CVE-2026-94640: Rpcbind: unbounded memory allocation in rpcbind statistics tracking allows unauthenticated remote denial of service
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.5%
Up from 0.4% on .
EPSS score, percentile 39.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 7.5 High
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
- Which versions are affected?
Unaffected 0:1.2.7-3.el10_2.1; 0:1.2.5-11.el8_10; 0:1.2.6-7.el9_8.1; 4.22.9.8.202610241758-0
Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
What to do
Workaround (from the CVE record)
Restrict network access to the `rpcbind` service on port 111 to trusted systems. This can be achieved by configuring firewall rules to limit inbound connections. For example, using `firewalld` on Red Hat Enterprise Linux: ```bash # To allow access only from a specific trusted network (e.g., 192.168.1.0/24) firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.1.0/24" port port="111" protocol="tcp" accept' firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="192.168.1.0/24" port port="111" protocol="udp" accept' firewall-cmd --reload ``` If `rpcbind` is only required for local services, ensure it is configured to listen only on the loopback interface or is otherwise protected from external network exposure. Applying these firewall rules will take effect immediately upon `firewall-cmd --reload` and may temporarily interrupt existing connections to `rpcbind`.
Advisories and patches
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Unaffected | 0:1.2.7-3.el10_2.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:1.2.5-11.el8_10 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:1.2.6-7.el9_8.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 4.22.9.8.202610241758-0 |
Versions not listed are: affected.
| Status | Versions |
|---|
Versions not listed are: affected.
| Status | Versions |
|---|
Versions not listed are: affected.
| Status | Versions |
|---|
Versions not listed are: affected.
Versions the record lists as unaffected: 0:1.2.7-3.el10_2.1, 0:1.2.5-11.el8_10, 0:1.2.6-7.el9_8.1, 4.22.9.8.202610241758-0.
Source: CVE List, as of . About the data.
About this vulnerability
A flaw was found in rpcbind. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a large number of unique requests. The rpcbind service records previously unseen RPC (Remote Procedure Call) statistics in unbounded in-memory lists, leading to persistent memory growth and increased CPU usage. This can degrade or exhaust service availability.
Summary: CVE record, as of .
- CISA has not added CVE-2026-94640 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
- The CVE record was published on 22 Sep 2026.
- The CVE record carries a CVSS v3.1 base score of 7.5 (High), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.5% (percentile 39.9), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
- CISA's SSVC assessment in the CVE record: exploitation none, automatable yes, technical impact partial.
- The credits in the CVE record name AISLE as finder.
Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.
Description
Rpcbind: unbounded memory allocation in rpcbind statistics tracking allows unauthenticated remote denial of service
A flaw was found in rpcbind. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a large number of unique requests. The rpcbind service records previously unseen RPC (Remote Procedure Call) statistics in unbounded in-memory lists, leading to persistent memory growth and increased CPU usage. This can degrade or exhaust service availability.
Source: CVE List, as of . About the data.
Weakness
CWE-400
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
2
Known exploited Red Hat vulnerabilities
- CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability
- CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability
- CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability
- CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability
- CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability