A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
総合評価: CVE-2025-26466 は中リスク（53/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 38.47%、98 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 | 2026-06-15 | 57.36% | 38.47% | -18.89% |
| 2 | 2026-06-11 | 62.37% | 57.36% | -5.00% |
| 3 | 2026-05-08 | — | 62.37% | — |
EPSS の全履歴 （全 45 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 |
|---|---|---|---|---|---|---|
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2025-26466: 1 source package rows (openssh); 6 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 6, open 0. | https://security.alpinelinux.org/vuln/CVE-2025-26466 |
debian
|
unimportant | CVE-2025-26466 unimportant priority: Debian including 1 source packages (openssh), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2025-26466 |
gentoo
|
normal | CVE-2025-26466: 1 GLSA(s) (202502-01), 1 atom(s) (net-misc/openssh); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2025-26466 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-26466 |
suse
|
medium | CVE-2025-26466 severity moderate: SUSE including 84 source package names (15.7.20.5.1:openssh-9.6p1-150600.6.15.2, 15.7.20.5.1:openssh-clients-9.6p1-150600.6.15.2, …), 823 product×package rows across 183 product lines (Container suse/git, Container suse/hpc/warewulf4-x86_64/sle-hpc-node, … (183 product lines)): Fixed 683, Known Not Affected 140. | https://www.suse.com/security/cve/CVE-2025-26466/ |
ubuntu
|
medium | CVE-2025-26466 medium priority: Ubuntu including 2 source packages (openssh, openssh-ssh1), 16 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, trusty, upstream, xenial): not-affected 11, released 3, ignored 1, needs-triage 1. | https://ubuntu.com/security/CVE-2025-26466 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| openbsd | openssh | 9.5 | cpe:2.3:a:openbsd:openssh:9.5:p1:*:*:*:*:*:* |
| openbsd | openssh | 9.6 | cpe:2.3:a:openbsd:openssh:9.6:-:*:*:*:*:*:* |
| openbsd | openssh | 9.6 | cpe:2.3:a:openbsd:openssh:9.6:p1:*:*:*:*:*:* |
| openbsd | openssh | 9.7 | cpe:2.3:a:openbsd:openssh:9.7:-:*:*:*:*:*:* |
| openbsd | openssh | 9.7 | cpe:2.3:a:openbsd:openssh:9.7:p1:*:*:*:*:*:* |
| openbsd | openssh | 9.8 | cpe:2.3:a:openbsd:openssh:9.8:-:*:*:*:*:*:* |
| openbsd | openssh | 9.8 | cpe:2.3:a:openbsd:openssh:9.8:p1:*:*:*:*:*:* |
| openbsd | openssh | 9.9 | cpe:2.3:a:openbsd:openssh:9.9:-:*:*:*:*:*:* |
| openbsd | openssh | 9.9 | cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:* |
| canonical | ubuntu_linux | 24.04 | cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:* |
| canonical | ubuntu_linux | 24.10 | cpe:2.3:o:canonical:ubuntu_linux:24.10:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| debian | debian_linux | 12.0 | cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* |
| debian | debian_linux | 13.0 | cpe:2.3:o:debian:debian_linux:13.0:*:*:*:*:*:*:* |