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TI-2026-78742 Aliases CVE-2026-78334GHSA-ghj4-cq25-h326

Missing authentication in Apache bRPC streaming RPC frames

Priority MEDIUM 48CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-306.

Summary

Apache bRPC before 1.18.0 on all platforms lacks authentication in its streaming RPC path (CWE-306) when a server is configured with an Authenticator. A remote attacker can bypass server authentication and inject or deliver streaming frames because those frames skip the authentication hook. Streams also bind to the first frame carrying their id, so a foreign socket can impersonate a stream.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

Missing authentication in the streaming RPC path of Apache bRPC (version < 1.18.0) on all platforms allows a remote attacker to bypass server authentication and inject or deliver streaming frames, when a server is configured with an Authenticator. Root Cause: When authentication is configured, streaming RPC frames are consumed directly by the streaming parser (ParseStreamingMessage) and never pass through InputMessenger's authentication hook, so an unauthenticated peer can exchange frames without being authenticated. In addition, a server-accepted stream is bound lazily to the first frame that happens to carry its id, so a stream could accept a frame carrying its id from a socket other than the socket that created the stream. Affected Scenarios: A bRPC server configured with authentication that serves streaming RPC from an untrusted network, or a deployment where a foreign connection can impersonate a stream by id, can be made to accept unauthorized streaming frames. How to Fix: Upgrade bRPC to 1.18.0, which fixes this issue, or apply the patch in PR https://github.com/apache/brpc/pull/3481. Note: The fix rejects streaming frames on server sockets when configured authentication has not completed, and keeps server-accepted streams bound to the socket of their creating RPC and rejects frames arriving from another socket. Authenticated streaming RPC behavior and the wire format are unchanged; only unauthenticated or foreign-socket frames are now rejected.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00663 51st percentileScored 2026-11-07
Fix Fixed Apache bRPC (Apache Software Foundation): 1.18.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache bRPCbefore 1.18.01.18.0Patch availableCNA
  • Apache bRPC VendorApache Affected before 1.18.0 Fixed in 1.18.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:apache:brpc:*:*:*:*:*:*:*:*——Apache
  • cpe:2.3:a:apache:brpc:*:*:*:*:*:*:*:* Versions — — ·Apache

Remediation

Upgrade Apache bRPC to 1.18.0, which fixes this issue, or apply the patch from PR 3481 in the apache/brpc repository.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA Apache bRPC (Apache Software Foundation) Fixed in 1.18.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Apache bRPC — lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb

    35 records Highest priority Priority MEDIUM 18 MEDIUM, 17 LOW

    Other records, highest priority first

    • TI-2026-78552 Out-of-bounds write in Apache bRPC Redis command parserPriority MEDIUM 49
    • TI-2026-78757 Authentication bypass in Apache bRPC servers using internal_portPriority MEDIUM 48
    • TI-2026-78545 Authentication bypass in Apache bRPC via builtin HTTP requestsPriority MEDIUM 48
    Show all 35 records → Advisory →

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-78334
  2. 2026-10-21 Alias added: GHSA-ghj4-cq25-h326
  3. 2026-10-30 CVSS score added · CISA ADP
  4. 2026-10-30 CISA SSVC decision points changed
  5. 2026-10-30 Priority changed: LOW → MEDIUM
  6. 2026-10-31 EPSS moved to the 50th–90th percentile

References

Advisory 1

  • TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
  • TI-2024-30292 Apache OFBiz: Confused controller-view authorization logic (forced browsing) KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-26062 Apache OFBiz: Unauthenticated endpoint could allow execution of screen rendering code KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-21190 Apache OFBiz: Path traversal leading to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-18186 Apache HugeGraph-Server: Command execution in gremlin KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-25106 Deserialization of untrusted data in Apache ActiveMQ KEVCVSS 3.1CRITICAL 10.0
See all 4053 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences