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CVE-2026-54427high7.5

Apache bRPC: Stack Exhaustion via Unbounded Recursion in AMF Parser

Impact

Uncontrolled recursion in the AMF parser in Apache bRPC < 1.18.0 allows a remote RTMP peer to crash a bRPC process by sending deeply nested AMF objects or arrays. The parser recursively processed nested AMF containers without enforcing a depth limit, which could exhaust the native stack.

Source excerpt · apache

What to do

Upgrade Apache bRPC to 1.18.0.

apache guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Apache Software Foundation · apache

Apache bRPC

1 range
apache version evidence

Package identity

pkg:github/apache/brpc

Identity supplied by apache. Version matching requires compatible range evidence.

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affected

0 → before 1.18.0

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

Uncontrolled recursion in the AMF parser in Apache bRPC < 1.18.0 allows a remote RTMP peer to crash a bRPC process by sending deeply nested AMF objects or arrays. The parser recursively processed nested AMF containers without enforcing a depth limit, which could exhaust the native stack.

Affected Scenarios: Applications using bRPC RTMP support and parsing AMF data from an untrusted RTMP peer. This includes RTMP servers parsing client command messages, RTMP clients parsing server responses or status messages, and either side parsing inbound AMF script data such as metadata or cue points. Direct callers of ReadAMFObject or ReadAMFArray on untrusted input are also affected.

How to Fix:

  1. Upgrade Apache bRPC to 1.18.0.
  2. Apply the patch from PR https://github.com/apache/brpc/pull/3344 .

Note: The fix introduces a configurable AMF nesting depth limit with default value 128. AMF objects or arrays deeper than amf_max_depth are rejected after applying the fix.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-54427

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Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-674 ↗

CWE-674 Uncontrolled Recursion

apache

Related →
Contributing organizations · 2
apache

Assigning organization

2026-10-21
CISA-ADP

Additional data publisher

2026-10-30

What changed

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References

1 sources
lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb
vendor-advisoryapache