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OpenAdvisories
High RHSA-2026:46955 1 CVE

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Published Jul 28, 2026 · Updated Oct 6, 2026

Ecosystem: Red Hat

Fixed packages 3

ReleasePackageFixed in
Red Hat · Hardened Images 1 hummingbird:1 libssh2 0:1.11.1-10.3.hum1
Red Hat · Hardened Images 1 hummingbird:1 libssh2-devel 0:1.11.1-10.3.hum1
Red Hat · Hardened Images 1 hummingbird:1 libssh2-docs 0:1.11.1-10.3.hum1

Vulnerabilities 1

  • High 7.5
    CVE-2026-66035

    libssh2 Heap Buffer Overflow via ETM Cipher Negotiation

    libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer overflow vulnerability that allows a malicious SSH server to corrupt heap metadata in any connecting client by sending a packet with a packet_length smaller than the ci…

    libssh2 libssh2 rust libssh2 Debian Ubuntu Azure Linux Alpine Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-66035
  • article
    https://access.redhat.com/security/updates/classification/
  • article
    https://images.redhat.com/
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_46955.json
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2506851
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-66035
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-66035
  • article
    https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4
  • article
    https://github.com/libssh2/libssh2/pull/2198
  • article
    https://www.vulncheck.com/advisories/libssh2-heap-buffer-overflow-via-etm-cipher-negotiation