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Infrastructure

CVE-2026-123158

8.1
High
EPSS n/aPatch available

OpenSSH sshd auth bypass on musl builds allows long-password logins

exploited
Public proof of concept per CISA SSVC; not in CISA KEV
fix
Patch available see the advisory in the references
likelihood
No EPSS score yet
Published 5 Nov 2026Analysed here 6 Nov 2026CVSS scored by the publisher (CNA)
common questions

Is CVE-2026-123158 being exploited?

Not confirmed. CVE-2026-123158 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.

How severe is CVE-2026-123158?

CVE-2026-123158 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-123158?

Yes. A fix has been recorded for CVE-2026-123158. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-123158 affect?

CVE-2026-123158 affects OpenSSH < 10.6p2 (sshd) built with musl libc without PAM, Alpine Linux OpenSSH packages, Containers using musl-based images (e.g., Alpine), Embedded/edge systems compiled with musl and no PAM. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-123158?

Upgrade OpenSSH to 10.6p2+ or apply vendor patches; rebuild musl images with patched OpenSSH.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
OpenSSH < 10.6p2 (sshd) built with musl libc without PAMAlpine Linux OpenSSH packagesContainers using musl-based images (e.g., Alpine)Embedded/edge systems compiled with musl and no PAM
impact

Remote authentication bypass: 256–1024 char passwords authenticate successfully, enabling unauthorized SSH access and lateral movement.

action required

Immediate action required

affected versions
OpenBSD OpenSSH
  • affected< 10.6p2

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

cisa ssvc

exploitation
poc
automatable
no
technical impact
total

Assessed by CISA 5 Nov 2026 (SSVC 2.0.3).

timeline

  1. 5 Nov 2026CISA SSVC assessment: exploitation poc
  2. 5 Nov 2026Published · 1 day later
  3. 6 Nov 2026CVE record last updated · 1 day later
  4. 6 Nov 2026Analysed by vulneraibility.com · same day later
how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
12 references in the CVE record: 1 exploit, 11 links
Show 4 more

sources

  • CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
  • NVD: CVSS and CPE data
  • CISA Vulnrichment (ADP): SSVC decision points
  • FIRST EPSS: exploit probability and percentile
  • Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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