{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"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": "2026-10-21T11:31:19.989Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-21T11:31:19.989Z"}, "title": "Apache bRPC: Stack Exhaustion via Recursive HPACK Dynamic Table Size Update Decoding", "problemTypes": [{"descriptions": [{"description": "CWE-674 Uncontrolled Recursion", "lang": "en", "cweId": "CWE-674", "type": "CWE"}]}], "source": {"discovery": "EXTERNAL"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache bRPC", "packageURL": "pkg:github/apache/brpc", "versions": [{"status": "affected", "version": "0", "lessThan": "1.18.0", "versionType": "semver"}], "defaultStatus": "unaffected", "collectionURL": "https://github.com", "packageName": "apache/brpc"}], "descriptions": [{"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.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "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.<br><br>Root Cause:<br>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.<br><br>Affected Scenarios:<br>Use bRPC with the built-in HTTP/2 implementation to accept HTTP/2 traffic from an untrusted network.<br><br>How to Fix:<br>1. Upgrade bRPC to version 1.18.0, which fixes this issue.<br>2. Apply this patch: <a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/apache/brpc/pull/3343\">https://github.com/apache/brpc/pull/3343</a><br><br>Note:<br>The fix changes HPACK Dynamic Table Size Update decoding to use iterative parsing instead of recursive parsing."}]}], "references": [{"url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "high"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "\u9ec4\u5b8f\u6d0b(Huang Hongyang)", "type": "finder"}], "x_generator": {"engine": "Vulnogram 0.2.0"}}}}

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{"affected": [{"affectedData": [{"collectionURL": "https://github.com", "defaultStatus": "unaffected", "packageName": "apache/brpc", "packageURL": "pkg:github/apache/brpc", "product": "Apache bRPC", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "1.18.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-54425", "lastModified": "2026-10-21T12:17:21.053", "metrics": {}, "published": "2026-10-21T12:17:21.053", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "security@apache.org", "type": "Primary"}]}

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