Ubuntu 25.10 libpng Critical DoS Vulnerabilities USN-8251-1 CVE-2026
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in libpng. Software Description: - libpng1.6: PNG (Portable Network Graphics) file library Details: It was discovered that libpng incorrectly handled memory when processing certain PNG files. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33416) It was discovered that libpng incorrectly handled expanding 8-bit paletted rows to RGB or RGBA on ARM processors. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33636)
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in libpng. Software Description: - libpng1.6: PNG (Portable Network Graphics) file library Details: It was discovered that libpng incorrectly handled memory when processing certain PNG files. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33416) It was discovered that libpng incorrectly handled expanding 8-bit paletted rows to RGB or RGBA on ARM processors. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause libpng to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-33636)
The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 libpng16-16t64 1.6.50-1ubuntu0.5 Ubuntu 24.04 LTS libpng16-16t64 1.6.43-5ubuntu0.6 Ubuntu 22.04 LTS libpng16-16 1.6.37-3ubuntu0.5 In general, a standard system update will make all the necessary changes.
The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 libpng16-16t64 1.6.50-1ubuntu0.5 Ubuntu 24.04 LTS libpng16-16t64 1.6.43-5ubuntu0.6 Ubuntu 22.04 LTS libpng16-16 1.6.37-3ubuntu0.5 In general, a standard system update will make all the necessary changes.
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