Reference page — cumulative record through Tuesday, October 6, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-8286

CVE-2026-8286HIGH

curl curl — wrong STARTTLS connection reuse

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  H  N    8.1   .0031   21.6     —

AFFECTED
  Product  Versions                                    Fixed
  curl     7.30.0 –                                    —
  curl     a1701eea289fe7ea80651f801cf992838a491dde –  —
  curl     8.20.0 –                                    —

TIMELINE
  May 11  Reserved by curl
  Jul 3   EXPLOIT PUBLISHED — CVE-2026-8286 (curl). Public exploit reference added.
  Jul 3   Published (CNA: curl)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-8286 (curl). Public exploit reference added.

CWE-295 · CNA: curl · CVSS v3.1 · 3 references · NVD status: Modified

Description

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 11, 2026	Reserved	Reserved by curl
July 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-8286 (curl). Public exploit reference added.
July 3, 2026	Published	Published (CNA: curl)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-8286 (curl). Public exploit reference added.

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
curl	curl	—	7.30.0	—
curl	curl	—	a1701eea289fe7ea80651f801cf992838a491dde	—
curl	curl	—	8.20.0	—

Weaknesses

CWE-295

References (3)

https://curl.se/docs/CVE-2026-8286.html [Patch, Vendor Advisory]
https://curl.se/docs/CVE-2026-8286.json [Vendor Advisory]
https://hackerone.com/reports/3718195 [Exploit, Issue Tracking, Third Party Advisory]

Authoritative record: CVE-2026-8286 at cve.org

Vendors: curl

Weaknesses: CWE-295

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-8286 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 Tuesday, October 6, 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.