Is CVE-2026-53689 in the CISA KEV catalog?

No. CVE-2026-53689 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-53689?

CVE-2026-53689 has a CVSS v3 base score of 7.1 (Moderate).

What is the EPSS score for CVE-2026-53689?

CVE-2026-53689 has an EPSS score of 0.19% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53689?

Upgrade libnfs on ubuntu 22.04 to 4.0.0-1ubuntu0.1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2026-53689

MEDIUM

7.1

CVSS v3

NVD

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.

CWE-1284

How to fix

Remediation Available

libnfsUbuntu

Fixed in:4.0.0-1ubuntu0.1USN-8464-1

Fixed in:5.0.2-1ubuntu0.24.04.1USN-8464-1

Fixed in:5.0.2-1ubuntu0.25.10.1USN-8464-1

libnfs-utilsUbuntu

Fixed in:4.0.0-1ubuntu0.1USN-8464-1

Fixed in:5.0.2-1ubuntu0.24.04.1USN-8464-1

Fixed in:5.0.2-1ubuntu0.25.10.1USN-8464-1

libnfs13Ubuntu

Fixed in:4.0.0-1ubuntu0.1USN-8464-1

libnfs14Ubuntu

Fixed in:5.0.2-1ubuntu0.24.04.1USN-8464-1

Fixed in:5.0.2-1ubuntu0.25.10.1USN-8464-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L/E:U

Exploit Intelligence

0.19%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Other references1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-10.