HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and a Segmentation Fault. This issue has been patched in version 12.3.0.
総合評価: CVE-2026-22693 は公開エクスプロイトあり（50/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.38%、29 パーセンタイル） 根拠: 公開エクスプロイトが 3 件参照されています（Exploit-DB）。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
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。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ | |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ | |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 0.05% | 0.38% | +0.33% |
| 2 | 2026-06-08 | 0.07% | 0.05% | -0.02% |
| 3 | 2026-02-21 | — | 0.07% | — |
EPSS の全履歴 （全 6 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 |
|
3.9 | 1.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2026-22693: 1 source package rows (harfbuzz); 19 state rows across 6 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 0, open 19. | https://security.alpinelinux.org/vuln/CVE-2026-22693 |
debian
|
not yet assigned | CVE-2026-22693 not yet assigned priority: Debian including 1 source packages (harfbuzz), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. | https://security-tracker.debian.org/tracker/CVE-2026-22693 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-22693 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2026-22693/ |
ubuntu
|
low | CVE-2026-22693 low priority: Ubuntu including 1 source packages (harfbuzz), 9 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): not-affected 5, needed 2, ignored 1, released 1. | https://ubuntu.com/security/CVE-2026-22693 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| harfbuzz_project | harfbuzz | < 12.3.0 | cpe:2.3:a:harfbuzz_project:harfbuzz:*:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://github.com/harfbuzz/harfbuzz/commit/1265ff8d990284f04d8768f35b0e20ae5f60daae | Patch |
| https://github.com/harfbuzz/harfbuzz/security/advisories/GHSA-xvjr-f2r9-c7ww | Exploit Mitigation Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/01/11/1 | Exploit Mailing List Patch Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2026/01/12/1 | Exploit Mailing List Patch Third Party Advisory |