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Vulnerability record · CVE-2026-34757 · published 9 April 2026

CVE-2026-34757: Libpng use after free vulnerability

LLibpng · Libpng

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.

4.4 CVSS 3.1 Medium EPSS 0.16% · top 95.1% CWE-416 · Use after free
4.4CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pnggroup/libpng/commit/398cbe3df03f4e11bb031e07f416dfdde3684e8a Patch
https://github.com/pnggroup/libpng/commit/55d20aaa322c9274491cda82c5cd4f99b48c6bcc Patch
https://github.com/pnggroup/libpng/issues/836 ExploitIssue TrackingMitigation
https://github.com/pnggroup/libpng/issues/837 ExploitIssue TrackingMitigation
https://github.com/pnggroup/libpng/security/advisories/GHSA-6fr7-g8h7-v645 MitigationPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2026/05/msg00017.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-34757), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.