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CVE-2026-82425 Apache Software Foundation CVE debrief

Apache bRPC versions less than 1.18.0 are vulnerable to a remote denial of service due to a reachable assertion in Socket::OnInputEvent when health checking is enabled. A malicious remote peer can crash the process by deliberately aborting connections and accepting health check probes, triggering the assertion failure. This issue arises when a Socket with health checking enabled fails, and Socket::WaitAndReset closes its file descriptor while the event dispatcher may still be delivering an input event. If the health check then succeeds and revives the Socket, Socket::Address succeeds again while the fd is still -1. In that window, Socket::OnInputEvent hits CHECK(!(events & EPOLLIN)

Vendor
Apache Software Foundation
Product
Apache bRPC
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-21
Original CVE updated
2026-10-30
Advisory published
2026-10-21
Advisory updated
2026-10-30

Who should care

Defenders responsible for applications using Apache bRPC clients with health checks enabled should assess exposure and prioritize upgrading to version 1.18.0 or later. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify exposure, review compensating controls, and plan vendor-supported updates or mitigations.

Why it matters

Defenders should care about CVE-2026-82425 because it allows a remote denial of service in Apache bRPC versions less than 1.18.0 when health checking is enabled. This vulnerability can be exploited by a malicious remote peer, potentially disrupting service availability. Defenders responsible for applications using bRPC clients with health checks enabled should assess exposure and prioritize upgrading to version 1.18.0 or later.

  • Remote denial of service via process crash
  • Potential disruption to service availability
  • Need for verification of exposure in applications using bRPC clients with health checks enabled
  • Priority on upgrading to version 1.18.0 or later

Technical summary

The vulnerability is caused by a reachable assertion in Socket::OnInputEvent when health checking is enabled in Apache bRPC versions less than 1.18.0. This allows a malicious remote peer to crash the process, resulting in a denial of service. The assertion failure occurs due to a race condition between connection teardown and health check revival, where Socket::OnInputEvent hits CHECK(!(events & EPOLLIN)) because the Socket is addressable but has no fd. Defenders should prioritize verifying exposure in applications using bRPC clients with health checks enabled and upgrading to version 1.18.0 or later.

Defensive priority

Defenders should prioritize verifying exposure in applications using bRPC clients with health checks enabled and upgrading to version 1.18.0 or later.

Recommended defensive actions

  • Verify if applications using bRPC clients have health checks enabled
  • Upgrade to Apache bRPC version 1.18.0 or later
  • Monitor for potential denial of service attempts
  • Review and adjust health check configurations as needed
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

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 reachable assertion in Socket::OnInputEvent when health checking is enabled in Apache bRPC versions less than 1.18.0. This allows a malicious remote peer to crash the process, resulting in a denial of service. The assertion failure occurs due to a race condition between connection teardown and health check revival. Defenders should verify exposure in b

Sources and references

Verified primary and authoritative sources

  • CVE-2026-82425 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-82425

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-82425 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-82425

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.