CVE-2025-11678

Published Oct 20, 2025 Modified Apr 15, 2026 CWE-121

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.

Is your site exposed to CVE-2025-11678?

Run a free security scan — no signup, results in seconds.

Weakness Type (CWE)

CWE-121 CWE-121

References

Frequently Asked Questions

What is CVE-2025-11678? +
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.
How do I check if I'm vulnerable to CVE-2025-11678? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2025-11678 — free, no signup required.