Application crash via signed coordinate overflow
Published Jul 14, 2026 · Updated Jul 14, 2026
Heap out-of-bounds write in Pillow before 12.3.0 allows remote attackers to crash applications through attacker-controlled coordinates. The native ImagingPaste path subtracts signed 32-bit box endpoints in int arithmetic; wrapped sizes bypass clipping, and memcpy writes source pixels before the destination row. Exploitation requires an application to pass untrusted crop, paste, or overlay coordinates into the public APIs; the demonstrated consequence is heap corruption and process abort.
Summary
What happened
Heap out-of-bounds write in Pillow before 12.3.0 allows remote attackers to crash applications through attacker-controlled coordinates. The native ImagingPaste path subtracts signed 32-bit box endpoints in int arithmetic; wrapped sizes bypass clipping, and memcpy writes source pixels before the destination row. Exploitation requires an application to pass untrusted crop, paste, or overlay coordinates into the public APIs; the demonstrated consequence is heap corruption and process abort.
The record
- CVE
- CVE-2026-59199
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Pillow
- Product
- Pillow
- Classifications
- CWE-787, CWE-190, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 12.3.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- GHSA-6r8x-57c9-28j4 standalone proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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