It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1670 advisory.

    Use-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST in libpng before 1.6.57. Passing a pointer     returned by the corresponding getter back into the setter causes the setter to read from a stale pointer     after freeing the internal buffer, leading to corrupted chunk data and potential heap information     disclosure. (CVE-2026-34757)

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

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

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4573 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4573-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                         Tobias Frost     May 09, 2026                                  https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : libpng1.6     Version        : 1.6.37-3+deb11u4     CVE ID         : CVE-2026-34757     Debian Bug     : 1133051

    A security vulnerability has been discovered in libpng, a library     implementing an interface for reading and writing PNG (Portable Network     Graphics) files, which could leading to corrupted chunk data and potential     heap information disclosure.

    For Debian 11 bullseye, this problem has been fixed in version     1.6.37-3+deb11u4.

    We recommend that you upgrade your libpng1.6 packages.

    For the detailed security status of libpng1.6 please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/libpng1.6

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

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

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

The remote SUSE Linux SLES12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1500-1 advisory.

    - CVE-2026-34757: use-after-free in `png_set_PLTE`, `png_set_tRNS` and `png_set_hIST` can lead to     information       disclosure and data corruption (bsc#1261957).
    - CVE-2026-33416: use-after-free via pointer aliasing in `png_set_tRNS` and `png_set_PLTE` can lead to     arbitrary code       execution (bsc#1260754).

Tenable has extracted the preceding description block directly from the SUSE 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 remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8251-1 advisory.

    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)

    It was discovered that libpng incorrectly handled certain setter APIs. An attacker could possibly use this     issue to obtain sensitive information. (CVE-2026-34757)

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

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

According to the versions of the libpng packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.2.1 through 1.6.55, `png_set_tRNS` and `png_set_PLTE`     each alias a heap-allocated buffer between `png_struct` and `png_info`, sharing a single allocation across     two structs with independent lifetimes. The `trans_alpha` aliasing has been present since at least libpng     1.0, and the `palette` aliasing since at least 1.2.1. Both affect all prior release lines `png_set_tRNS`     sets `png_ptr-trans_alpha = info_ptr-trans_alpha` (256-byte buffer) and `png_set_PLTE` sets     `info_ptr-palette = png_ptr-palette` (768-byte buffer). In both cases, calling `png_free_data` (with     `PNG_FREE_TRNS` or `PNG_FREE_PLTE`) frees the buffer through `info_ptr` while the corresponding `png_ptr`     pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to     the freed memory. A second call to `png_set_tRNS` or `png_set_PLTE` has the same effect, because both     functions call `png_free_data` internally before reallocating the `info_ptr` buffer. Version 1.6.56 fixes     the issue.(CVE-2026-33416)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write     exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows     to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels     remain. Because the implementation works backward from the end of the row, the final iteration     dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the     same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG     input if Neon is enabled. Version 1.6.56 fixes the issue.(CVE-2026-33636)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from     png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same     png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the     replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer,     which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata)     or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This     vulnerability is fixed in 1.6.57.(CVE-2026-34757)

Tenable has extracted the preceding description block directly from the EulerOS 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	名称	产品	系列	发布时间	最近更新时间	严重程度
315646	Amazon Linux 2023 : libpng, libpng-devel, libpng-static (ALAS2023-2026-1670)	Nessus	Amazon Linux Local Security Checks	2026/5/20	2026/5/20	medium
313514	Debian dla-4573 : libpng-dev - security update	Nessus	Debian Local Security Checks	2026/5/9	2026/5/14	medium
309168	SUSE SLES12 Security Update : libpng15 (SUSE-SU-2026:1500-1)	Nessus	SuSE Local Security Checks	2026/4/22	2026/5/15	medium
314216	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : libpng vulnerabilities (USN-8251-1)	Nessus	Ubuntu Local Security Checks	2026/5/11	2026/5/14	medium
326114	EulerOS 2.0 SP12 : libpng (EulerOS-SA-2026-2601)	Nessus	Huawei Local Security Checks	2026/7/10	2026/7/10	medium

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