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    CVE-2026-92391

    A deeply nested multipart MIME structure constructed via the public API causes a stack overflow in libcurl during normal cleanup operations. An excessive recursion depth within `curl_mime_free` leads to unbounded stack frame allocation during structure traversal, ultimately crashing the host process.

    Published:Oct 14, 2026
    Last Modified:Oct 20, 2026
    EPS:Oct 20, 2026
    EPSS Score:
    CVSS Score:3.7

    Affected Products

    Vendor
    Curl
    Product
    Curl

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-674 Uncontrolled Recursion

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads

    Related CVEs

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    CVE-2026-87866 (CVSS 3.7) — When built with wolfSSL, curl can successfully validate a pinned public key hash against a key the TLS peer do…
    CVE-2026-87865 (CVSS 3.7) — When libcurl uses libssh2 with a hashed `known_hosts` file, an unrelated initial entry can cause host key vali…
    CVE-2026-87864 (CVSS 3.7) — Enabling `CURLOPT_CRLF` causes curl to advertise the raw input byte count in the `IMAP APPEND {N}` literal whi…
    CVE-2026-87862 (CVSS 3.7) — Importing a `includeSubDomains` parent HSTS entry before a longer-lived child entry, silently drops the child.…
    CVE-2026-87861 (CVSS 3.7) — When using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connectio…
    CVE-2026-92387 (CVSS 3.7) — By permanently omitting the final control-response line, a malicious FTP, IMAP, POP3, or SMTP server can explo…
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    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