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CVE-2026-53689 sahlberg CVE debrief

CVE-2026-53689 is a HIGH severity vulnerability in libnfs through 6.0.2 before 55c18ea. The vulnerability occurs due to an integer overflow during a connection to a crafted NFS server. This happens in libnfs_zdr_string in lib/libnfs-zdr.c. The CVSS score for this vulnerability is 7.1.

Vendor
sahlberg
Product
libnfs
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-07-19
Advisory published
2026-06-10
Advisory updated
2026-07-19

Who should care

Users of libnfs through 6.0.2 before 55c18ea should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by a lack of validation of a string size in libnfs, leading to an integer overflow. This occurs in the libnfs_zdr_string function in lib/libnfs-zdr.c.

Defensive priority

HIGH

Recommended defensive actions

  • Update libnfs to version 6.0.2 or later, or apply patch 55c18ea.

Evidence notes

The CVE record for CVE-2026-53689 was published on 2026-06-10T15:16:42.350Z and last modified on 2026-06-10T20:22:55.220Z. The vulnerability has a CVSS score of 7.1 and is classified as HIGH severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53689 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53689

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53689 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53689

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.