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    CVE-2026-9079

    libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.

    Published:Jul 3, 2026
    Last Modified:Jul 6, 2026
    EPS:Jul 3, 2026
    EPSS Score:0.0025
    CVSS Score:9.8

    Affected Products

    Vendor
    Curl
    Product
    Curl

    Exploits

    https://hackerone.com/reports/3750295https://hackerone.com/reports/3750295

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    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