Integer underflow in the png_check_keyword function in pngwutil.c in libpng 0.90 through 0.99, 1.0.x before 1.0.66, 1.1.x and 1.2.x before 1.2.56, 1.3.x and 1.4.x before 1.4.19, and 1.5.x before 1.5.26 allows remote attackers to have unspecified impact via a space character as a keyword in a PNG image, which triggers an out-of-bounds read.
総合評価: CVE-2015-8540 は高リスク（67.8/100）。CVSS 深刻度は高。悪用される可能性が高い（EPSS 13.55%、94 パーセンタイル） 根拠: EPSS 上、短期間での悪用可能性は高い水準です。 推奨対応: 悪用可能性が高いため、影響範囲の確認と修補の優先付けを推奨します。
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 | 2026-02-19 | 13.86% | 13.55% | -0.31% |
| 2 | 2026-02-18 | 13.55% | 13.86% | +0.31% |
| 3 | 2026-01-25 | — | 13.55% | — |
EPSS の全履歴 （全 28 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 |
|---|---|---|---|---|---|---|
| 8.8 | 3.0 | HIGH |
|
2.8 | 5.9 | [email protected] |
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
gentoo
|
normal | CVE-2015-8540: 1 GLSA(s) (201611-08), 1 atom(s) (media-libs/libpng); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-8540 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2015-8540 |
suse
|
low | — | https://www.suse.com/security/cve/CVE-2015-8540/ |
ubuntu
|
medium | CVE-2015-8540 medium priority: Ubuntu including 4 source packages (chromium-browser, firefox, libpng, thunderbird), 20 status rows across 5 suites (precise, trusty, upstream, vivid, wily): not-affected 11, released 4, DNE 3, needs-triage 1, pending 1. | https://ubuntu.com/security/CVE-2015-8540 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| redhat | enterprise_linux_desktop_supplementary | 5.0 | cpe:2.3:o:redhat:enterprise_linux_desktop_supplementary:5.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_desktop_supplementary | 6.0 | cpe:2.3:o:redhat:enterprise_linux_desktop_supplementary:6.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_hpc_node | 6.0 | cpe:2.3:o:redhat:enterprise_linux_hpc_node:6.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server_supplementary | 5.0 | cpe:2.3:o:redhat:enterprise_linux_server_supplementary:5.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server_supplementary | 6.0 | cpe:2.3:o:redhat:enterprise_linux_server_supplementary:6.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_workstation_supplementary | 6.0 | cpe:2.3:o:redhat:enterprise_linux_workstation_supplementary:6.0:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.0 | cpe:2.3:a:libpng:libpng:1.2.0:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.1 | cpe:2.3:a:libpng:libpng:1.2.1:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.2 | cpe:2.3:a:libpng:libpng:1.2.2:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.3 | cpe:2.3:a:libpng:libpng:1.2.3:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.4 | cpe:2.3:a:libpng:libpng:1.2.4:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.5 | cpe:2.3:a:libpng:libpng:1.2.5:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.6 | cpe:2.3:a:libpng:libpng:1.2.6:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.7 | cpe:2.3:a:libpng:libpng:1.2.7:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.8 | cpe:2.3:a:libpng:libpng:1.2.8:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.9 | cpe:2.3:a:libpng:libpng:1.2.9:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.10 | cpe:2.3:a:libpng:libpng:1.2.10:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.11 | cpe:2.3:a:libpng:libpng:1.2.11:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.12 | cpe:2.3:a:libpng:libpng:1.2.12:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.13 | cpe:2.3:a:libpng:libpng:1.2.13:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.14 | cpe:2.3:a:libpng:libpng:1.2.14:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.15 | cpe:2.3:a:libpng:libpng:1.2.15:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.16 | cpe:2.3:a:libpng:libpng:1.2.16:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.17 | cpe:2.3:a:libpng:libpng:1.2.17:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.18 | cpe:2.3:a:libpng:libpng:1.2.18:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.19 | cpe:2.3:a:libpng:libpng:1.2.19:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.20 | cpe:2.3:a:libpng:libpng:1.2.20:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.21 | cpe:2.3:a:libpng:libpng:1.2.21:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.22 | cpe:2.3:a:libpng:libpng:1.2.22:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.23 | cpe:2.3:a:libpng:libpng:1.2.23:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.24 | cpe:2.3:a:libpng:libpng:1.2.24:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.25 | cpe:2.3:a:libpng:libpng:1.2.25:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.26 | cpe:2.3:a:libpng:libpng:1.2.26:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.27 | cpe:2.3:a:libpng:libpng:1.2.27:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.28 | cpe:2.3:a:libpng:libpng:1.2.28:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.29 | cpe:2.3:a:libpng:libpng:1.2.29:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.30 | cpe:2.3:a:libpng:libpng:1.2.30:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.31 | cpe:2.3:a:libpng:libpng:1.2.31:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.32 | cpe:2.3:a:libpng:libpng:1.2.32:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.33 | cpe:2.3:a:libpng:libpng:1.2.33:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.34 | cpe:2.3:a:libpng:libpng:1.2.34:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.35 | cpe:2.3:a:libpng:libpng:1.2.35:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.36 | cpe:2.3:a:libpng:libpng:1.2.36:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.37 | cpe:2.3:a:libpng:libpng:1.2.37:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.38 | cpe:2.3:a:libpng:libpng:1.2.38:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.39 | cpe:2.3:a:libpng:libpng:1.2.39:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.40 | cpe:2.3:a:libpng:libpng:1.2.40:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.41 | cpe:2.3:a:libpng:libpng:1.2.41:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.42 | cpe:2.3:a:libpng:libpng:1.2.42:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.43 | cpe:2.3:a:libpng:libpng:1.2.43:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.43 | cpe:2.3:a:libpng:libpng:1.2.43:devel:*:*:*:*:*:* |
| libpng | libpng | 1.2.44 | cpe:2.3:a:libpng:libpng:1.2.44:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.45 | cpe:2.3:a:libpng:libpng:1.2.45:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.45 | cpe:2.3:a:libpng:libpng:1.2.45:devel:*:*:*:*:*:* |
| libpng | libpng | 1.2.46 | cpe:2.3:a:libpng:libpng:1.2.46:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.46 | cpe:2.3:a:libpng:libpng:1.2.46:devel:*:*:*:*:*:* |
| libpng | libpng | 1.2.47 | cpe:2.3:a:libpng:libpng:1.2.47:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.47 | cpe:2.3:a:libpng:libpng:1.2.47:beta:*:*:*:*:*:* |
| libpng | libpng | 1.2.48 | cpe:2.3:a:libpng:libpng:1.2.48:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.48 | cpe:2.3:a:libpng:libpng:1.2.48:betas:*:*:*:*:*:* |
| libpng | libpng | 1.2.49 | cpe:2.3:a:libpng:libpng:1.2.49:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.50 | cpe:2.3:a:libpng:libpng:1.2.50:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.51 | cpe:2.3:a:libpng:libpng:1.2.51:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.52 | cpe:2.3:a:libpng:libpng:1.2.52:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.53 | cpe:2.3:a:libpng:libpng:1.2.53:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.54 | cpe:2.3:a:libpng:libpng:1.2.54:*:*:*:*:*:*:* |
| libpng | libpng | 1.2.55 | cpe:2.3:a:libpng:libpng:1.2.55:*:*:*:*:*:*:* |
| libpng | libpng | 1.1.1 | cpe:2.3:a:libpng:libpng:1.1.1:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.0 | cpe:2.3:a:libpng:libpng:1.0.0:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.1 | cpe:2.3:a:libpng:libpng:1.0.1:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.2 | cpe:2.3:a:libpng:libpng:1.0.2:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.3 | cpe:2.3:a:libpng:libpng:1.0.3:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.5 | cpe:2.3:a:libpng:libpng:1.0.5:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.6 | cpe:2.3:a:libpng:libpng:1.0.6:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.7 | cpe:2.3:a:libpng:libpng:1.0.7:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.8 | cpe:2.3:a:libpng:libpng:1.0.8:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.9 | cpe:2.3:a:libpng:libpng:1.0.9:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.10 | cpe:2.3:a:libpng:libpng:1.0.10:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.11 | cpe:2.3:a:libpng:libpng:1.0.11:*:*:*:*:*:*:* |
| libpng | libpng | 1.0.12 | cpe:2.3:a:libpng:libpng:1.0.12:*:*:*:*:*:*:* |