Vulnerability · Published Oct 16, 2026 · Assigned by redhat
CVE-2026-85977Libtirpc: libtirpc: denial of service via unbounded memory allocation during portmapper response decoding
Medium 5.3
In plain English
A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libtirpc | no fix listed | DEBIAN-CVE-2026-85977 |
| Debian:13 | libtirpc | no fix listed | DEBIAN-CVE-2026-85977 |
| Debian:14 | libtirpc | no fix listed | DEBIAN-CVE-2026-85977 |
| Ubuntu:22.04:LTS | libtirpc | no fix listed | UBUNTU-CVE-2026-85977 |
| Ubuntu:24.04:LTS | libtirpc | no fix listed | UBUNTU-CVE-2026-85977 |
| Ubuntu:26.04:LTS | libtirpc | no fix listed | UBUNTU-CVE-2026-85977 |
| Ubuntu:26.10 | libtirpc | no fix listed | UBUNTU-CVE-2026-85977 |
| Ubuntu:22.04:LTS | ntirpc | no fix listed | UBUNTU-CVE-2026-85977 |
| Ubuntu:24.04:LTS | ntirpc | no fix listed | UBUNTU-CVE-2026-85977 |
| Ubuntu:26.04:LTS | ntirpc | no fix listed | UBUNTU-CVE-2026-85977 |
| Ubuntu:26.10 | ntirpc | no fix listed | UBUNTU-CVE-2026-85977 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-1050 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- RHSA-2026:80360 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-85977 vdb-entry, x_refsource_REDHAT
- RHBZ#2478979 issue-tracking, x_refsource_REDHAT