Crash and information disclosure via unchecked offset addition
Published Apr 12, 2026 · Updated Apr 12, 2026
Integer overflow in Nikon MakerNote handling in the libexif Project's libexif 0.6.25 and earlier allows local users to crash consumers or read data. The exif_mnote_data_olympus_load function adds an untrusted Nikon offset to datao without first checking whether the size_t addition wraps, producing an out-of-bounds read and EXIF misparsing. Exploitation requires a 32-bit build and local delivery of crafted EXIF data; consequences are limited to consumer crashes or information disclosure.
Summary
What happened
Integer overflow in Nikon MakerNote handling in the libexif Project's libexif 0.6.25 and earlier allows local users to crash consumers or read data. The exif_mnote_data_olympus_load function adds an untrusted Nikon offset to datao without first checking whether the size_t addition wraps, producing an out-of-bounds read and EXIF misparsing. Exploitation requires a 32-bit build and local delivery of crafted EXIF data; consequences are limited to consumer crashes or information disclosure.
The record
- CVE
- CVE-2026-40385
- Published
- Apr 12, 2026
- Updated
- Apr 12, 2026
- Vendor
- libexif Project
- Product
- libexif
- Classifications
- CWE-190
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 12, 2026CVE publishedPublication date reported by the CVE source.
- Apr 12, 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=0 <=0.6.25
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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