CVE-2026-85977
Libtirpc: libtirpc: denial of service via unbounded memory allocation during portmapper response decoding
What happened?
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.
Affected software and versions
| Software | Version information | Fixed version |
|---|---|---|
| libtirpc-mainRed Hat | unaffected: 1.3.8-0.1.hum1 to < * | See vendor advisory |
| libtirpcRed Hat | Default status: affected | See vendor advisory |
| libtirpcRed Hat | Default status: affected | See vendor advisory |
| libtirpcRed Hat | Default status: affected | See vendor advisory |
| libtirpcRed Hat | Default status: affected | See vendor advisory |
| libtirpcRed Hat | Default status: affected | See vendor advisory |
| rhoai/odh-mlflow-rhel9Red Hat | Default status: unaffected | See vendor advisory |
| openshift/ose-rhel-coreos-8Red Hat | Default status: affected | See vendor advisory |
| openshift/ose-rhel-coreos-9Red Hat | Default status: affected | See vendor advisory |
| openshift/ose-rhel-coreos-9Red Hat | Default status: affected | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.