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CVE-2026-82209
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).
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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