---
id: "CVE-2026-85977"
kind: "vulnerability"
aliases: ["CVE-2026-85977"]
title: "libtirpc: crafted PMAPPROC_DUMP replies exhaust client memory and CPU"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "libtirpc", "linux", "nfs-clients", "rpc"]
not_affected_if: ["no-pmap-getmaps-use", "trusted-hosts-only"]
published_at: "2026-10-16T19:17:44+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-25T04:26:57+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85977", "first_seen_at": "2026-10-23T21:57:14+00:00"}]
---

# libtirpc: crafted PMAPPROC_DUMP replies exhaust client memory and CPU

libtirpc's pmap_getmaps() decodes PMAPPROC_DUMP replies without a bound, so a malicious server can make the client allocate excessive memory and CPU. The result is a denial of service that crashes or stalls the calling client process.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- `unknown`

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-85977

## From the sources

A flaw was found in libtirpc. A remote attacker can exploit this vulnerability by sending specially crafted PMAPPROC_DUMP replies to a client application that uses the pmap_getmaps() function against an attacker-controlled host. This unbounded decoding can lead to excessive memory and CPU allocation, causing the client process to experience a Denial of Service (DoS) due to resource exhaustion.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_