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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.

PUBLISHED Reserved 2025-10-13 | Published 2025-10-20 | Updated 2025-10-20 | Assigner Nozomi




HIGH: 7.5CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-121 Stack-based Buffer Overflow

Product status

Default status
unaffected

4.0 (semver)
affected

4.0 (semver)
affected

Credits

Raffaele Bova at Nozomi Networks finder

References

libwebsockets.org/...bb9598562b37c942ba5b04bcde3f7fdf66a9d3a patch vendor-advisory

www.nozominetworks.com/...rability-advisories-cve-2025-11678 third-party-advisory

cve.org (CVE-2025-11678)

nvd.nist.gov (CVE-2025-11678)

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