CVE-2026-94265
Authorization: Negotiate sent to foreign origin
Published Oct 20, 2026
CVSS 3.1 · 9.1 Critical
EPSS < 1%
KEV · Not listed
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`.
`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
-
CVE record
-
NVD configurations
No data
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Red Hat packages
No data
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OpenCVE enrichment
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| curl | curl | unaffected |
|
No data.
No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Curl | Curl |
|
Remediation
Tracking
Advisories
Metrics
No CVSS v4.0
Attack Vector Network
Attack Complexity Low
Privileges Required None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact None
User Interaction None
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.776% probability within 30 days)
Exploitation poc
Automatable yes
Technical Impact total
References
History
Oct 30, 2026 5:30 PM
Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
cvssV3_1
|
ssvc
|
Oct 20, 2026 8:45 PM
Description updated. Title updated. Added references
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in curl. When processing an HTTP redirect to an address containing user credentials, curl improperly retains and retransmits authentication state. A malicious server can exploit this behavior by redirecting curl to an untrusted destination, forcing the client to transmit sensitive authentication tokens, such as Kerberos tickets, to the third party. This flaw can lead to unauthorized information disclosure of user credentials across domain boundaries. | 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`. |
| Title | curl: curl: Authorization: Negotiate sent to foreign origin | Authorization: Negotiate sent to foreign origin |
| References |
|
Oct 18, 2026 8:15 PM
First appearance in the feed. Affected vendors updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Curl
Curl curl |
|
| Vendors & Products |
Curl
Curl curl |
Oct 17, 2026 12:30 AM
Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated
View changes
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in curl. When processing an HTTP redirect to an address containing user credentials, curl improperly retains and retransmits authentication state. A malicious server can exploit this behavior by redirecting curl to an untrusted destination, forcing the client to transmit sensitive authentication tokens, such as Kerberos tickets, to the third party. This flaw can lead to unauthorized information disclosure of user credentials across domain boundaries. | |
| Title | curl: curl: Authorization: Negotiate sent to foreign origin | |
| Weaknesses | CWE-200 | |
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
|
Weaknesses