Description
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.
Published: 2026-10-16
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

Vendor Workaround

To mitigate this issue, avoid configuring applications that use `pmap_getmaps()` to query untrusted or attacker-controlled portmapper services. If such functionality is essential, restrict network access for services utilizing `pmap_getmaps()` to only trusted hosts via firewall rules. Additionally, consider isolating client applications that call `pmap_getmaps()` into constrained environments to limit the impact of potential resource exhaustion.

Tracking

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Advisories

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History

Wed, 21 Oct 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Libtirpc Project
Libtirpc Project libtirpc
Redhat hardened Images
Redhat openshift Container Platform
Vendors & Products Libtirpc Project
Libtirpc Project libtirpc
Redhat hardened Images
Redhat openshift Container Platform

Mon, 19 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 17 Oct 2026 21:00:00 +0000

Type Values Removed Values Added
References

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 16 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Libtirpc: libtirpc: denial of service via unbounded memory allocation during portmapper response decoding
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
Weaknesses CWE-1050
CPEs cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H'}


Subscriptions

Libtirpc Project Libtirpc
Redhat Enterprise Linux Hardened Images Hummingbird Openshift Openshift Container Platform
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-19T14:21:52.857Z

Reserved: 2026-09-04T18:43:38.572Z

Link: CVE-2026-85977

cve-icon Vulnrichment

Updated: 2026-10-19T14:21:21.576Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-16T19:17:44.430

Modified: 2026-10-19T15:17:08.467

Link: CVE-2026-85977

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-16T15:03:06Z

Links: CVE-2026-85977 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-21T20:22:14Z

Weaknesses