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Not yet scoredPublished Oct 20, 2026
CVE-2026-87861cross-origin reuse of a Negotiate connection
Updated under an hour ago ()
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It affects curl. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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When using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connection previously authenticated via Negotiate for a different origin, leaving the request's intended credentials unused.
- CVSS
- Not yet scored
- Weakness (CWE)
- CWE-201
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- curl
- NVD analysis
- Received
- Record last updated
- Oct 20, 2026
- First seen by InfoSec Signals
- Oct 20, 2026
Affected products
curl curl curl:curl (from the name) | from 8.22.0 through 8.22.0; from 8.21.0 through 8.21.0 | CNA record |
References
- https://curl.se/docs/CVE-2026-87861.json
- https://curl.se/docs/CVE-2026-87861.html
- https://hackerone.com/reports/3972094
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.