---
id: CVE-2026-53689
title: >-
  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
summary: >-
  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.
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L'
cwe:
  - CWE-1284
published: '2026-06-10'
updated: '2026-07-19'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53689'
references:
  - url: >-
      https://github.com/sahlberg/libnfs/commit/55c18ea33a83d667f79f0ef209c96895795c729f
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2026/07/msg00031.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00212
epssPercentile: 0.11803
ingestedAt: '2026-07-19T09:30:44.421Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.