Caddy: Unsafe Unicode Handling in FastCGI splitPos Allows Execution of Non-PHP Files_CVE-2026-45135

{
    "lastseen": "",
    "description": "Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transport's splitPos() in modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead Caddy's FastCGI splitting into treating a non-.php (or other configured split_path extension) file as a script. In any deployment where the attacker can place content into a file served via FastCGI (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This vulnerability is fixed in 2.11.3.",
    "published": "2026-06-23T17:56:42.662Z",
    "modified": "2026-06-23T17:56:42.662Z",
    "type": "cve",
    "title": "Caddy: Unsafe Unicode Handling in FastCGI splitPos Allows Execution of Non-PHP Files",
    "source": "GitHub_M",
    "references": "https://github.com/caddyserver/caddy/security/advisories/GHSA-m675-2p33-xv9g",
    "id": "CVE-2026-45135",
    "bulletinFamily": "",
    "cwe": [
        "CWE-20",
        "CWE-176",
        "CWE-178"
    ],
    "cvelist": null,
    "sourceData": "caddyserver caddy >= 2.7.0, < 2.11.3",
    "sourceHref": "",
    "cvss": {
        "score": 8.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "caddy",
    "version": ">= 2.7.0, < 2.11.3",
    "vendor": "caddyserver",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}