CURL-CVE-2026-86413

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Source
https://curl.se/docs/CVE-2026-86413.html
Import Source
https://curl.se/docs/CURL-CVE-2026-86413.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2026-86413
Aliases
  • CVE-2026-86413
Published
2026-10-14T08:00:00Z
Modified
2026-10-25T01:05:21Z
Summary
Negotiate credentials sent to redirected origin
Details

When using an ambient user in a first transfer doing Negotiate authentication and asked to follow redirects, curl could pass on its credential details to an unrelated second origin when asked to redirect there.

Database specific 
{
    "CWE": {
        "desc": "Information Exposure Through Sent Data",
        "id": "CWE-201"
    },
    "URL": "https://curl.se/docs/CVE-2026-86413.json",
    "affects": "both",
    "issue": "https://hackerone.com/reports/3993549",
    "last_affected": "8.22.0",
    "package": "curl",
    "severity": "Low",
    "www": "https://curl.se/docs/CVE-2026-86413.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
8.23.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
8f71d0fde515aa4c68002477356c35bd79927729
Fixed
43029e2ec37eba2354ced199ccd8898de695858e

Affected versions

8.*
8.21.0
8.22.0
Other
curl-8_21_0
curl-8_22_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-2026-86413.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "197484543705449537405576979917654205683",
            "length": 1414
        },
        "id": "CURL-CVE-2026-86413-1e93bc7f",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/43029e2ec37eba2354ced199ccd8898de695858e",
        "target": {
            "file": "lib/url.c",
            "function": "url_attach_existing"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "187364918574459101311412106745538592488",
                "264975616631119401330704202978605564609",
                "317586723021531035471710209410329204294",
                "191577447307436254778621372265599242980",
                "177312209620819793276913791421236844650",
                "137629164407106226757418211430020627125",
                "41976915244105234222538516649574510234",
                "23352433916399309512248611259609034193"
            ],
            "threshold": 0.9
        },
        "id": "CURL-CVE-2026-86413-cdc88345",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/curl/curl.git/commit/43029e2ec37eba2354ced199ccd8898de695858e",
        "target": {
            "file": "lib/url.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-25T01:05:21Z"