LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, an out-of-bounds read vulnerability exists in png_image_read_composite when processing palette images with PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly applies background compositing during premultiplication, violating the invariant component ≤ alpha × 257 required by the simplified PNG API. This issue has been patched in version 1.6.51.

photon_os PHSA-2025-5.0-0694: Unknown PhotonOS Security Updated

fedora FEDORA-2025-6af3ed0ae3: libpng-1.6.51-1.fc43

freebsd 4b297f5a-cbad-11f0-ac9f-b42e991fc52e: png -- Multiple vulnerabilities

The remote host is affected by the vulnerability described in GLSA-202511-06 (libpng: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in libpng. Please review the CVE identifiers referenced     below for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, an out-of-bounds read     vulnerability exists in png_image_read_composite when processing palette images with     PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly     applies background compositing during premultiplication, violating the invariant component  alpha  257     required by the simplified PNG API. This issue has been patched in version 1.6.51. (CVE-2025-64720)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of libpng installed on the remote host is prior to 1.6.51. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-327-01 advisory.

    New libpng packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the libpng security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
276918	GLSA-202511-06 : libpng: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
276641	Linux Distros Unpatched Vulnerability : CVE-2025-64720	Nessus	Misc.	high
276587	Slackware Linux 15.0 / current libpng Multiple Vulnerabilities (SSA:2025-327-01)	Nessus	Slackware Local Security Checks	critical

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CVE-2025-64720

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