pnggroup libpng up to 1.6.36 out-of-bounds write

Summaryinfo

A vulnerability, which was classified as critical, has been found in pnggroup libpng up to 1.6.36. The affected element is an unknown function. This manipulation causes out-of-bounds write. This vulnerability is tracked as CVE-2026-33636. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in pnggroup libpng up to 1.6.36. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-33636. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 303835 (Linux Distros Unpatched Vulnerability : CVE-2026-33636), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.6.56 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (303835) and EUVD (EUVD-2026-16269). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Image Processing Software

Vendor

• pnggroup

Name

• libpng

Version

• 1.6.0
• 1.6.1
• 1.6.2
• 1.6.3
• 1.6.4
• 1.6.5
• 1.6.6
• 1.6.7
• 1.6.8
• 1.6.9
• 1.6.10
• 1.6.11
• 1.6.12
• 1.6.13
• 1.6.14
• 1.6.15
• 1.6.16
• 1.6.17
• 1.6.18
• 1.6.19
• 1.6.20
• 1.6.21
• 1.6.22
• 1.6.23
• 1.6.24
• 1.6.25
• 1.6.26
• 1.6.27
• 1.6.28
• 1.6.29
• 1.6.30
• 1.6.31
• 1.6.32
• 1.6.33
• 1.6.34
• 1.6.35
• 1.6.36

License

• open-source

Website

• Product: https://github.com/pnggroup/libpng/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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