{
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    "cveMetadata": {
        "cveId": "CVE-2026-87849",
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "state": "PUBLISHED",
        "assignerShortName": "apache",
        "dateReserved": "2026-09-09T12:24:36.838Z",
        "datePublished": "2026-10-21T12:18:29.706Z",
        "dateUpdated": "2026-10-26T13:54:40.137Z"
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                "dateUpdated": "2026-10-21T12:18:29.706Z"
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            "title": "Apache bRPC: Out-of-bounds read via non-object fields in Discovery naming-service reply parsing",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "description": "CWE-125 Out-of-bounds Read",
                            "lang": "en",
                            "cweId": "CWE-125",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "source": {
                "discovery": "INTERNAL"
            },
            "affected": [
                {
                    "vendor": "Apache Software Foundation",
                    "product": "Apache bRPC",
                    "packageURL": "pkg:github/apache/brpc",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "1.18.0",
                            "versionType": "semver"
                        }
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                    "packageName": "apache/brpc"
                }
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            "descriptions": [
                {
                    "value": "The Discovery naming-service reply parser in Apache bRPC (versions < 1.18.0) calls RapidJSON object-only accessors (FindMember) on JSON values without first validating that those values are objects. A malformed Discovery response whose data/service members or instances list contain non-object entries (e.g. a bare integer) triggers the RapidJSON object-access precondition on the client, reading memory out of bounds and potentially crashing the bRPC client.\n\nRoot Cause:\nIn src/brpc/policy/discovery_naming_service.cpp, DiscoveryNamingService::GetServers() and DiscoveryNames::ListDiscoveryNodes() access JSON values with member functions on non-object values. RapidJSON only defines these operations for object types; invoking them on a non-object violates the class invariant and results in undefined behavior (out-of-bounds read), commonly crashing the process.\n\nAffected Scenarios: \nAn operator-configured (or compromised) Discovery backend returns a malformed /discovery/nodes or /discovery/fetchs response whose data/service/instance entries are not JSON objects, crashing any bRPC client that refreshes its server list.\n\nHow to Fix:\n1. Upgrade bRPC to version 1.18.0 or later, which fixes this issue.\n2. Apply this patch: https://github.com/apache/brpc/pull/3533\n\nThe fix validates that the Discovery response data, per-service data, and instance entries are JSON objects (and skips non-object node/instance entries and rejects non-object data/service values) before calling member accessors.",
                    "lang": "en",
                    "supportingMedia": [
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                            "value": "<pre>The Discovery naming-service reply parser in Apache bRPC (versions &lt; 1.18.0) calls RapidJSON object-only accessors (FindMember) on JSON values without first validating that those values are objects. A malformed Discovery response whose data/service members or instances list contain non-object entries (e.g. a bare integer) triggers the RapidJSON object-access precondition on the client, reading memory out of bounds and potentially crashing the bRPC client.<br><br>Root Cause:<br>In src/brpc/policy/discovery_naming_service.cpp, DiscoveryNamingService::GetServers() and DiscoveryNames::ListDiscoveryNodes() access JSON values with member functions on non-object values. RapidJSON only defines these operations for object types; invoking them on a non-object violates the class invariant and results in undefined behavior (out-of-bounds read), commonly crashing the process.<br><br>Affected Scenarios: <br>An operator-configured (or compromised) Discovery backend returns a malformed /discovery/nodes or /discovery/fetchs response whose data/service/instance entries are not JSON objects, crashing any bRPC client that refreshes its server list.<br><br>How to Fix:<br>1. Upgrade bRPC to version 1.18.0 or later, which fixes this issue.<br>2. Apply this patch: https://github.com/apache/brpc/pull/3533<br><br>The fix validates that the Discovery response data, per-service data, and instance entries are JSON objects (and skips non-object node/instance entries and rejects non-object data/service values) before calling member accessors.</pre>"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://github.com/apache/brpc/pull/3533"
                },
                {
                    "url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb",
                    "tags": [
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                        "content": {
                            "text": "moderate"
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                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
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                            "baseSeverity": "MEDIUM",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
                            "integrityImpact": "NONE",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "LOW",
                            "privilegesRequired": "LOW",
                            "confidentialityImpact": "NONE"
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-26T13:54:35.426140Z",
                                "id": "CVE-2026-87849",
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                                        "Exploitation": "none"
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