.3.0, < 13.0.0 | 13.0.0 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
pillow: pillow: arbitrary code execution via heap use-after-free during TIFF encoding
exploit-intelligence/vulnerability-analysis-rhel9 as a component of Exploit Intelligence · lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · lightspeed-core/rag-tool-cpu-rhel9 as a component of Lightspeed Core · +91 more
Fix
- Update pillow to 13.0.0
- No fix available, says the vendor Red Hat Product Security CVE-2026-112396 · 87 productsFix deferred
- No fix planned, says the vendor Red Hat Product Security CVE-2026-112396 · 7 productsOut of support scope
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2026-10-19
- Last Modified
- 2026-10-20
- NVD status
- Undergoing Analysis
Frequently asked questions
What is CVE-2026-112396?
Is CVE-2026-112396 actively exploited?
What is the CVSS score for CVE-2026-112396?
Running pillow? Hear about its next vulnerability
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.