CVE-2026-1528

Summary

ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process.

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Affected Software

VendorProductVersion RangeStatus
undiciundici>= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0affected
undiciundici6.24.0: 7.24.0unaffected

Weaknesses

  • CWE-248: CWE-248 Uncaught exception
  • CWE-1284: CWE-1284 Improper validation of specified quantity in input

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

undici: undici: Denial of Service via crafted WebSocket frame with large length

Additional References

References