Curl · Curl · CVE-2026-82209
**Name of the Vulnerable Software and Affected Versions**
curl (affected versions not specified)
**Description**
When libpsl support is enabled, the software fails to enforce the Public Suffix List boundary check while processing a `Set-Cookie` header. This occurs when the `Domain` attribute explicitly matches an origin host that is a public suffix, such as `co.uk`. Instead of treating it as a strict host-only cookie, the system saves it with a wildcard domain scope (`.co.uk`). This leads to the cookie being incorrectly included in subsequent outbound requests or HTTP redirects to arbitrary sibling subdomains under the same public suffix, such as `attacker.co.uk`.
**Recommendations**
At the moment, there is no information about a newer version that contains a fix for this vulnerability.