[UPDATE] [medium] OpenSSH: Multiple vulnerabilities
An attacker can exploit multiple vulnerabilities in OpenSSH to conduct a denial of service attack, bypass security measures, manipulate data, or disclose confidential information.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited to conduct a denial of service attack, bypass security measures, manipulate data, or disclose confidential information.
- Who is affected
- Deployments of OpenSSH are affected.
- Urgency
- Remediation is medium urgency as exploitation is possible but not currently active.
- Action
- Update to the latest version of OpenSSH.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2039
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-2026-556530.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-556540.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 36% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-556550.09% 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-2026-55653 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-55654 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-55655 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedMultiples vulnérabilités dans les produits IBM (28 août 2026)cert-fr-avis
- mediumCVE-2026-55653: Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during…msrc
- mediumCVE-2026-55655: Openssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat enterpri…msrc
Recent advisories for OpenSSH
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [hoch] OpenSSH: Mehrere Schwachstellencert-bund · 2026-09-14
- medium[UPDATE] [mittel] OpenSSH: Mehrere Schwachstellencert-bund · 2026-09-11
- highCVE-2026-69397: Use after free in OpenSSH for Windows allows an unauthorized attacker to execute code over a n…nvd · 2026-09-08
- highCVE-2026-69397: Microsoft OpenSSH for Windows Remote Code Execution Vulnerabilitymsrc · 2026-09-08
- unknownUSN-8721-1: OpenSSH vulnerabilitiesubuntu · 2026-09-03
- low[UPDATE] [low] OpenSSH: Multiple vulnerabilities allow code executioncert-bund · 2026-09-02
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