CVE-2026-82209 Affecting curl package, versions <7.81.0-1ubuntu1.29


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.37% (29th percentile)

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  • Snyk IDSNYK-UBUNTU2204-CURL-19499303
  • published11 Sept 2026
  • disclosed6 Sept 2026

Introduced: 6 Sep 2026

CVE-2026-82209  (opens in a new tab)

How to fix?

Upgrade Ubuntu:22.04 curl to version 7.81.0-1ubuntu1.29 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:22.04 relevant fixed versions and status.

When libpsl support is enabled, libcurl fails to enforce the Public Suffix List boundary check when processing a Set-Cookie header where the Domain attribute explicitly matches an origin host that is itself a public suffix (e.g., Domain=co.uk set by co.uk).

Instead of coercing it into a strict host-only cookie, libcurl saves the cookie with wildcard domain scope (.co.uk). Consequently, the cookie is inappropriately included in subsequent outbound requests or HTTP redirects to arbitrary sibling subdomains under the same public suffix (e.g., attacker.co.uk).

CVSS Base Scores

version 3.1