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High RHSA-2026:46927 4 CVEs

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 0:1.11.1-10.2.hum1
Red Hat · Hardened Images 1 hummingbird:1 libssh2-devel 0:1.11.1-10.2.hum1
Red Hat · Hardened Images 1 hummingbird:1 libssh2-docs 0:1.11.1-10.2.hum1

Vulnerabilities 4

  • High 8.8
    CVE-2026-66032

    libssh2 Double-Free Heap Corruption via sftp_open()

    libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open() function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds …

    libssh2 libssh2 libssh2 libssh2 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2026-66033

    libssh2 Integer Underflow DoS via AES-GCM Cipher Negotiation

    libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM cipher…

    libssh2 libssh2 rust libssh2 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.5
    CVE-2026-66034

    libssh2 Heap Out-of-Bounds Read via publickey subsystem

    libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In lib…

    libssh2 libssh2 rust libssh2 Debian Ubuntu Azure Linux Alpine Wolfi
  • Medium 6.5
    CVE-2026-58051

    libssh2 - Free of Uninitialized Pointer in publickey List Cleanup

    libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A ma…

    libssh2 libssh2 rust libssh2 Debian Ubuntu Azure Linux Alpine Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-58051
  • report
    https://access.redhat.com/security/cve/CVE-2026-66032
  • article
    https://access.redhat.com/security/updates/classification/
  • article
    https://images.redhat.com/
  • report
    https://access.redhat.com/security/cve/CVE-2026-66034
  • report
    https://access.redhat.com/security/cve/CVE-2026-66033
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_46927.json
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2493950
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-58051
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-58051
  • article
    https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc
  • article
    https://github.com/libssh2/libssh2/blob/master/src/publickey.c
  • article
    https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2506857
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-66032
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-66032
  • article
    https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0
  • article
    https://github.com/libssh2/libssh2/pull/2180
  • article
    https://www.vulncheck.com/advisories/libssh2-double-free-heap-corruption-via-sftp-open
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2506853
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-66033
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-66033
  • article
    https://github.com/libssh2/libssh2/commit/a2ed82d40964bbc0d64cd717aa0a5a892117d2e6
  • article
    https://github.com/libssh2/libssh2/pull/2401
  • article
    https://www.vulncheck.com/advisories/libssh2-integer-underflow-dos-via-aes-gcm-cipher-negotiation
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2506860
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-66034
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-66034
  • article
    https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99803cd898d9
  • article
    https://github.com/libssh2/libssh2/pull/2202
  • article
    https://www.vulncheck.com/advisories/libssh2-heap-out-of-bounds-read-via-publickey-subsystem