FKIE_CVE-2026-74758

Vulnerability from fkie_nvd - Published: 2026-10-21 12:17 - Updated: 2026-10-21 12:17
Severity
Summary
A heap use-after-free in the RTMP protocol component of Apache bRPC (versions < 1.18.0) allows a remote attacker to crash a bRPC RTMP server by sending a crafted Abort control message. No authentication or application-level request is required. Root Cause: When an RTMP Abort control message names the chunk stream that is currently being parsed (the chunk stream carrying the message itself), RtmpChunkStream::OnAbortMessage calls RtmpContext::ClearChunkStream, which deletes the RtmpChunkStream while its Feed() is still running. After the message handler returns, Feed() continues to access members of the deleted object, resulting in a heap-use-after-free. Affected Scenarios: bRPC servers that enable RTMP support (ServerOptions.rtmp_service set) and accept connections from untrusted networks. 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/3452 The fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed.
References
security@apache.orghttps://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb
Impacted products
Vendor Product Version
To clipboard 

{
  "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": "A heap use-after-free in the RTMP protocol component of Apache bRPC (versions \u003c 1.18.0) allows a remote attacker to crash a bRPC RTMP server by sending a crafted Abort control message. No authentication or application-level request is required.\n\nRoot Cause:\nWhen an RTMP Abort control message names the chunk stream that is currently being parsed (the chunk stream carrying the message itself), RtmpChunkStream::OnAbortMessage calls RtmpContext::ClearChunkStream, which deletes the RtmpChunkStream while its Feed() is still running. After the message handler returns, Feed() continues to access members of the deleted object, resulting in a heap-use-after-free.\n\nAffected Scenarios:\nbRPC servers that enable RTMP support (ServerOptions.rtmp_service set) and accept connections from untrusted networks.\n\nHow to Fix:\n1. Upgrade bRPC to version 1.18.0, which fixes this issue.\n2. Apply this patch:\u00a0 https://github.com/apache/brpc/pull/3452 \n\nThe fix skips clearing the chunk stream when the Abort message targets the chunk stream that is currently being parsed."
    }
  ],
  "id": "CVE-2026-74758",
  "lastModified": "2026-10-21T12:17:22.863",
  "metrics": {},
  "published": "2026-10-21T12:17:22.863",
  "references": [
    {
      "source": "security@apache.org",
      "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "security@apache.org",
      "type": "Primary"
    }
  ]
}



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