OpenBSD · OpenSSH
CVE-2026-123158
OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability
Cos'è
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.
Cosa fare
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.
Scadenza per le agenzie federali USA: 12 novembre 2026
- Aggiunta all'elenco CISA
- 9 novembre 2026
- Pubblicato
- 5 novembre 2026
- Gravità
- Alta 8,1 CVSS 3.1
- Probabilità di attacchi nei prossimi 30 giorni (EPSS)
- 19% tra il 2,7% più alto di tutte le vulnerabilità note
- Tipo di debolezza
- CWE-394
- Più dettagli
- NVD · CVE.org · CISA
Tutte le fonti (8)
- 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
Altre falle sfruttate di OpenBSD
| Aggiunto | Vulnerabilità | Prodotto | Gravità | Probabilità di attacco |
|---|---|---|---|---|
| 25 mar 2022 | Remote Code Execution | OpenSMTPD | Critica 9,8 | 99% |
Fonti: Known Exploited Vulnerabilities (CISA, pubblico dominio), CVE records (cve.org) e EPSS (FIRST). La probabilità di attacco è la stima EPSS che qualcuno provi a sfruttare la falla nei prossimi 30 giorni.