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rpcbind rpcinfo CVE-2026-16277

| EUVDEUVD-2026-45950 MEDIUM
Stack-based Buffer Overflow (CWE-121)
2026-07-20 redhat GHSA-mjwp-v273-38g8
Denial Of Service Buffer Overflow Stack Overflow Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Openshift Container Platform 4 Red Hat Suse
6.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

AV:N as rpcinfo queries a remote network server; UI:R required since victim must actively run the command; A:H for client process crash; C:N and I:N as only DoS impact is described.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 20, 2026 - 15:05 vuln.today
CVE Published
Jul 20, 2026 - 14:09 cve.org
MEDIUM 6.5

DescriptionCVE.org

A stack-based buffer overflow was found in rpcbind's rpcinfo utility. When querying a remote rpcbind service with rpcinfo -l, address information returned by the server is copied into a fixed-size buffer without sufficient bounds checking. A malicious or compromised rpcbind server could use this flaw to crash the rpcinfo client, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

AnalysisAI

Stack-based buffer overflow in the rpcinfo client utility (part of the rpcbind package) crashes the client process when querying a malicious or compromised rpcbind server using the -l flag. Address data returned by the server is copied into a fixed-size stack buffer without bounds validation (CWE-121), enabling a server-side attacker to trigger a denial of service against any administrator or script that runs rpcinfo -l against their controlled endpoint. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker stands up malicious rpcbind server
Delivery
Victim runs `rpcinfo -l <server>`
Exploit
Malicious server returns oversized address payload
Execution
rpcinfo copies data into fixed stack buffer
Persist
Stack overflow corrupts rpcinfo process memory
Impact
rpcinfo client crashes (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires a user to actively invoke `rpcinfo` with the `-l` flag specifically - this is the code path that copies server-returned address information into the vulnerable fixed-size buffer; other rpcinfo subcommands are not implicated. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 6.5 Medium (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) accurately reflects a constrained real-world risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has compromised or controls an rpcbind service on a reachable network host configures it to respond to `rpcinfo -l` queries with crafted oversized address strings. When a system administrator or monitoring script runs `rpcinfo -l <attacker-server>` - for example during routine RPC inventory or NFS troubleshooting - the rpcinfo client copies the malicious response data into its fixed stack buffer, overwriting adjacent stack memory and crashing the process. …
Remediation The upstream fix is available as commit bb9bb7286a4c345442946dc2ce3c9e7f67e96d4d in the rpcbind git repository at git.linux-nfs.org (https://git.linux-nfs.org/?p=steved/rpcbind.git;a=commitdiff;h=bb9bb7286a4c345442946dc2ce3c9e7f67e96d4d); however, a released and packaged patched version number has not been confirmed from the available data - monitor Red Hat errata via https://access.redhat.com/security/cve/CVE-2026-16277 for official RHEL 8, 9, 10, and OpenShift 4 package updates and apply them as released. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
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CVE-2026-16277 vulnerability details – vuln.today
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