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CVE-2026-82209

high CVSS 8.2 EPSS 0.4%

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`).

Versions it affects

Software versions checked with the free lookup that CVE-2026-82209 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.14.2

At a glance

Severity
High
CVSS base score
8.2 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 29% of scored vulnerabilities
Weakness
CWE-201
Published
2026-09-06
NVD CVE.org

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