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CVE-2026-54425

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

CVSS score

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EPSS probability

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Risk score

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Published

4 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

DayBreach AI Explanation

Verified against sources

Apache bRPC HTTP/2 HPACK Stack Exhaustion Vulnerability

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

Uncontrolled recursion in the Apache bRPC HTTP/2 HPACK decoder allows remote attackers to cause a denial of service condition [S0].

Why does it matter?

bRPC instances accepting HTTP/2 traffic from untrusted networks are vulnerable to specially crafted header blocks that exhaust thread stacks [S0].

What should be done?

  • Upgrade bRPC to version 1.18.0 or later [S0]
  • Apply the provided patch [S0]
  • Follow the vendor advisory [S0]
Chain of evidence and sources2 verified claims

Apache bRPC sürüm 1.18.0 öncesindeki HTTP/2 HPACK kod çözücüsünde denetimsiz özyineleme bulunmaktadır.

S0 · daybreach-canonicalS1 · cvelist

Saldırganlar, ardışık Dinamik Tablo Boyutu Güncellemesi girdileri içeren özel HTTP/2 başlık blokları gönderebilir.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

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.

CWE: CWE-674

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-54425 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1Apache Software FoundationApache bRPC View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
The sources have not yet published a verified CVSS metric.

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

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Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-54425 is associated with the following CWEs:

CWE-674: Common Weakness Enumeration Entry CWE-674

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-54425 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Official Sources and Advisories

https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgbvendor-advisory

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

AS
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Apache Software Foundation

Weakness Type (CWE & CAPEC)

CWE-674

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CVE-2026-54425 · Apache bRPC: Stack Exhaustion via Recursive…