CVE-2026-82209

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    CVE-2026-82209

    Published: 6 Sept 2026Last Modified: 17 Sept 2026

    Summary: domain-scoped PSL domain cookie

    Details: 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`).

    References: https://curl.se/docs/CVE-2026-82209.html, https://curl.se/docs/CVE-2026-82209.json, https://hackerone.com/reports/3972385, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82209.json, https://nvd.nist.gov/vuln/detail/CVE-2026-82209, https://github.com/curl/curl.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- e2ae32ff5f3ab6f0819590f61f248f17df12987f
    Fixed -01346829096c61b372692f6dc43ffa778c6caccd

    Affected versions

    7.46.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-82209 | CVE-DB