LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, a heap buffer over-read vulnerability exists in libpng's png_write_image_8bit function when processing 8-bit images through the simplified write API with convert_to_8bit enabled. The vulnerability affects 8-bit grayscale+alpha, RGB/RGBA, and images with incomplete row data. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.
総合評価: CVE-2025-64506 は低リスク（25.2/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.12%、2 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.01% | 0.12% | +0.10% |
| 2 | 2025-11-25 | — | 0.01% | — |
EPSS の全履歴 （全 2 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 6.1 | 3.1 | MEDIUM |
|
1.8 | 4.2 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
medium | CVE-2025-64506: 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-2025-64506 |
debian
|
not yet assigned | CVE-2025-64506 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-2025-64506 |
gentoo
|
high | CVE-2025-64506: 1 GLSA(s) (202511-06), 1 atom(s) (media-libs/libpng); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2025-64506 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-64506 |
suse
|
medium | CVE-2025-64506 severity moderate: SUSE including 280 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, …), 774 product×package rows across 315 product lines (Container private-registry/harbor-portal, Container suse/manager/5.0/x86_64/server, … (315 product lines)): Fixed 453, Known Affected 231, Known Not Affected 83, First Fixed 7. | https://www.suse.com/security/cve/CVE-2025-64506/ |
ubuntu
|
medium | CVE-2025-64506 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 13, released 8, DNE 4, needs-triage 4, ignored 1. | https://ubuntu.com/security/CVE-2025-64506 |