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    CVE-2026-8924

    A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.

    Published:Jul 3, 2026
    Last Modified:Jul 7, 2026
    EPS:Jul 3, 2026
    EPSS Score:0.00536
    CVSS Score:9.1

    Affected Products

    Vendor
    Curl
    Product
    Curl

    Exploits

    https://hackerone.com/reports/3733905https://hackerone.com/reports/3733905

    Related CVEs

    CVE-2026-82209 (CVSS 8.2) — When libpsl support is enabled, libcurl fails to enforce the Public Suffix List boundary check when processing…
    CVE-2026-82208 (CVSS 7.5) — With the wolfSSL backend, when CA caching is enabled and an `CURLOPT_SSL_CTX_FUNCTION` callback replaces the t…
    CVE-2026-80255 (CVSS 7.5) — A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of space (ascii code 32) immediately b…
    CVE-2026-80231 (CVSS 7.5) — A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when usi…
    CVE-2026-80230 (CVSS 7.5) — When `CURLOPT_PINNEDPUBLICKEY` is configured alongside options that disable standard peer verification (`CURLO…
    CVE-2026-80229 (CVSS 7.5) — When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating …
    CVE-2026-19931 (CVSS 9.8) — A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authent…
    CVE-2026-18924 (CVSS 9.1) — A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections…
    CVE-2026-13608 (CVSS 7.4) — A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be m…
    CVE-2026-9547 (CVSS 7.4) — When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KE…

    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