LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to version 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_do_quantize function when processing PNG files with malformed palette indices. The vulnerability occurs when palette_lookup array bounds are not validated against externally-supplied image data, allowing an attacker to craft a PNG file with out-of-range palette indices that trigger out-of-bounds memory access. This issue has been patched in version 1.6.51.
Conclusion & alert: CVE-2025-64505 is rated Low Risk (24.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-11-25 | — | 0.01% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.1 | 3.1 | MEDIUM |
|
1.8 | 4.2 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2025-64505: 1 source package rows (libpng); 19 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 4, open 15. | https://security.alpinelinux.org/vuln/CVE-2025-64505 |
debian
|
not yet assigned | CVE-2025-64505 not yet assigned priority: Debian including 1 source packages (libpng1.6), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2025-64505 |
gentoo
|
high | CVE-2025-64505: 1 GLSA(s) (202511-06), 1 atom(s) (media-libs/libpng); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2025-64505 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-64505 |
suse
|
medium | CVE-2025-64505 severity moderate: SUSE including 295 source package names (2.0.4-5.8.229:libpng16-16-1.6.34-150000.3.12.1, 2.1.3-7.76:libpng16-16-1.6.43-slfo.1.1_2.1, …), 868 product×package rows across 310 product lines (Container private-registry/harbor-portal, Container suse/manager/5.0/x86_64/server, … (310 product lines)): Fixed 569, Known Affected 231, Known Not Affected 61, First Fixed 7. | https://www.suse.com/security/cve/CVE-2025-64505/ |
ubuntu
|
medium | CVE-2025-64505 medium priority: Ubuntu including 5 source packages (chromium-browser, firefox, libpng, libpng1.6, thunderbird), 30 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): not-affected 11, released 10, DNE 4, needs-triage 4, ignored 1. | https://ubuntu.com/security/CVE-2025-64505 |