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OpenAdvisories
High RHSA-2026:61752 4 CVEs

Red Hat Security Advisory: libssh2 security update

Published Sep 1, 2026 · Updated Sep 1, 2026

Ecosystem: Red Hat

Fixed packages 2

ReleasePackageFixed in
Red Hat · RHEL 7 ELS rhel_els:7 libssh2 0:1.8.0-4.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7 libssh2-devel 0:1.8.0-4.el7_9.2

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-2026-66034

    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
  • High 7.3
    CVE-2026-7598

    libssh2 userauth.c userauth_password integer overflow

    A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be lau…

    rust libssh2 libssh2 libssh2 Debian Ubuntu Azure Linux Alpine Wolfi
  • High 7.0
    CVE-2026-58050

    libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation

    libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication ove…

    libssh2 libssh2 rust libssh2 Debian Ubuntu Azure Linux Alpine Wolfi

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2464597
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2493955
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2506857
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2506860
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_61752.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-7598
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-7598
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-7598
  • article
    https://github.com/libssh2/libssh2/
  • article
    https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1
  • article
    https://github.com/libssh2/libssh2/pull/1858
  • article
    https://vuldb.com/submit/805564
  • article
    https://vuldb.com/vuln/360555
  • article
    https://vuldb.com/vuln/360555/cti
  • report
    https://access.redhat.com/security/cve/CVE-2026-58050
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-58050
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-58050
  • 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-integer-overflow-in-publickey-subsystem-attribute-allocation
  • report
    https://access.redhat.com/security/cve/CVE-2026-66032
  • 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://access.redhat.com/security/cve/CVE-2026-66034
  • 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