Stack-based Buffer Overflow in libwebsockets DNS response parsing_CVE-2025-11678

7.5 / 10

HIGH

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Description

Stack-based Buffer Overflow in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.

Basic Information

ID CVE-2025-11678

Source Nozomi

Published Oct 20, 2025 at 13:51

Modified Oct 20, 2025 at 14:00

Affected Product

Vendor warmcat

Product libwebsocket

Version 4.0

Affected Versions warmcat libwebsocket 4.0
warmcat libwebsocket 4.0

CWE Classification

CWE-121

References

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    "lastseen": "",
    "description": "Stack-based Buffer Overflow\u00a0in lws_adns_parse_label in warmcat libwebsockets allows, when the LWS_WITH_SYS_ASYNC_DNS flag is enabled during compilation, to overflow the label_stack, when the attacker is able to sniff a DNS request in order to craft a response with a matching id containing a label longer than the maximum.",
    "published": "2025-10-20T13:51:17.328Z",
    "modified": "2025-10-20T14:00:37.720Z",
    "type": "cve",
    "title": "Stack-based Buffer Overflow in libwebsockets DNS response parsing",
    "source": "Nozomi",
    "references": "https://libwebsockets.org/git/libwebsockets/commit?id=2bb9598562b37c942ba5b04bcde3f7fdf66a9d3a\nhttps://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11678",
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    "sourceData": "warmcat libwebsocket 4.0\nwarmcat libwebsocket 4.0",
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        "score": 7.5,
        "severity": "HIGH",
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