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CVE-2026-54425high7.5

Apache bRPC: Stack Exhaustion via Recursive HPACK Dynamic Table Size Update Decoding

Impact

Uncontrolled recursion in the HTTP/2 HPACK decoder in Apache bRPC before 1.18.0 allows remote attackers to cause denial of service by sending a crafted HTTP/2 header block containing many consecutive Dynamic Table Size Update entries. Each update was decoded by recursively invoking the HPACK decoder, which could exhaust the thread stack before a header field or end of input was reached.

Source excerpt · apache

What to do

Upgrade bRPC to version 1.18.0, which fixes this issue.

apache guidance

Apply this patch: https://github.com/apache/brpc/pull/3343

Note: The fix changes HPACK Dynamic Table Size Update decoding to use iterative parsing instead of recursive parsing.

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 HTTP/2 HPACK decoder in Apache bRPC before 1.18.0 allows remote attackers to cause denial of service by sending a crafted HTTP/2 header block containing many consecutive Dynamic Table Size Update entries. Each update was decoded by recursively invoking the HPACK decoder, which could exhaust the thread stack before a header field or end of input was reached.

Root Cause: The bRPC HPACK decoder recursively decoded the next entry after processing a Dynamic Table Size Update. The decoder did not bound the recursion depth, so a long sequence of update entries could consume excessive stack space.

Affected Scenarios: Use bRPC with the built-in HTTP/2 implementation to accept HTTP/2 traffic from an untrusted network.

How to Fix:

  1. Upgrade bRPC to version 1.18.0, which fixes this issue.
  2. Apply this patch: https://github.com/apache/brpc/pull/3343

Note: The fix changes HPACK Dynamic Table Size Update decoding to use iterative parsing instead of recursive parsing.

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-2026-54425

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cve.new JSON →

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