Heap disclosure via unbounded EOS event reads
Published Apr 17, 2026 · Updated Apr 17, 2026
Out-of-bounds reads in libgphoto2 2.5.33 and earlier allow attackers to disclose adjacent heap memory through crafted EOS events. The ImageFormat and CustomFuncEx parsers receive no buffer length, although their caller has xsize, and consequently read as many as 1,024 bytes without boundary validation. Exploitation requires a malicious USB device or rogue PTP/IP server to return a truncated EOS event response; the reported consequence is adjacent heap-memory disclosure.
Summary
What happened
Out-of-bounds reads in libgphoto2 2.5.33 and earlier allow attackers to disclose adjacent heap memory through crafted EOS events. The ImageFormat and CustomFuncEx parsers receive no buffer length, although their caller has xsize, and consequently read as many as 1,024 bytes without boundary validation. Exploitation requires a malicious USB device or rogue PTP/IP server to return a truncated EOS event response; the reported consequence is adjacent heap-memory disclosure.
The record
- CVE
- CVE-2026-40333
- Published
- Apr 17, 2026
- Updated
- Apr 17, 2026
- Vendor
- gPhoto
- Product
- libgphoto2
- Classifications
- CWE-125, T1200
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 17, 2026CVE publishedPublication date reported by the CVE source.
- Apr 17, 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?
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- Affected versionversion=<= 2.5.33
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
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Your stack
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