Medium 5.1Published Apr 9, 2026

CVE-2026-34757LIBPNG has a yse-after-free in png_set_PLTE, png_set_tRNS and png_set_hIST leading to corrupted chunk data and potential heap information disclosure

Updated under an hour ago (Oct 26, 2026, 4:30 PM ET)

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It affects pnggroup libpng and 2 other products. Add what you run to find out whether that includes you.

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Every CVE for pnggroup libpng

Exploited in the last 30 days

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: 5.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

pnggroup libpng pnggroup:libpng (from the name)	from 1.0.9, < 1.6.57	CNA record
libpng libpng libpng:libpng	from 1.0.9 before 1.6.57	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://github.com/pnggroup/libpng/security/advisories/GHSA-6fr7-g8h7-v645	x-refsource-confirm, mitigation, patch, vendor-advisory
https://github.com/pnggroup/libpng/issues/836	x-refsource-misc, exploit, issue-tracking, mitigation
https://github.com/pnggroup/libpng/issues/837	x-refsource-misc, exploit, issue-tracking, mitigation
https://github.com/pnggroup/libpng/commit/398cbe3df03f4e11bb031e07f416dfdde3684e8a	x-refsource-misc, patch
https://github.com/pnggroup/libpng/commit/55d20aaa322c9274491cda82c5cd4f99b48c6bcc	x-refsource-misc, patch
https://lists.debian.org/debian-lts-announce/2026/05/msg00017.html	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.