OpenBSD · OpenSSH
CVE-2026-123158
OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability
概要
sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.
CISA: OpenBSD OpenSSH on Linux contains an unexpected status code or return value vulnerability that could allow for authentication bypass.
対処法
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
米国連邦機関の対応期限:2026年11月12日
- CISAのリストに追加
- 2026年11月9日
- 公開日
- 2026年11月5日
- 深刻度
- 高 8.1 CVSS 3.1
- 今後30日間に攻撃される可能性(EPSS)
- 19% 既知の全脆弱性の上位2.7%
- 脆弱性の種類
- CWE-394
- 詳細
- NVD · CVE.org · CISA
すべての参照(8件)
- https://www.openssh.org/releasenotes.html#10.6p2
- https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482
- https://news.ycombinator.com/item?id=50377976
- https://news.ycombinator.com/item?id=50378228
- https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2
- https://hachyderm.io/@damienmiller/117563026759098135
- https://github.com/predkambrij/sshhole-repro
- https://github.com/leonjza/sshhole-lab
OpenBSDのその他の悪用された脆弱性
| 追加日 | 脆弱性 | 製品 | 深刻度 | 攻撃の可能性 |
|---|---|---|---|---|
| 2022/03/25 | Remote Code Execution | OpenSMTPD | 緊急 9.8 | 99% |
出典:Known Exploited Vulnerabilities(CISA、パブリックドメイン)、CVE records(cve.org)、EPSS(FIRST)。攻撃の可能性は、今後30日以内に誰かがその脆弱性の悪用を試みるというEPSSの推定値です。