Heap-memory disclosure via unchecked 128-bit offset advance
Published Apr 17, 2026 · Updated Apr 17, 2026
Out-of-bounds read in gPhoto libgphoto2 2.5.33 and earlier allows attackers to disclose up to 16 bytes of heap memory via a crafted PTP value. The ptp_unpack_DPV function advances the offset by 16 for UINT128 and INT128 values without first confirming that 16 bytes remain, causing unsigned wraparound in later bounds checks. Exploitation requires a malicious USB device or rogue PTP/IP server to return a property value shorter than 16 bytes.
Summary
What happened
Out-of-bounds read in gPhoto libgphoto2 2.5.33 and earlier allows attackers to disclose up to 16 bytes of heap memory via a crafted PTP value. The ptp_unpack_DPV function advances the offset by 16 for UINT128 and INT128 values without first confirming that 16 bytes remain, causing unsigned wraparound in later bounds checks. Exploitation requires a malicious USB device or rogue PTP/IP server to return a property value shorter than 16 bytes.
The record
- CVE
- CVE-2026-40335
- 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
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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