CVE-2026-85977Network attack vector

Denial of service via unbounded portmapper reply decoding

Published Oct 16, 2026 · Updated Oct 16, 2026

Resource exhaustion in libtirpc's pmap_getmaps() allows remote attackers to interrupt client applications via crafted portmapper replies. Its xdr_pmaplist decoder processes attacker-supplied PMAPPROC_DUMP list entries without a count limit, consuming memory and CPU. The client must query an attacker-controlled host; the supplied source does not specify whether exhaustion causes a hang or crash.

CVSS severityUnavailable
Unscored
EPSS probability0.28%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in libtirpc's pmap_getmaps() allows remote attackers to interrupt client applications via crafted portmapper replies. Its xdr_pmaplist decoder processes attacker-supplied PMAPPROC_DUMP list entries without a count limit, consuming memory and CPU. The client must query an attacker-controlled host; the supplied source does not specify whether exhaustion causes a hang or crash.

The record

CVE
CVE-2026-85977
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
libuser Project
Product
Red Hat OpenShift Container Platform 4
Classifications
T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

libuser Project · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
libuser Project · Red Hat Hardened ImagesAffected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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