Vulnerability-Lookup

CVE-2026-56388 (GCVE-0-2026-56388)

Vulnerability from cvelistv5 – Published: 2026-10-21 11:40 – Updated: 2026-10-21 11:40

Title

Apache bRPC: Out-of-Bounds Write in Redis Command Parser

Summary

The Redis server command parser in Apache bRPC accepts an empty RESP array as a command header. A remote unauthenticated attacker who can reach a bRPC server with Redis service enabled can send an empty array header followed by a bulk string, causing an out-of-bounds write in the parser and crashing the process. Root Cause: RedisCommandParser::ConsumeImpl rejected negative RESP array counts but accepted zero. It resized the command argument vector to zero elements and continued parsing. When a following bulk string was parsed, the only index guard was a CHECK. In configurations where fatal logs do not abort immediately, execution could continue and write to _args[0] even though the vector was empty. Affected Scenarios: Deployments that enable ServerOptions.redis_service and accept Redis protocol traffic from untrusted clients. The issue is reached during parsing before command handling or authentication. 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/3354 Note: The fix rejects empty RESP arrays as invalid Redis commands and replaces the internal index CHECK with an explicit parse error so malformed command streams cannot fall through to an indexed vector write.

Severity

No CVSS data available.

CWE

CWE-787 - Out-of-bounds Write
CWE-617 - Reachable Assertion
CWE-252 - Unchecked Return Value

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

Nikko Enggaliano Pratama

Show details on NVD website

JSON

To clipboard

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              "value": "The Redis server command parser in Apache bRPC accepts an empty RESP array as a command header. A remote unauthenticated attacker who can reach a bRPC server with Redis service enabled can send an empty array header followed by a bulk string, causing an out-of-bounds write in the parser and crashing the process.\u003cbr\u003e\u003cbr\u003eRoot Cause:\u003cbr\u003eRedisCommandParser::ConsumeImpl rejected negative RESP array counts but accepted zero. It resized the command argument vector to zero elements and continued parsing. When a following bulk string was parsed, the only index guard was a CHECK. In configurations where fatal logs do not abort immediately, execution could continue and write to _args[0] even though the vector was empty.\u003cbr\u003e\u003cbr\u003eAffected Scenarios:\u003cbr\u003eDeployments that enable ServerOptions.redis_service and accept Redis protocol traffic from untrusted clients. The issue is reached during parsing before command handling or authentication.\u003cbr\u003e\u003cbr\u003eHow to Fix:\u003cbr\u003e1. Upgrade bRPC to version 1.18.0, which fixes this issue.\u003cbr\u003e2. Apply this patch: \u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/apache/brpc/pull/3354\"\u003ehttps://github.com/apache/brpc/pull/3354\u003c/a\u003e\u003cbr\u003e\u003cbr\u003eNote:\u003cbr\u003eThe fix rejects empty RESP arrays as invalid Redis commands and replaces the internal index CHECK with an explicit parse error so malformed command streams cannot fall through to an indexed vector write."
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FKIE_CVE-2026-56388

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": [
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      "lang": "en",
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    }
  ],
  "id": "CVE-2026-56388",
  "lastModified": "2026-10-22T16:56:37.023",
  "metrics": {},
  "published": "2026-10-21T12:17:21.680",
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          "lang": "en",
          "value": "CWE-787"
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      ],
      "source": "security@apache.org",
      "type": "Primary"
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}

GHSA-57W6-4HVP-7M4G

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

Details

Root Cause: RedisCommandParser::ConsumeImpl rejected negative RESP array counts but accepted zero. It resized the command argument vector to zero elements and continued parsing. When a following bulk string was parsed, the only index guard was a CHECK. In configurations where fatal logs do not abort immediately, execution could continue and write to _args[0] even though the vector was empty.

Affected Scenarios: Deployments that enable ServerOptions.redis_service and accept Redis protocol traffic from untrusted clients. The issue is reached during parsing before command handling or authentication.

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/3354

Note: The fix rejects empty RESP arrays as invalid Redis commands and replaces the internal index CHECK with an explicit parse error so malformed command streams cannot fall through to an indexed vector write.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-56388"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-252"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-21T12:17:21Z",
    "severity": null
  },
  "details": "The Redis server command parser in Apache bRPC accepts an empty RESP array as a command header. A remote unauthenticated attacker who can reach a bRPC server with Redis service enabled can send an empty array header followed by a bulk string, causing an out-of-bounds write in the parser and crashing the process.\n\nRoot Cause:\nRedisCommandParser::ConsumeImpl rejected negative RESP array counts but accepted zero. It resized the command argument vector to zero elements and continued parsing. When a following bulk string was parsed, the only index guard was a CHECK. In configurations where fatal logs do not abort immediately, execution could continue and write to _args[0] even though the vector was empty.\n\nAffected Scenarios:\nDeployments that enable ServerOptions.redis_service and accept Redis protocol traffic from untrusted clients. The issue is reached during parsing before command handling or authentication.\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/3354 \n\nNote:\nThe fix rejects empty RESP arrays as invalid Redis commands and replaces the internal index CHECK with an explicit parse error so malformed command streams cannot fall through to an indexed vector write.",
  "id": "GHSA-57w6-4hvp-7m4g",
  "modified": "2026-10-21T12:31:09Z",
  "published": "2026-10-21T12:31:09Z",
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    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56388"
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      "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb"
    }
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.
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Action not permitted

CVE-2026-56388 (GCVE-0-2026-56388)

FKIE_CVE-2026-56388

GHSA-57W6-4HVP-7M4G

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