[UPDATE] [medium] OpenSSH: Multiple vulnerabilities

mediumCVE-2026-55653 CVE-2026-55654 CVE-2026-55655

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

vendor: OpenSSH product: OpenSSH Denial of service Authentication bypass Information disclosureOther

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.

⚡ Watch OpenSSH

Get an email when a new OpenSSH advisory drops — max one per day, one-click unsubscribe.

Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-08
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

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-2026-556530.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all scored CVEs.
Low exploitation riskCVE-2026-556540.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all 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 1% of all 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.

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.

medium[NEW] [medium] OpenSSH: Multiple vulnerabilitiescert-bund · 2026-07-10
medium[UPDATE] [medium] OpenSSH: Multiple vulnerabilitiescert-bund · 2026-07-09
highCVE-2026-47829: Argument Injection in bosh-cli allows a compromised BOSH Director to inject arbitrary OpenSSH …nvd · 2026-07-09
highCVE-2026-60002: ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during…nvd · 2026-07-08
mediumCVE-2026-60001: sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.nvd · 2026-07-08
lowCVE-2026-60000: sshd in OpenSSH before 10.4 allows remote attackers to cause a denial of service (resource con…nvd · 2026-07-08