CVE-2026-34757
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.
EPSS 0.01% · 0.5th percentile
Risk Scores
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| pnggroup | libpng | >= 1.0.9, < 1.6.57 |
Timeline
- Apr 9, 2026 CVE Published
- Apr 9, 2026 PoC Published
- Apr 10, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
- Apr 16, 2026 Security Advisory
References
- https://github.com/pnggroup/libpng/security/advisories/GHSA-6fr7-g8h7-v645 url
- https://github.com/pnggroup/libpng/issues/836 url
- https://github.com/pnggroup/libpng/issues/837 url
- https://github.com/pnggroup/libpng/commit/398cbe3df03f4e11bb031e07f416dfdde3684e8a url
- https://github.com/pnggroup/libpng/commit/55d20aaa322c9274491cda82c5cd4f99b48c6bcc url
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35611 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26143 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34757 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33103 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32178 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32176 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32167 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32631 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32203 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32184 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20945 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21637 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23653 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33825 advisory
…and 5 more