Memory corruption via wrapped PNM dimensions
Published May 4, 2026 · Updated May 4, 2026
Integer overflow in GREYC CImg before commit 4ca26bc allows attackers to corrupt memory by loading a crafted PNM image. The _load_pnm() file-size guard multiplies attacker-controlled width, height, and depth before widening the result to 64 bits, so overflow can make an undersized allocation appear valid. Exploitation requires an application to load an untrusted PNM, PGM, or PPM file and can corrupt heap memory or interrupt that process.
Summary
What happened
Integer overflow in GREYC CImg before commit 4ca26bc allows attackers to corrupt memory by loading a crafted PNM image. The _load_pnm() file-size guard multiplies attacker-controlled width, height, and depth before widening the result to 64 bits, so overflow can make an undersized allocation appear valid. Exploitation requires an application to load an untrusted PNM, PGM, or PPM file and can corrupt heap memory or interrupt that process.
The record
- CVE
- CVE-2026-42144
- Published
- May 4, 2026
- Updated
- May 4, 2026
- Vendor
- GREYC
- Product
- CImg
- Classifications
- CWE-190
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 4, 2026CVE publishedPublication date reported by the CVE source.
- May 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=< 4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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