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CVE-2025-11678

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Date: October 20, 2025

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.

Severity Score

Related Resources (4)

https://nvd.nist.gov/vuln/detail/CVE-2025-11678
https://libwebsockets.org/git/libwebsockets/commit?id=2bb9598562b37c942ba5b04bcde3f7fdf66a9d3a
https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11678
https://www.mend.io/vulnerability-database/CVE-2025-11678

Severity Score

Weakness Type (CWE)

Stack-based Buffer Overflow

CWE-121

CVSS v3.1

Base Score:
Attack Vector (AV): ADJACENT_NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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