Remote crash via signed decompression-size overflow
Published Jan 27, 2026 · Updated Jan 27, 2026
Out-of-bounds write in Cupoch before 0.2.11.0 allows remote attackers to crash tjbench when decompressing oversized images. The decomp function computes the destination-buffer fill length and row offsets with signed int multiplication, which overflows for images above 715,827,882 pixels and drives writes outside the allocated buffer. Reachability requires a consuming application to pass such an image to the bundled tjbench decompression path; the upstream report documents a segfault.
Summary
What happened
Out-of-bounds write in Cupoch before 0.2.11.0 allows remote attackers to crash tjbench when decompressing oversized images. The decomp function computes the destination-buffer fill length and row offsets with signed int multiplication, which overflows for images above 715,827,882 pixels and drives writes outside the allocated buffer. Reachability requires a consuming application to pass such an image to the bundled tjbench decompression path; the upstream report documents a segfault.
The record
- CVE
- CVE-2026-24797
- Published
- Jan 27, 2026
- Updated
- Jan 27, 2026
- Vendor
- neka-nat
- Product
- Cupoch
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 27, 2026CVE publishedPublication date reported by the CVE source.
- Jan 27, 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=0 <v0.2.11.0
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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