CURL-CVE-2026-86411

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Source
https://curl.se/docs/CVE-2026-86411.html
Import Source
https://curl.se/docs/CURL-CVE-2026-86411.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-86411
Aliases
  • CVE-2026-86411
Published
2026-10-14T08:00:00Z
Modified
2026-10-25T01:05:15Z
Summary
FTP connection reuse inherits client-certificate
Details

An ftp:// transfer configured with CURLUSESSL_NONE can reuse a pooled FTP control connection that a previous easy handle upgraded with STARTTLS and authenticated using a client certificate. The second handle performs neither a new TLS handshake nor a new FTP login, so the server continues to authorize it under the first handle's certificate identity.

Database specific 
{
    "CWE": {
        "desc": "Exposure of Data Element to Wrong Session",
        "id": "CWE-488"
    },
    "URL": "https://curl.se/docs/CVE-2026-86411.json",
    "affects": "both",
    "issue": "https://hackerone.com/reports/3973190",
    "last_affected": "8.21.0",
    "package": "curl",
    "severity": "Low",
    "www": "https://curl.se/docs/CVE-2026-86411.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
8.21.0
Fixed
8.22.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
4ff212f8ed328fb95261e11add8f4d2f0616895a
Fixed
72352daba01ba8072b6c1c0254cb77860ed1ab06

Affected versions

8.*
8.21.0
Other
curl-8_21_0
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-2026-86411.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "137408457246507356568929899392562883991",
            "length": 447
        },
        "id": "CURL-CVE-2026-86411-15332d56",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/72352daba01ba8072b6c1c0254cb77860ed1ab06",
        "target": {
            "file": "lib/url.c",
            "function": "url_match_ssl_use"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "70148836786215020066010817017207029492",
                "214623997824184722186061516736204732779",
                "292579498451215313658478325050399342438",
                "316184936108029474586670763707240004974"
            ],
            "threshold": 0.9
        },
        "id": "CURL-CVE-2026-86411-1978bf57",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/72352daba01ba8072b6c1c0254cb77860ed1ab06",
        "target": {
            "file": "lib/url.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-25T01:05:15Z"