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Vulnerability details

9.2/10
CVSS 4.0
GHSA-xv26-6w52-cph6
resolved Published 2026-07-15 Updated 2026-07-15
GitHub Advisory
Vulnerability Data from Dependency-Track
Affected versions
Score
9.2 CVSS 4.0 GITHUB CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
Description
### Impact The frame format in draft versions of the WebSocket protocol includes a length header that allows an arbitrarily large integer to be encoded as a sequence of bytes with the high bit set. By sending an indefinite sequence of bytes with values `0x80` or above, a client can make the server parse these bytes into an ever-growing integer. Since JavaScript numbers are 64-bit floating point values, this number will eventually lose precision and lead to the subsequent payload being parsed incorrectly. ### Patches The issue has been patched in version 0.7.5 by rejecting the message if the length header exceeds the configured maximum message length. All users should upgrade to this version. ### Workarounds No known workarounds exist. ### Acknowledgements This issue was discovered and reported by Pranjali Thakur, DepthFirst Security Research Team.
Same vulnerability as
CVE-2026-54466 resolved according to EUVD-2026-45335
Analysis Read only
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