How severe is CVE-2026-53689?

CVE-2026-53689 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-53689 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53689?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-53689 have an EU (EUVD) identifier?

Yes. CVE-2026-53689 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36027.

When was CVE-2026-53689 published?

CVE-2026-53689 was published on 2026-06-10 and last updated on 2026-06-17.

CVE-2026-53689

CVE-2026-53689 is a high-severity vulnerability with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36027
Weakness: CWE-1284
Published: 2026-06-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-53689?: 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.
How severe is CVE-2026-53689?: CVE-2026-53689 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-53689 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-53689?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-53689 have an EU (EUVD) identifier?: Yes. CVE-2026-53689 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36027.
When was CVE-2026-53689 published?: CVE-2026-53689 was published on 2026-06-10 and last updated on 2026-06-17.

References

https://github.com/sahlberg/libnfs/commit/55c18ea33a83d667f79f0ef209c96895795c729f

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