Client crash via unbounded rpcbaddrlist reply formatting
Published Jul 20, 2026 · Updated Jul 20, 2026
Stack-based buffer overflow in rpcinfo on affected Red Hat products allows remote attackers to crash the client via a crafted RPC reply. rpcbaddrlist passes attacker-controlled protocol-family and protocol strings from an RPCBPROC_GETADDRLIST reply to sprintf in a fixed 128-byte stack buffer without a length bound. Exploitation requires a user or administrator to run rpcinfo -l against a malicious or compromised rpcbind endpoint; the established consequence is a crash of that client process.
Summary
What happened
Stack-based buffer overflow in rpcinfo on affected Red Hat products allows remote attackers to crash the client via a crafted RPC reply. rpcbaddrlist passes attacker-controlled protocol-family and protocol strings from an RPCBPROC_GETADDRLIST reply to sprintf in a fixed 128-byte stack buffer without a length bound. Exploitation requires a user or administrator to run rpcinfo -l against a malicious or compromised rpcbind endpoint; the established consequence is a crash of that client process.
The record
- CVE
- CVE-2026-16277
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 10
- Classifications
- CWE-121, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo