libexif up to 0.6.25 Nikon MakerNote integer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in libexif up to 0.6.25. The affected element is an unknown function of the component Nikon MakerNote Handler. Such manipulation leads to integer overflow. This vulnerability is traded as CVE-2026-40385. The attack may be launched remotely. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in libexif up to 0.6.25 and classified as critical. Affected by this issue is some unknown functionality of the component Nikon MakerNote Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In libexif through 0.6.25, an unsigned 32bit integer overflow in Nikon MakerNote handling could be used by local attackers to cause crashes or information leaks. This only affects 32bit systems.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-40385 since 04/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 306056 (Linux Distros Unpatched Vulnerability : CVE-2026-40385), which helps to determine the existence of the flaw in a target environment.

Applying the patch 93003b93e50b3d259bd2227d8775b73a53c35d58 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (306056). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• libexif

Version

• 0.6.0
• 0.6.1
• 0.6.2
• 0.6.3
• 0.6.4
• 0.6.5
• 0.6.6
• 0.6.7
• 0.6.8
• 0.6.9
• 0.6.10
• 0.6.11
• 0.6.12
• 0.6.13
• 0.6.14
• 0.6.15
• 0.6.16
• 0.6.17
• 0.6.18
• 0.6.19
• 0.6.20
• 0.6.21
• 0.6.22
• 0.6.23
• 0.6.24
• 0.6.25

License

• open-source

Website

• Product: https://github.com/libexif/libexif/

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Once again VulDB remains the best source for vulnerability data.

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