Authorization: Negotiate sent to foreign origin

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-94265
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 21:17:22 UTC
Updated2026-10-30 17:17:31 UTC
DescriptionWhen 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`.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.007760000 probability, percentile 0.558090000 (date 2026-11-01)

Problem Types: CWE-200 | CWE-200 Exposure of Sensitive Information to an Unauthorized Actor | CWE-200 CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Curl Curl affected 8.22.0 8.22.0 semver Not specified
CNA Curl Curl affected 8.21.0 8.21.0 semver Not specified

References

ReferenceSourceLinkTags
curl.se/docs/CVE-2026-94265.json 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
curl.se/docs/CVE-2026-94265.html 2499f714-1537-4658-8207-48ae4bb9eae9 curl.se
hackerone.com/reports/4040551 134c704f-9b21-4f2e-91b3-4a467353bcc0 hackerone.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Joshua Rogers (Aisle Research) (en)

CNA: Joshua Rogers (Aisle Research) (en)

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