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CVE-2026-55653VulnerabilityPublished Updated

Bundesamt für Sicherheit in der Informationstechnik Fedora · OpenSSH: Mehrere Schwachstellen

Affects Bundesamt für Sicherheit in der Informationstechnik FedoraSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-55653· Medium 4.3

Not known to be exploited · CVSS 4.3 Medium.

Data as of 12 Nov 2026, 12:33 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.14.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Enterprise Linux 10opensshAffected–Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update SupportopensshAffected–Fixed in–
Red Hat Enterprise Linux 8opensshAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportopensshAffected–Fixed in–
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnopensshAffected–Fixed in–
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportopensshAffected–Fixed in–

AI-suggested

Red Hat has released security updates for OpenSSH in Red Hat Enterprise Linux 10 that address these vulnerabilities. Users should apply the updates as described in the Red Hat advisory RHSA-2026:47757. No additional mitigation steps are indicated beyond applying the official patches.

Description

Multiple security vulnerabilities have been identified in OpenSSH as used in Red Hat Enterprise Linux 10. These include a local man-in-the-middle attack on X11 forwarding, a client-side denial of service due to a double free, a heap out-of-bounds read, a use-after-free during host key re-exchange, and a file misplacement issue in scp. Red Hat has released security updates addressing these issues.

References

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