What’s Vulnerable › Vulnerabilities

CVE-2026-94265: Authorization: Negotiate sent to foreign origin

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-30
• Weakness: CWE-200

Description

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 products

• curl: from 8.22.0 through 8.22.0; from 8.21.0 through 8.21.0

References

• https://curl.se/docs/CVE-2026-94265.html
• https://curl.se/docs/CVE-2026-94265.json
• https://hackerone.com/reports/4040551
• https://hackerone.com/reports/4040551

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