CVE-2026-82209

Description

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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Produits concernés

• curl
• Haxx curl

Scores CVSS

Faiblesses (CWE)

• CWE-201

Références

• https://curl.se/docs/CVE-2026-82209.html PatchVendor Advisory
• https://curl.se/docs/CVE-2026-82209.json Vendor Advisory
• https://hackerone.com/reports/3972385 ExploitMitigationThird Party Advisory
• https://hackerone.com/reports/3972385 ExploitMitigationThird Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories