Vulnerability · Published Jun 10, 2026 · Assigned by mitre
CVE-2026-53689
High 7.1
In plain English
A high-severity security flaw in libnfs from sahlberg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.2%top 88.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libnfs | 4.0.0-1+deb12u1 | DEBIAN-CVE-2026-53689 |
| Debian:13 | libnfs | 5.0.2-1+deb13u1 | DEBIAN-CVE-2026-53689 |
| Debian:14 | libnfs | 5.0.2-1.1 | DEBIAN-CVE-2026-53689 |
| Ubuntu:22.04:LTS | libnfs | 4.0.0-1ubuntu0.1 | UBUNTU-CVE-2026-53689 |
| Ubuntu:22.04:LTS | libnfs | 4.0.0-1ubuntu0.1 | USN-8464-1 |
| Ubuntu:24.04:LTS | libnfs | 5.0.2-1ubuntu0.24.04.1 | USN-8464-1 |
| Ubuntu:24.04:LTS | libnfs | 5.0.2-1ubuntu0.24.04.1 | UBUNTU-CVE-2026-53689 |
| Ubuntu:25.10 | libnfs | 5.0.2-1ubuntu0.25.10.1 | USN-8464-1 |
| Ubuntu:25.10 | libnfs | 5.0.2-1ubuntu0.25.10.1 | UBUNTU-CVE-2026-53689 |
| Ubuntu:26.04:LTS | libnfs | 5.0.2-1ubuntu1.1 | USN-8464-1 |
| Ubuntu:26.04:LTS | libnfs | 5.0.2-1ubuntu1.1 | UBUNTU-CVE-2026-53689 |
Affected products (as reported)
Weakness: CWE-1284 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L