CVE-2026-82942 Apache Software Foundation CVE debrief

Who should care

Defenders responsible for Apache bRPC servers, especially those serving untrusted clients or with RDMA support enabled, should assess exposure and prioritize verification or remediation efforts.

Why it matters

A race condition vulnerability in Apache bRPC's RDMA transport allows remote clients to cause denial of service attacks. Defenders must verify exposure, especially for servers serving untrusted clients or with RDMA support enabled, and prioritize remediation efforts.

• Remote denial of service attacks are possible against vulnerable Apache bRPC servers.
• Defenders must verify exposure of Apache bRPC servers with RDMA support enabled.
• Server process crashes may occur due to improper synchronization of shared socket input buffers.
• Remediation priority is high for Apache bRPC servers serving untrusted clients.

Technical summary

A data race in the RDMA transport of Apache bRPC (versions < 1.18.0) allows a remote client to crash the server process (denial of service) when RDMA is enabled at build time and runtime. The vulnerability arises from the shared socket input buffer and parser state not being properly synchronized, allowing a remote, unauthenticated client to corrupt the buffer and parser state, leading to a server process crash.

Defensive priority

Defenders should prioritize verifying exposure of Apache bRPC servers with RDMA support enabled, especially those serving untrusted clients, and assess the need for upgrades or compensating controls.

Recommended defensive actions

• Verify Apache bRPC server configurations for RDMA support and ensure proper synchronization of shared socket input buffers.
• Assess exposure of Apache bRPC servers serving untrusted clients and prioritize upgrades or compensating controls.
• Monitor Apache bRPC server logs for potential denial of service attacks.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its root cause, affected scenarios, and references to vendor advisories. The vulnerability is caused by a data race in the RDMA transport of Apache bRPC, which allows a remote client to crash the server process. The issue arises from the shared socket input buffer and parser state not being properly synchronized. The CVE Program record and NIST NVD detail page provide additional information on the vulnerability. Defenders should verify exposure of Apache bR

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.