LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to version 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-bounds memory access. This issue has been patched in version 1.6.51.

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. Prior to version 1.6.51, a heap buffer over-read vulnerability     exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The     vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image     data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-     bounds memory access. This issue has been patched in version 1.6.51. (CVE-2025-64505)

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
276644	Linux Distros Unpatched Vulnerability : CVE-2025-64505	Nessus	Misc.	medium
276587	Slackware Linux 15.0 / current libpng Multiple Vulnerabilities (SSA:2025-327-01)	Nessus	Slackware Local Security Checks	critical

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CVE-2025-64505

medium

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high

medium

critical