# CVE-2026-16461: rpcbind rpcinfo stack buffer overflow in rpcbdump

Source: https://junglewise.ai/threats/cve-2026-16461-rpcbind-rpcinfo-stack-buffer-overflow-in-rpcbdump  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-16461 · Severity: medium · CVSS 6.5 · Published 2026-07-21

A security vulnerability exists in the rpcinfo utility, a tool used to query RPC service information on Linux systems. If a user or administrator uses this tool to inspect a malicious or compromised server, the tool may crash or stop responding. This issue primarily affects the reliability of the diagnostic tool when interacting with untrusted network endpoints.

Technologies: [Red Hat Enterprise Linux 10](https://junglewise.ai/threats/technologies/enterprise-linux-10), [Red Hat Enterprise Linux 8](https://junglewise.ai/threats/technologies/enterprise-linux-8), [Red Hat Enterprise Linux 9](https://junglewise.ai/threats/technologies/enterprise-linux-9), [Red Hat OpenShift Container Platform 4](https://junglewise.ai/threats/technologies/openshift-container-platform-4). Vendors: [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-16461 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-16461 being exploited in the wild.

**How severe is CVE-2026-16461?** Medium severity, with a CVSS score of 6.5, published 21 July 2026.

**Which products and versions are affected?** Red Hat rpcbind 1.2.9 and earlier; Red Hat Red Hat Enterprise Linux 8; Red Hat Red Hat Enterprise Linux 9; Red Hat Red Hat Enterprise Linux 10; and 1 more.

**Is there a fix for CVE-2026-16461?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-16461 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-16461?** Check whether you run Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the rpcbdump() function within rpcbind's rpcinfo utility. The vulnerability is caused by the use of unbounded sprintf() calls when formatting version numbers from a remote RPCBPROC_DUMP reply into a fixed 256-byte stack buffer. An attacker can trigger this by hosting a malicious rpcbind endpoint that returns a large number of distinct version strings for a single program. When a victim runs 'rpcinfo -s' against the attacker's host, the buffer is overflown, leading to a crash or denial of service of the client process. As of the advisory date, the issue remains unpatched in upstream rpcbind 1.2.9.

## Affected products

- Red Hat rpcbind 1.2.9 and earlier
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat OpenShift Container Platform 4

## Timeline

- 2026-07-20: disclosed: Reported via Red Hat Bugzilla
- 2026-07-21: advisory: NVD publication date

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-16461](https://access.redhat.com/security/cve/CVE-2026-16461)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2502719](https://bugzilla.redhat.com/show_bug.cgi?id=2502719)

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