libcurl supports pinning of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL.
Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3.
Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing.
{
    "last_affected": "8.13.0",
    "URL": "https://curl.se/docs/CVE-2025-5025.json",
    "severity": "Medium",
    "affects": "both",
    "issue": "https://hackerone.com/reports/3153497",
    "www": "https://curl.se/docs/CVE-2025-5025.html",
    "CWE": {
        "id": "CWE-295",
        "desc": "Improper Certificate Validation"
    },
    "award": {
        "currency": "USD",
        "amount": "2540"
    },
    "package": "curl"
}[
    {
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
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            ]
        },
        "signature_type": "Line",
        "id": "CURL-CVE-2025-5025-219c4e0f",
        "target": {
            "file": "lib/vtls/wolfssl.c"
        },
        "source": "https://github.com/curl/curl.git/commit/e1f65937a96a451292e9231339672797da86ecc5",
        "deprecated": false
    },
    {
        "signature_version": "v1",
        "digest": {
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            ]
        },
        "signature_type": "Line",
        "id": "CURL-CVE-2025-5025-3a886e20",
        "target": {
            "file": "lib/vquic/vquic-tls.c"
        },
        "source": "https://github.com/curl/curl.git/commit/e1f65937a96a451292e9231339672797da86ecc5",
        "deprecated": false
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        "signature_version": "v1",
        "digest": {
            "length": 2442.0,
            "function_hash": "312124394985011906056469256849086812336"
        },
        "signature_type": "Function",
        "id": "CURL-CVE-2025-5025-3b6161d2",
        "target": {
            "file": "lib/vtls/wolfssl.c",
            "function": "wssl_connect"
        },
        "source": "https://github.com/curl/curl.git/commit/e1f65937a96a451292e9231339672797da86ecc5",
        "deprecated": false
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        },
        "signature_type": "Line",
        "id": "CURL-CVE-2025-5025-507e710e",
        "target": {
            "file": "lib/vtls/wolfssl.h"
        },
        "source": "https://github.com/curl/curl.git/commit/e1f65937a96a451292e9231339672797da86ecc5",
        "deprecated": false
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        "digest": {
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            "function_hash": "7265168506872776594781231797554041452"
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        "signature_type": "Function",
        "id": "CURL-CVE-2025-5025-f69c1b13",
        "target": {
            "file": "lib/vtls/wolfssl.c",
            "function": "wssl_verify_pinned"
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        "source": "https://github.com/curl/curl.git/commit/e1f65937a96a451292e9231339672797da86ecc5",
        "deprecated": false
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        "digest": {
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            "function_hash": "21272719110480439985384758464724101584"
        },
        "signature_type": "Function",
        "id": "CURL-CVE-2025-5025-fb1f53fd",
        "target": {
            "file": "lib/vquic/vquic-tls.c",
            "function": "Curl_vquic_tls_verify_peer"
        },
        "source": "https://github.com/curl/curl.git/commit/e1f65937a96a451292e9231339672797da86ecc5",
        "deprecated": false
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]