Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U H H H 9.8 .0060 46.3 —
AFFECTED Product Versions Fixed curl 8.20.0 – —
TIMELINE Jun 10 Reserved by curl Jul 3 EXPLOIT PUBLISHED — CVE-2026-11856 (curl). Public exploit reference added. Jul 3 Published (CNA: curl)
Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.
| Date | Event | Detail |
|---|---|---|
| June 10, 2026 | Reserved | Reserved by curl |
| July 3, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-11856 (curl). Public exploit reference added. |
| July 3, 2026 | Published | Published (CNA: curl) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| curl | curl | — | 8.20.0 | — |
Authoritative record: CVE-2026-11856 at cve.org
Vendors: curl
Weaknesses: CWE-294
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-11856 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.