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    "cveMetadata": {
        "cveId": "CVE-2026-16158",
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "state": "PUBLISHED",
        "assignerShortName": "openjs",
        "dateReserved": "2026-07-17T21:22:28.153Z",
        "datePublished": "2026-07-18T12:28:17.262Z",
        "dateUpdated": "2026-07-20T15:15:50.016Z"
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            "descriptions": [
                {
                    "lang": "en",
                    "value": "Impact: @fastify/reply-from versions from 8.3.1 up to but not including 12.6.4 build the internal URL cache key by concatenating the destination and source path without a delimiter. Different destination and source pairs can therefore produce the same key while resolving to different upstream URLs. When getUpstream selects an upstream from request data, a URL cached for one upstream can be reused for a request intended for another upstream, causing cross-upstream data access and modification. The default configuration is affected. Setting disableCache to true prevents the behavior. Patches: upgrade to @fastify/reply-from 12.6.4. Workarounds: pass disableCache: true when registering the plugin.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "Impact: @fastify/reply-from versions from 8.3.1 up to but not including 12.6.4 build the internal URL cache key by concatenating the destination and source path without a delimiter. Different destination and source pairs can therefore produce the same key while resolving to different upstream URLs. When getUpstream selects an upstream from request data, a URL cached for one upstream can be reused for a request intended for another upstream, causing cross-upstream data access and modification. The default configuration is affected. Setting disableCache to true prevents the behavior. Patches: upgrade to @fastify/reply-from 12.6.4. Workarounds: pass disableCache: true when registering the plugin."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "@fastify/reply-from",
                    "product": "@fastify/reply-from",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "8.3.1",
                            "lessThan": "12.6.4"
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                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "12.6.4"
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                    ],
                    "packageURL": "pkg:npm/@fastify/reply-from"
                }
            ],
            "references": [
                {
                    "url": "https://github.com/fastify/fastify-reply-from/security/advisories/GHSA-v574-6498-x57v"
                },
                {
                    "url": "https://cna.openjsf.org/security-advisories.html"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "HamdaanAliQuatil"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "mcollina"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "UlisesGascon"
                },
                {
                    "lang": "en",
                    "type": "remediation reviewer",
                    "value": "climba03003"
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            ],
            "title": "@fastify/reply-from vulnerable to cross-upstream request routing via URL cache key collision",
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                        "version": "3.1",
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                        "baseScore": 8.7,
                        "baseSeverity": "HIGH"
                    },
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                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
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            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-441",
                            "lang": "en",
                            "description": "CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')",
                            "type": "CWE"
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                                "timestamp": "2026-07-20T15:15:40.003591Z",
                                "id": "CVE-2026-16158",
                                "options": [
                                    {
                                        "Exploitation": "none"
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                                        "Automatable": "no"
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                                        "Technical Impact": "total"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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