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Vulnerabilities

Vulnerability · 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

Published Oct 20, 2025 · catalog updated Oct 20, 2025 · Stack-based Buffer Overflow in

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-11678. EPSS is 0.29%. Act only if a listed version of Stack-based Buffer Overflow in is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Stack-based Buffer Overflow in).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Vendor / distro source
Affected products
vendor warmcat libwebsocket 4.0 ≤4.4.2

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor warmcat libwebsocket 4.0 ≤4.4.24.0 ≤4.4.2

How to fix CVE-2025-11678

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-11678. EPSS is 0.29%. Act only if a listed version of Stack-based Buffer Overflow in is installed.

Which versions are affected?

Compare what you have installed with warmcat libwebsocket 4.0 ≤4.4.2 4.0 ≤4.4.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2025 · EUVD

    Detected

    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.

  2. Oct 20, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-11678

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-11678

    30-day exploitation probability 0.29%

    first.org
  • EUVDVulnerability recordEUVD-2025-35057

    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 c

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 26, 2026
  • CVE.orgOct 26, 2026
  • EUVDOct 26, 2026