CVEvulnerability
CVE-2026-34757
4.4 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-04-09
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.1 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CVSS 3.1 ([email protected])
- 4.4 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-416
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.
Affected configurations
• libpng libpng (>= 1.0.9 < 1.6.57)
• debian debian linux 11.0
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://github.com/pnggroup/libpng/commit/398cbe3df03f4e11bb031e07f416dfdde3684e8a Patch
- https://github.com/pnggroup/libpng/commit/55d20aaa322c9274491cda82c5cd4f99b48c6bcc Patch
- https://github.com/pnggroup/libpng/issues/836 Exploit, Issue Tracking, Mitigation
- https://github.com/pnggroup/libpng/issues/837 Exploit, Issue Tracking, Mitigation
- https://github.com/pnggroup/libpng/security/advisories/GHSA-6fr7-g8h7-v645 Mitigation, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2026/05/msg00017.html Mailing List, Third Party Advisory