libnfs through 6.0.2 before 55c18ea does not validate a string size, leading to an integer overflow during a connection to a crafted NFS server. This occurs in libnfs_zdr_string in lib/libnfs-zdr.c.

opensuse openSUSE-SU-2026:21055-1: openSUSE 16 : Security update for libnfs (Important) (openSUSE-SU-2026:21055-1)

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8464-1 advisory.

    It was discovered that LIBNFS incorrectly handled certain string sizes when connecting to an NFS server.
    An attacker could use this issue to cause LIBNFS to crash, resulting in a denial of service, or possibly     execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of libnfs installed on the remote host is prior to 1.11.0-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3367 advisory.

    libnfs through 6.0.2 before 55c18ea does not validate a string size, leading to an integer overflow during     a connection to a crafted NFS server. This occurs in libnfs_zdr_string in lib/libnfs-zdr.c.
    (CVE-2026-53689)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1855 advisory.

    libnfs through 6.0.2 before 55c18ea does not validate a string size, leading to an integer overflow during     a connection to a crafted NFS server. This occurs in libnfs_zdr_string in lib/libnfs-zdr.c.
    (CVE-2026-53689)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - libnfs through 6.0.2 before 55c18ea does not validate a string size, leading to an integer overflow during     a connection to a crafted NFS server. This occurs in libnfs_zdr_string in lib/libnfs-zdr.c.
    (CVE-2026-53689)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
322482	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : LIBNFS vulnerability (USN-8464-1)	Nessus	Ubuntu Local Security Checks	high
322104	Amazon Linux 2 : libnfs, --advisory ALAS2-2026-3367 (ALAS-2026-3367)	Nessus	Amazon Linux Local Security Checks	high
322054	Amazon Linux 2023 : libnfs, libnfs-devel, libnfs-utils (ALAS2023-2026-1855)	Nessus	Amazon Linux Local Security Checks	high
320496	Linux Distros Unpatched Vulnerability : CVE-2026-53689	Nessus	Misc.	high

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