by Kastro
Paper/Archive/CVE-2026-94265

CVE-2026-94265

curl curl — Authorization: Negotiate sent to foreign origin

EPSS 0.3%public exploitCVSS 9.1
critical.is priorityof 100
43
CVSS 9.1 (ADP)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 27.3.273 × 205.5Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

When processing an HTTP redirect to a URL containing userinfo (a `username:password` component), curl might erroneously retain and re-transmit the original host's HTTP Negotiate authentication state. Consequently, a malicious server can trigger a redirect containing arbitrary userinfo to force curl to send a freshly minted Kerberos ticket—generated using the ambient identity of the client process to an untrusted third-party host, effectively bypassing the domain-scoping restrictions normally enforced by the absence of `--location-trusted`.

Affected

ProductAffectedFixed inSource
curl8.22.0 – 8.22.0–CNA
curl8.21.0 – 8.21.0–CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refcurl.se/docs/CVE-2026-94265.jsonrefcurl.se/docs/CVE-2026-94265.htmlexploithackerone.com/reports/4040551