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    CVE-2025-5025

    libcurl supports *pinning* of the server certificate public key for HTTPS transfers. Due to an omission, this check is not performed when connecting with QUIC for HTTP/3, when the TLS backend is wolfSSL. Documentation says the option works with wolfSSL, failing to specify that it does not for QUIC and HTTP/3. Since pinning makes the transfer succeed if the pin is fine, users could unwittingly connect to an impostor server without noticing.

    Published:May 28, 2025
    Last Modified:Jul 30, 2025
    EPS:May 28, 2025
    EPSS Score:0.0002
    CVSS Score:4.8

    Affected Products

    Vendor
    Curl
    Product
    Curl
    Vendor
    Haxx
    Product
    Curl

    Exploits

    https://hackerone.com/reports/3153497https://github.com/KiPhuong/cve-2025-5025

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    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