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"cveId": "CVE-2026-54425",
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"state": "PUBLISHED",
"assignerShortName": "apache",
"dateReserved": "2026-06-14T06:18:42.168Z",
"datePublished": "2026-10-21T11:31:19.989Z",
"dateUpdated": "2026-10-30T13:45:53.356Z"
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"title": "Apache bRPC: Stack Exhaustion via Recursive HPACK Dynamic Table Size Update Decoding",
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"descriptions": [
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"description": "CWE-674 Uncontrolled Recursion",
"lang": "en",
"cweId": "CWE-674",
"type": "CWE"
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"discovery": "EXTERNAL"
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"affected": [
{
"vendor": "Apache Software Foundation",
"product": "Apache bRPC",
"packageURL": "pkg:github/apache/brpc",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "1.18.0",
"versionType": "semver"
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"packageName": "apache/brpc"
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"descriptions": [
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"value": "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.\n\nRoot Cause:\nThe 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.\n\nAffected Scenarios:\nUse bRPC with the built-in HTTP/2 implementation to accept HTTP/2 traffic from an untrusted network.\n\nHow to Fix:\n1. Upgrade bRPC to version 1.18.0, which fixes this issue.\n2. Apply this patch: https://github.com/apache/brpc/pull/3343 \n\nNote:\nThe fix changes HPACK Dynamic Table Size Update decoding to use iterative parsing instead of recursive parsing.",
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"value": "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."
}
]
}
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"references": [
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"url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb",
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"vendor-advisory"
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"value": "GENERAL"
}
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"lang": "en",
"value": "黄宏洋(Huang Hongyang)",
"type": "finder"
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"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
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"content": {
"timestamp": "2026-10-30T13:45:42.813783Z",
"id": "CVE-2026-54425",
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