A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.
総合評価: CVE-2026-3591 は低リスク（22.1/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.01%、1 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 | 2026-03-26 | — | 0.01% | — |
EPSS の全履歴 （全 1 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 |
|---|---|---|---|---|---|---|
| 5.4 | 3.1 | MEDIUM |
|
2.8 | 2.5 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2026-3591: 1 source package rows (bind); 3 state rows across 3 repos (3.22-main, 3.23-main, edge-main); fixed 3, open 0. | https://security.alpinelinux.org/vuln/CVE-2026-3591 |
debian
|
unimportant | CVE-2026-3591 unimportant priority: Debian including 1 source packages (bind9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2026-3591 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-3591 |
suse
|
medium | CVE-2026-3591 severity moderate: SUSE including 51 source package names (bind, bind-9.20.21-1.1, …), 161 product×package rows across 25 product lines (SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS, … (25 product lines)): Known Not Affected 141, Fixed 12, First Fixed 8. | https://www.suse.com/security/cve/CVE-2026-3591/ |
ubuntu
|
medium | CVE-2026-3591 medium priority: Ubuntu including 3 source packages (bind9, bind9-libs, isc-dhcp), 21 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): not-affected 10, needs-triage 7, DNE 2, released 2. | https://ubuntu.com/security/CVE-2026-3591 |
| URL | タグ |
|---|---|
| https://downloads.isc.org/isc/bind9/9.20.21 | Patch |
| https://downloads.isc.org/isc/bind9/9.21.20 | Patch |
| https://kb.isc.org/docs/cve-2026-3591 | Vendor Advisory |