# CVE-2026-79704: Apache bRPC out-of-bounds read in streaming RPC client

Source: https://junglewise.ai/threats/cve-2026-79704-an-out-of-bounds-read-vulnerability-exists-in-the-streaming-rpc  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-21. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

CVE-2026-79704 · Severity: info · Published 2026-10-21

Apache bRPC is a remote procedure call framework used by applications to communicate over networks. A vulnerability in the client code that handles multiple concurrent streams allows a malicious server to crash the client or read sensitive memory contents by sending a specially crafted response. This affects clients connecting to untrusted servers or networks where traffic can be intercepted.

Technologies: [Apache Brpc](https://junglewise.ai/threats/technologies/brpc). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-79704 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-79704 being exploited in the wild.

**How severe is CVE-2026-79704?** Informational severity, published 21 October 2026.

**Which products and versions are affected?** Apache Brpc 1.11.0 through 1.17.0.

**Is there a fix for CVE-2026-79704?** Yes: fixed in bRPC 1.18.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-79704 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-79704?** Check whether you run Apache Brpc at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in bRPC 1.18.0

## Technical details

An out-of-bounds read vulnerability exists in the Controller::HandleStreamConnection path when a bRPC client creates multiple streams in a single RPC. The client fails to validate the size of the extra_stream_ids list returned by the server before indexing into it, allowing a malicious or compromised server (or on-path attacker) to trigger out-of-bounds memory access. This can result in denial of service via client crash or information disclosure through unintended memory leaks.

## Affected products

- Apache bRPC 1.11.0 through 1.17.0

## Timeline

- 2026-10-21: disclosed

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