Information disclosure and service interruption via unterminated filename
Published Apr 17, 2026 · Updated Apr 17, 2026
Out-of-bounds read in gPhoto libgphoto2 2.5.33 and earlier allows physically proximate attackers to disclose memory via a Canon USB device. The ptp_unpack_Canon_FE function copies a 13-byte device-supplied filename with strncpy but does not force a terminating null byte, so later string operations read past the buffer. The flaw is reached when an application parses a crafted Canon folder entry from a physically connected device, exposing adjacent memory or interrupting that client.
Summary
What happened
Out-of-bounds read in gPhoto libgphoto2 2.5.33 and earlier allows physically proximate attackers to disclose memory via a Canon USB device. The ptp_unpack_Canon_FE function copies a 13-byte device-supplied filename with strncpy but does not force a terminating null byte, so later string operations read past the buffer. The flaw is reached when an application parses a crafted Canon folder entry from a physically connected device, exposing adjacent memory or interrupting that client.
The record
- CVE
- CVE-2026-40334
- Published
- Apr 17, 2026
- Updated
- Apr 17, 2026
- Vendor
- gPhoto
- Product
- libgphoto2
- Classifications
- CWE-170, 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?
Compare these published version ranges with your installed build and any vendor patches.
- 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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