CVE-2026-16277 Red Hat CVE debrief

Who should care

System administrators and users of rpcbind's rpcinfo utility should be aware of this vulnerability and take steps to mitigate it. This vulnerability could be used to crash the rpcinfo client, resulting in a denial of service. Affected operators, platforms, and security teams should review and update their vulnerability management processes.

Technical summary

A stack-based buffer overflow was found in rpcbind's rpcinfo utility. When querying a remote rpcbind service with `rpcinfo -l`, address information returned by the server is copied into a fixed-size buffer without sufficient bounds checking. A malicious or compromised rpcbind server could use this flaw to crash the rpcinfo client, resulting in a denial of service. The vulnerability affects system availability.

Defensive priority

Medium

Recommended defensive actions

• Apply patches or updates provided by the vendor to fix the buffer overflow vulnerability
• Use compensating controls such as network segmentation or access controls to limit the attack surface
• Monitor system logs for signs of exploitation
• Consider implementing additional security measures such as intrusion detection or prevention systems
• Review and update asset inventory to identify potentially affected systems
• Track exceptions and retest remediated assets
• Plan and verify vendor-supported updates or mitigations through normal change control

Evidence notes

The CVE record was published on 2026-07-20T15:16:36.720Z and was last modified on 2026-07-21T18:31:51.680Z. The NVD entry is currently Awaiting Analysis. This vulnerability affects rpcbind's rpcinfo utility, allowing a malicious server to crash the rpcinfo client. Evidence is limited, and defenders should verify affected deployments and review vendor guidance.

Sources and 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.