Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-11564

CVE-2026-11564CRITICAL

curl curl — Native CA trust persist

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  N    9.1   .0043   34.9     —

AFFECTED
  Product  Versions                                    Fixed
  curl     8.17.0 –                                    —
  curl     eefd03c572996e5de4dec4fe295ad6f103e0eefc –  —
  curl     8.20.0 –                                    —

TIMELINE
  Jun 8   Reserved by curl
  Jul 3   EXPLOIT PUBLISHED — CVE-2026-11564 (curl). Public exploit reference added.
  Jul 3   Published (CNA: curl)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-11564 (curl). Public exploit reference added.

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

Description

libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
June 8, 2026	Reserved	Reserved by curl
July 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-11564 (curl). Public exploit reference added.
July 3, 2026	Published	Published (CNA: curl)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-11564 (curl). Public exploit reference added.

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
curl	curl	—	8.17.0	—
curl	curl	—	eefd03c572996e5de4dec4fe295ad6f103e0eefc	—
curl	curl	—	8.20.0	—

Weaknesses

CWE-295

References (3)

https://curl.se/docs/CVE-2026-11564.html [Patch, Vendor Advisory]
https://curl.se/docs/CVE-2026-11564.json [Vendor Advisory]
https://hackerone.com/reports/3788984 [Exploit, Issue Tracking, Third Party Advisory]

Authoritative record: CVE-2026-11564 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-2026-11564 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 Sunday, October 4, 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.