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CVE-2026-57918: libnfs through 6.0.2 before 935b8db has an xid integer underflow in READ_IOVEC in rpc_read_from_socket in lib/socket.c during a connection to a crafted NFS server, when the expected pdu size exceeds the absolute pdu size from the xid/record-marker.

highCVSS 7.1CVE-2026-57918

CSIRTS triage

vendor: libnfsproduct: libnfsOtheraffected: through 6.0.2 before 935b8db
What
There is an integer underflow vulnerability in the READ_IOVEC function during a connection to a crafted NFS server.
Who is affected
Deployments of libnfs versions through 6.0.2 before commit 935b8db are affected.
Urgency
Remediation is urgent due to the high severity of the vulnerability with a CVSS score of 7.1.
Action
Upgrade to libnfs version 6.0.2 after commit 935b8db.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.1
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-57918

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-57918coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for libnfs

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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