CVE-2026-73283: In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.
CSIRTS triage
- What
- The restrict keyword in authorized_keys does not properly restrict tunnel forwarding as intended.
- Who is affected
- Systems running OpenSSH versions before 10.5 using restrict keyword for access control.
- Urgency
- Low severity (CVSS 2.5); not exploited; affects only systems relying on restrict for tunnel control.
- Action
- Upgrade OpenSSH to version 10.5 or later to enforce restrict keyword properly.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73283
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-732830.08% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 0% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-73283 | coverage & exploitation status | NVD · CVE.org |
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