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-2026-80229

CVE-2026-80229HIGH

curl curl — OpenSSL provider use-after-free

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0056   44.8     —

AFFECTED
  Product  Versions                                    Fixed
  curl     8.14.0 –                                    —
  curl     f2ce6c46b9dcc46ced0ce43fa95176ea7599a854 –  —
  curl     8.21.0 –                                    —

TIMELINE
  Aug 26  Reserved by curl
  Sep 6   Published (CNA: curl)
  Sep 11  EXPLOIT PUBLISHED — CVE-2026-80229 (curl). Public exploit reference added.
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-80229 (curl). Public exploit reference added.

CWE-416 · CNA: curl · CVSS v3.1 · 3 references · NVD status: Modified

Description

When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating easy handles. In OpenSSL 3 provider configurations, libcurl attaches an allocated library context to the easy handle's state and passes it to OpenSSL without acquiring an ownership reference; destroying the easy handle prematurely frees this context while the active connection retains a dangling pointer, leading to a heap-use-after-free upon subsequent I/O or post-handshake operations.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
August 26, 2026	Reserved	Reserved by curl
September 6, 2026	Published	Published (CNA: curl)
September 11, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-80229 (curl). Public exploit reference added.
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-80229 (curl). Public exploit reference added.

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
curl	curl	—	8.14.0	—
curl	curl	—	f2ce6c46b9dcc46ced0ce43fa95176ea7599a854	—
curl	curl	—	8.21.0	—

Weaknesses

CWE-416

References (3)

https://curl.se/docs/CVE-2026-80229.html [Patch, Vendor Advisory]
https://curl.se/docs/CVE-2026-80229.json [Vendor Advisory]
https://hackerone.com/reports/3969255 [Exploit, Mitigation, Third Party Advisory]

Authoritative record: CVE-2026-80229 at cve.org

Vendors: curl

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-80229 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.