Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N H P N N L L H 8.3 .0095 58.6 —
AFFECTED Product Versions Fixed libpng < 1.6.55 – —
TIMELINE Feb 4 Reserved by GitHub_M Feb 10 Published (CNA: GitHub_M) Aug 11 EXPLOIT PUBLISHED — CVE-2026-25646 (pnggroup libpng). Public exploit reference added.
LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.
| Date | Event | Detail |
|---|---|---|
| February 4, 2026 | Reserved | Reserved by GitHub_M |
| February 10, 2026 | Published | Published (CNA: GitHub_M) |
| August 11, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-25646 (pnggroup libpng). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| pnggroup | libpng | — | < 1.6.55 | — |
Authoritative record: CVE-2026-25646 at cve.org
Vendors: pnggroup
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-25646 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.