There exists a use after free/double free in libwebp. An attacker can use the ApplyFiltersAndEncode() function and loop through to free best.bw and assign best = trial pointer. The second loop will then return 0 because of an Out of memory error in VP8 encoder, the pointer is still assigned to trial and the AddressSanitizer will attempt a double free.
総合評価: CVE-2023-1999 は中リスク（41.6/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.95%、57 パーセンタイル） 推奨対応: 影響資産を整理し、修補計画に組み込んでください。
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 | 0.36% | 0.95% | +0.59% |
| 2 | 2026-04-16 | 0.34% | 0.36% | +0.02% |
| 3 | 2026-04-15 | — | 0.34% | — |
EPSS の全履歴 （全 24 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 |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
1.6 | 3.6 | [email protected] |
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-1999: 2 source package rows (firefox-esr, libwebp); 14 state rows across 13 repos (3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 14, open 0. | https://security.alpinelinux.org/vuln/CVE-2023-1999 |
debian
|
not yet assigned | CVE-2023-1999 not yet assigned priority: Debian including 4 source packages (firefox, firefox-esr, libwebp, thunderbird), 16 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 16. | https://security-tracker.debian.org/tracker/CVE-2023-1999 |
gentoo
|
normal | CVE-2023-1999: 3 GLSA(s) (202305-35, 202305-36, 202309-05), 5 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin, media-libs/libwebp, www-client/firefox, www-client/firefox-bin); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-1999 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2023-1999 |
suse
|
high | CVE-2023-1999 severity important: SUSE including 317 source package names (0.3.2-1.2:libwebp7-1.0.3-150200.3.5.1, 0.3.2-1.2:libwebpdemux2-1.0.3-150200.3.5.1, …), 536 product×package rows across 119 product lines (Container containers/lmcache-vllm-openai, Container containers/open-webui, … (119 product lines)): Fixed 305, Known Affected 231. | https://www.suse.com/security/cve/CVE-2023-1999/ |
ubuntu
|
medium | CVE-2023-1999 medium priority: Ubuntu including 8 source packages (firefox, libwebp, …), 104 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 54, ignored 26, released 12, not-affected 9, needs-triage 3. | https://ubuntu.com/security/CVE-2023-1999 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| webmproject | libwebp | >= 0.4.2, < 1.3.1 | cpe:2.3:a:webmproject:libwebp:*:*:*:*:*:*:*:* |