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TI-2025-10708 Aliases CVE-2025-11678GHSA-2g39-f45w-2fcm

Stack-based Buffer Overflow in libwebsockets DNS response parsing

Priority LOW 35CWE-121Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-121 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00285 21st percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
warmcatlibwebsocket4.0 – 4.4.2; 4.0 – 4.3.6—No fix listedCNA
  • libwebsocket Vendorwarmcat Affected 4.0 – 4.4.2; 4.0 – 4.3.6 Fixed in — No fix listed CNA

Remediation

Red Hat 1 advisory

  • RHSA-2025:22969 Released 2025-12-09 · Red Hat rating Important
    Red Hat OpenStack Platform 17.1 (libwebsockets) security update
    • Red Hat OpenStack Platform 17.1 libwebsockets-4.3.0-2.el9ost

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Service Interconnect 2AffectedNo fix yet
Red Hat OpenStack Platform 17.1Fixed RHSA-2025:22969
Not affected: 1 product
  • Red Hat OpenStack Platform 16.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-11678
  2. 2026-10-03 Alias added: GHSA-2g39-f45w-2fcm

References

Patch 1

Advisory 1

  • TI-2026-54362 warmcat libwebsockets LECP CBOR Recording lecp.c report_raw_cbor out-of-bounds write CVSS 4.0MEDIUM 6.9
  • TI-2026-09152 warmcat libwebsockets SSH Protocol sshd.c lws_ssh_parse_plaintext resource consumption CVSS 4.0MEDIUM 6.9
  • TI-2025-01611 Undefined Behavior Due to Out-of-Bounds Pointer Arithmetic in libwebsockets CVSS 4.0CRITICAL 10.0
  • TI-2025-10707 Use After Free in libwebsockets WebSocket server CVSS 4.0MEDIUM 6.3
  • TI-2025-10710 Out-of-bounds Write in libwebsockets PNG parsing CVSS 4.0MEDIUM 5.9
  • TI-2025-10709 Out-of-bounds Read in libwebsockets PNG parsing CVSS 4.0MEDIUM 5.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences