CURL-CVE-2026-82208

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Source
https://curl.se/docs/CVE-2026-82208.html
Import Source
https://curl.se/docs/CURL-CVE-2026-82208.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-82208
Aliases
  • CVE-2026-82208
Published
2026-09-02T08:00:00Z
Modified
2026-09-07T14:06:34Z
Summary
wolfSSL CA-cache hit overrides callback
Details

With the wolfSSL backend, when CA caching is enabled and an CURLOPT_SSL_CTX_FUNCTION callback replaces the trust store, libcurl can silently reinstall the cached store after the callback returns. A certificate trusted by the cached store but rejected by the callback-selected store is then incorrectly accepted.

Database specific 
{
    "CWE": {
        "desc": "Improper Certificate Validation",
        "id": "CWE-295"
    },
    "URL": "https://curl.se/docs/CVE-2026-82208.json",
    "affects": "lib",
    "issue": "https://hackerone.com/reports/3973090",
    "last_affected": "8.21.0",
    "package": "curl",
    "severity": "Low",
    "www": "https://curl.se/docs/CVE-2026-82208.html"
}
Credits
    • Stanislav Fort (Aisle Research) - FINDER
    • Stefan Eissing - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
8.9.1
Fixed
8.22.0
Type
SEMVER
Events
Introduced
8.9.1
Fixed
8.20.1
Type
SEMVER
Events
Introduced
8.9.1
Fixed
8.16.1
Type
SEMVER
Events
Introduced
8.9.1
Fixed
8.14.2
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
0f2876b2c33f6784a27b6f7345bd8cd95b46352a
Fixed
ed0338befd1d865a8ea1fbaa90013a096dedd07a

Affected versions

8.*
8.10.0
8.10.1
8.11.0
8.11.1
8.12.0
8.12.1
8.13.0
8.14.0
8.14.1
8.15.0
8.16.0
8.17.0
8.18.0
8.19.0
8.20.0
8.21.0
8.9.1
Other
curl-8_10_0
curl-8_10_1
curl-8_11_0
curl-8_11_1
curl-8_12_0
curl-8_12_1
curl-8_13_0
curl-8_14_0
curl-8_14_1
curl-8_15_0
curl-8_16_0
curl-8_17_0
curl-8_18_0
curl-8_19_0
curl-8_20_0
curl-8_21_0
curl-8_9_1
rc-8_18_0-1
rc-8_18_0-2
rc-8_18_0-3
rc-8_19_0-1
rc-8_19_0-2
rc-8_19_0-3
rc-8_20_0-1
rc-8_20_0-2
rc-8_20_0-3
rc-8_21_0-1
rc-8_21_0-2
rc-8_21_0-3
rc-8_22_0-1
rc-8_22_0-2
rc-8_22_0-3

Database specific

source 
"https://curl.se/docs/CURL-CVE-2026-82208.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "3923404689551009163607441279828111175",
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                "56205908250059361441879990564662064602",
                "85439685350400643831478693185264849405",
                "206455418915853995366232742870540736875",
                "308268091786777598060810704004673016972",
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                "69518472294264634418027510581645809159",
                "72674729481011985343164199229800799409",
                "194300608716949252276030240923330874213",
                "81827856355291595232907156722595705799"
            ],
            "threshold": 0.9
        },
        "id": "CURL-CVE-2026-82208-004be86c",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/ed0338befd1d865a8ea1fbaa90013a096dedd07a",
        "target": {
            "file": "lib/vtls/wolfssl.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "39676463464626033682420662062357537373",
            "length": 1763
        },
        "id": "CURL-CVE-2026-82208-790f655b",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/ed0338befd1d865a8ea1fbaa90013a096dedd07a",
        "target": {
            "file": "lib/vtls/wolfssl.c",
            "function": "wssl_init_ech"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "1807422166572413733492374297762200315",
            "length": 2147
        },
        "id": "CURL-CVE-2026-82208-9159197f",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/ed0338befd1d865a8ea1fbaa90013a096dedd07a",
        "target": {
            "file": "lib/vtls/wolfssl.c",
            "function": "wssl_populate_x509_store"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "128549031654971917451338542360004250539",
            "length": 973
        },
        "id": "CURL-CVE-2026-82208-9a967e5c",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/ed0338befd1d865a8ea1fbaa90013a096dedd07a",
        "target": {
            "file": "lib/vtls/wolfssl.c",
            "function": "Curl_wssl_setup_x509_store"
        }
    }
]
vanir_signatures_modified 
"2026-09-07T14:06:34Z"