EUVD-2026-46185
GHSA-qh7w-564q-qrc7
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Network vector because the malicious server is remote; PR:N because no victim-side privileges are required; UI:R because an admin must actively run rpcinfo -s; A:H for client crash; C and I are N as no data exfiltration or modification occurs.
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
Lifecycle Timeline
2DescriptionCVE.org
A stack-based buffer overflow was found in rpcbind's rpcinfo utility. In rpcbdump() short mode (used by rpcinfo -s), version numbers from a remote RPCBPROC_DUMP reply are written into a fixed-size stack buffer without bounds checking. A user or administrator who runs rpcinfo -s against a malicious or compromised rpcbind endpoint could experience a crash or denial of service of the rpcinfo client.
AnalysisAI
Stack-based buffer overflow in rpcbind's rpcinfo client utility crashes the rpcinfo process when a user or administrator runs rpcinfo -s against a malicious or compromised rpcbind endpoint. The flaw is in the rpcbdump() short-mode function, which writes version number data from a remote RPCBPROC_DUMP reply into a fixed-size stack buffer without bounds validation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concurrent conditions: (1) the attacker must control or have compromised a remote rpcbind endpoint capable of returning a crafted RPCBPROC_DUMP reply with version-number data that exceeds the fixed stack buffer in rpcbdump(); and (2) a user or administrator on the victim system must actively run `rpcinfo -s <attacker-endpoint>` - the vulnerability is not triggered by passive network exposure or inbound connections to the victim. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.5 (Medium) with vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H accurately captures the threat model: the attack is network-reachable but requires active user interaction (UI:R), and the only impact is availability loss (A:H) of the rpcinfo client process itself, not the host or any daemon. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker deploys a rogue rpcbind service on an internet-accessible host (or compromises an existing one) and configures it to return a RPCBPROC_DUMP response containing an abnormally large number of version entries. An administrator troubleshooting RPC connectivity issues runs `rpcinfo -s <attacker-host>`, causing rpcinfo to call rpcbdump() in short mode, overflow the fixed stack buffer with the attacker-supplied version data, and crash. … |
| Remediation | Apply the Red Hat-issued rpcbind package update addressing CVE-2026-16461 via `dnf update rpcbind` on affected RHEL 8, 9, and 10 systems; monitor the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-16461 for the specific fixed package version, which was not independently confirmed in the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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