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    CVE-2025-63656

    An out-of-bounds read in the header_cmp function (mk_server/mk_http_parser.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

    Published:Jan 29, 2026
    Last Modified:Feb 13, 2026
    EPS:Jan 29, 2026
    EPSS Score:0.0069
    CVSS Score:7.5

    Affected Products

    Vendor
    Monkey
    Product
    Monkey
    Vendor
    Monkey-project
    Product
    Monkey

    Exploits

    https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2025.mdhttps://github.com/monkey/monkey/issues/426

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2025-63650 (CVSS 7.5) — An out-of-bounds read in the mk_ptr_to_buf in mk_core function (mk_memory.c) of monkey commit f37e984 allows a…
    CVE-2025-63649 (CVSS 7.5) — An out-of-bounds read in the http_parser_transfer_encoding_chunked function (mk_server/mk_http_parser.c) of mo…
    CVE-2025-63658 (CVSS 7.5) — A stack overflow in the mk_http_index_lookup function (mk_server/mk_http.c) of monkey commit f37e984 allows at…
    CVE-2025-63655 (CVSS 7.5) — A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of monkey commit f37e984 …
    CVE-2025-63652 (CVSS 7.5) — A use-after-free in the mk_http_request_end function (mk_server/mk_http.c) of monkey commit f37e984 allows att…
    CVE-2025-63653 (CVSS 7.5) — An out-of-bounds read in the mk_vhost_fdt_close function (mk_server/mk_vhost.c) of monkey commit f37e984 allow…
    CVE-2025-63657 (CVSS 7.5) — An out-of-bounds read in the mk_mimetype_find function (mk_server/mk_mimetype.c) of monkey commit f37e984 allo…
    CVE-2025-63651 (CVSS 7.5) — A use-after-free in the mk_string_char_search function (mk_core/mk_string.c) of monkey commit f37e984 allows a…

    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