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"cveId": "CVE-2026-82210",
"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
"state": "PUBLISHED",
"assignerShortName": "apache",
"dateReserved": "2026-08-28T08:27:23.061Z",
"datePublished": "2026-10-21T12:01:31.264Z",
"dateUpdated": "2026-10-30T14:25:54.253Z"
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"shortName": "apache",
"dateUpdated": "2026-10-21T12:01:31.264Z"
},
"title": "Apache bRPC: Remote denial of service (crash) via malformed stream feedback frames",
"problemTypes": [
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"descriptions": [
{
"description": "CWE-617 Reachable Assertion",
"lang": "en",
"cweId": "CWE-617",
"type": "CWE"
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"source": {
"discovery": "INTERNAL"
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"affected": [
{
"vendor": "Apache Software Foundation",
"product": "Apache bRPC",
"packageURL": "pkg:github/apache/brpc",
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"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": "Enforceable assertion in the streaming feature of Apache bRPC (version < 1.18.0) on all platforms allows a remote attacker to crash the server process by sending a malformed stream feedback frame.\n\nRoot Cause:\nWhen handling FRAME_TYPE_FEEDBACK frames, bRPC calls Stream::SetRemoteConsumed() which contains CHECK(_cur_buf_size > 0) and unconditionally asserts CHECK(buf.IsEmpty()) on the frame payload. A feedback frame that carries an unexpected payload, or a feedback frame received on a stream where flow control is disabled (cur_buf_size == 0), reaches these assertions. On failure, CHECK failures abort the process, allowing an unauthenticated single client (once a stream is established) to terminate the server and cause a denial of service.\n\nAffected Scenarios:\nUse bRPC server with the streaming control feature (Stream API) served from 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/3494 \n\nThe fix rejects malformed feedback frames with EPROTO and closes only the affected stream instead of crashing the whole process, and it bounds buffer shrinking so cur_buf_size never drops to 0 while flow control is enabled.",
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"value": "Enforceable assertion in the streaming feature of Apache bRPC (version < 1.18.0) on all platforms allows a remote attacker to crash the server process by sending a malformed stream feedback frame.
Root Cause:
When handling FRAME_TYPE_FEEDBACK frames, bRPC calls Stream::SetRemoteConsumed() which contains CHECK(_cur_buf_size > 0) and unconditionally asserts CHECK(buf.IsEmpty()) on the frame payload. A feedback frame that carries an unexpected payload, or a feedback frame received on a stream where flow control is disabled (cur_buf_size == 0), reaches these assertions. On failure, CHECK failures abort the process, allowing an unauthenticated single client (once a stream is established) to terminate the server and cause a denial of service.
Affected Scenarios:
Use bRPC server with the streaming control feature (Stream API) served from 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/3494
The fix rejects malformed feedback frames with EPROTO and closes only the affected stream instead of crashing the whole process, and it bounds buffer shrinking so cur_buf_size never drops to 0 while flow control is enabled."
}
]
}
],
"references": [
{
"url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb",
"tags": [
"vendor-advisory"
]
}
],
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"other": {
"type": "Textual description of severity",
"content": {
"text": "medium"
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"scenarios": [
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"lang": "en",
"value": "GENERAL"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Claude",
"type": "finder"
}
],
"x_generator": {
"engine": "Vulnogram 0.2.0"
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"cvssV3_1": {
"scope": "UNCHANGED",
"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",
"confidentialityImpact": "NONE"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-10-30T14:25:32.031437Z",
"id": "CVE-2026-82210",
"options": [
{
"Exploitation": "none"
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{
"Automatable": "yes"
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{
"Technical Impact": "partial"
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"role": "CISA Coordinator",
"version": "2.0.3"
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"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2026-10-30T14:25:54.253Z"
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