Vulnerability-Lookup

CVE-2026-78066 (GCVE-0-2026-78066)

Vulnerability from cvelistv5 – Published: 2026-10-21 11:53 – Updated: 2026-10-21 11:53

Title

Apache bRPC: Resource Exhaustion via Unbounded Decompression and Unvalidated Wire-Declared Sizes

Summary

Resource exhaustion in Apache bRPC (version < 1.18.0) on all platforms: multiple parsers that accept wire-controlled input bound no limit on the sizes declared by the client or on decompressed output, which attackers can use to drive disproportionate memory use and crash the process. Root Cause: 1) The gzip/zlib/snappy decompressors enforce no output limit: -max_body_size is checked against the compressed bytes only, so a cap-compliant body (e.g. 64 MiB) can decompress to tens of GiB. 2) The AMF string readers allocate the declared length before the bytes are actually available. 3) RTMP chunk headers may re-declare a message length mid-stream; the declared length was never bounded and the partial reassembly buffer kept growing. 4) The sofa-pbrpc parser does not bound meta_size. 5) mcpack2pb trusts wire-declared item counts for Reserve() and a string value_size of 0 underflows the buffer size, aborting the process. Affected Scenarios: Any bRPC service accepting gzip/zlib/snappy-compressed bodies or rtmp, sofa-pbrpc, or mcpack2pb messages from untrusted clients. How to Fix:(Choose one of the following options) 1. Upgrade bRPC to version 1.18.0, which fixes this issue. 2. Apply this patch: https://github.com/apache/brpc/pull/3476 Note: After the fix, requests whose decompressed size, RTMP message length, or mcpack declared count exceed the new limits are rejected. Operators who legitimately need larger values can raise the corresponding flag (-max_decompressed_body_size, max_body_size).

Severity

No CVSS data available.

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 1088 records in the last 180 days details

References

1 reference

URL	Tags
https://lists.apache.org/thread/2pf15ojj0vr7rtx95…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache bRPC	Affected: 0 , < 1.18.0 (semver)	guessed

Credits

Claude

Show details on NVD website

JSON

To clipboard

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              "value": "Resource exhaustion in Apache bRPC (version \u0026lt; 1.18.0) on all platforms: multiple parsers that accept wire-controlled input bound no limit on the sizes declared by the client or on decompressed output, which attackers can use to drive disproportionate memory use and crash the process.\u003cbr\u003e\u003cbr\u003eRoot Cause:\u003cbr\u003e1) The gzip/zlib/snappy decompressors enforce no output limit: -max_body_size is checked against the compressed bytes only, so a cap-compliant body (e.g.\u0026nbsp;64\u0026nbsp;MiB) can decompress to tens of GiB.\u003cbr\u003e2) The AMF string readers allocate the declared length before the bytes are actually available.\u003cbr\u003e3) RTMP chunk headers may re-declare a message length mid-stream; the declared length was never bounded and the partial reassembly buffer kept growing.\u003cbr\u003e4) The sofa-pbrpc parser does not bound meta_size.\u003cbr\u003e5) mcpack2pb trusts wire-declared item counts for Reserve() and a string value_size of 0 underflows the buffer size, aborting the process.\u003cbr\u003e\u003cbr\u003eAffected Scenarios:\u003cbr\u003eAny bRPC service accepting gzip/zlib/snappy-compressed bodies or rtmp, sofa-pbrpc, or mcpack2pb messages from untrusted clients.\u003cbr\u003e\u003cbr\u003eHow to Fix:\u003cspan\u003e(Choose one of the following options)\u0026nbsp;\u003c/span\u003e\u003cdiv\u003e\u003cspan\u003e1. Upgrade bRPC to version 1.18.0, which fixes this issue.\u003c/span\u003e\u003c/div\u003e\u003cdiv\u003e\u003cspan\u003e2. Apply this patch:\u0026nbsp;\u003c/span\u003ehttps://github.com/apache/brpc/pull/3476\u003cbr\u003e\u003cbr\u003eNote:\u003cbr\u003eAfter the fix, requests whose decompressed size, RTMP message length, or mcpack declared count exceed the new limits are rejected. Operators who legitimately need larger values can raise the corresponding flag (-max_decompressed_body_size, max_body_size).\u003c/div\u003e"
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FKIE_CVE-2026-78066

Vulnerability from fkie_nvd - Published: 2026-10-21 12:17 - Updated: 2026-10-22 16:56

Severity

Summary

References

	URL	Tags
	security@apache.org	https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb

Impacted products

	Vendor	Product	Version

JSON

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": "Resource exhaustion in Apache bRPC (version \u003c 1.18.0) on all platforms: multiple parsers that accept wire-controlled input bound no limit on the sizes declared by the client or on decompressed output, which attackers can use to drive disproportionate memory use and crash the process.\n\nRoot Cause:\n1) The gzip/zlib/snappy decompressors enforce no output limit: -max_body_size is checked against the compressed bytes only, so a cap-compliant body (e.g.\u00a064\u00a0MiB) can decompress to tens of GiB.\n2) The AMF string readers allocate the declared length before the bytes are actually available.\n3) RTMP chunk headers may re-declare a message length mid-stream; the declared length was never bounded and the partial reassembly buffer kept growing.\n4) The sofa-pbrpc parser does not bound meta_size.\n5) mcpack2pb trusts wire-declared item counts for Reserve() and a string value_size of 0 underflows the buffer size, aborting the process.\n\nAffected Scenarios:\nAny bRPC service accepting gzip/zlib/snappy-compressed bodies or rtmp, sofa-pbrpc, or mcpack2pb messages from untrusted clients.\n\nHow to Fix:(Choose one of the following options)\u00a01. Upgrade bRPC to version 1.18.0, which fixes this issue.\n\n2. Apply this patch:\u00a0https://github.com/apache/brpc/pull/3476\n\nNote:\nAfter the fix, requests whose decompressed size, RTMP message length, or mcpack declared count exceed the new limits are rejected. Operators who legitimately need larger values can raise the corresponding flag (-max_decompressed_body_size, max_body_size)."
    }
  ],
  "id": "CVE-2026-78066",
  "lastModified": "2026-10-22T16:56:37.023",
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GHSA-QVXP-6V5R-47H4

Vulnerability from github – Published: 2026-10-21 12:31 – Updated: 2026-10-21 12:31

Details

Root Cause: 1) The gzip/zlib/snappy decompressors enforce no output limit: -max_body_size is checked against the compressed bytes only, so a cap-compliant body (e.g. 64 MiB) can decompress to tens of GiB. 2) The AMF string readers allocate the declared length before the bytes are actually available. 3) RTMP chunk headers may re-declare a message length mid-stream; the declared length was never bounded and the partial reassembly buffer kept growing. 4) The sofa-pbrpc parser does not bound meta_size. 5) mcpack2pb trusts wire-declared item counts for Reserve() and a string value_size of 0 underflows the buffer size, aborting the process.

Affected Scenarios: Any bRPC service accepting gzip/zlib/snappy-compressed bodies or rtmp, sofa-pbrpc, or mcpack2pb messages from untrusted clients.

How to Fix:(Choose one of the following options) 1. Upgrade bRPC to version 1.18.0, which fixes this issue.

Apply this patch: https://github.com/apache/brpc/pull/3476

Note: After the fix, requests whose decompressed size, RTMP message length, or mcpack declared count exceed the new limits are rejected. Operators who legitimately need larger values can raise the corresponding flag (-max_decompressed_body_size, max_body_size).

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-78066"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-21T12:17:23Z",
    "severity": null
  },
  "details": "Resource exhaustion in Apache bRPC (version \u003c 1.18.0) on all platforms: multiple parsers that accept wire-controlled input bound no limit on the sizes declared by the client or on decompressed output, which attackers can use to drive disproportionate memory use and crash the process.\n\nRoot Cause:\n1) The gzip/zlib/snappy decompressors enforce no output limit: -max_body_size is checked against the compressed bytes only, so a cap-compliant body (e.g.\u00a064\u00a0MiB) can decompress to tens of GiB.\n2) The AMF string readers allocate the declared length before the bytes are actually available.\n3) RTMP chunk headers may re-declare a message length mid-stream; the declared length was never bounded and the partial reassembly buffer kept growing.\n4) The sofa-pbrpc parser does not bound meta_size.\n5) mcpack2pb trusts wire-declared item counts for Reserve() and a string value_size of 0 underflows the buffer size, aborting the process.\n\nAffected Scenarios:\nAny bRPC service accepting gzip/zlib/snappy-compressed bodies or rtmp, sofa-pbrpc, or mcpack2pb messages from untrusted clients.\n\nHow to Fix:(Choose one of the following options)\u00a01. Upgrade bRPC to version 1.18.0, which fixes this issue.\n\n2. Apply this patch:\u00a0https://github.com/apache/brpc/pull/3476\n\nNote:\nAfter the fix, requests whose decompressed size, RTMP message length, or mcpack declared count exceed the new limits are rejected. Operators who legitimately need larger values can raise the corresponding flag (-max_decompressed_body_size, max_body_size).",
  "id": "GHSA-qvxp-6v5r-47h4",
  "modified": "2026-10-21T12:31:11Z",
  "published": "2026-10-21T12:31:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-78066"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-78066 (GCVE-0-2026-78066)

FKIE_CVE-2026-78066

GHSA-QVXP-6V5R-47H4

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