CVE-2026-80229 Affecting curl package, versions <8.20.0-2ubuntu11


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.56% (45th percentile)

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  • Snyk IDSNYK-UBUNTU2610-CURL-21238701
  • published18 Oct 2026
  • disclosed6 Sept 2026

Introduced: 6 Sep 2026

CVE-2026-80229  (opens in a new tab)

How to fix?

Upgrade Ubuntu:26.10 curl to version 8.20.0-2ubuntu11 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu. See How to fix? for Ubuntu:26.10 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1