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Fencer Intel
high 7.5

CVE-2026-54466 json

websocket-driver: Message corruption via abuse of protocol length headers

published 5mo ago modified 18d ago also EUVD-2026-45335 , GHSA-xv26-6w52-cph6

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.7.5, 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 in lib/websocket/driver/draft75.js; because JavaScript numbers are 64-bit floating point values, this number will eventually lose precision and lead to the subsequent payload being parsed incorrectly. This issue is fixed in version 0.7.5.

Patch / fix

  • npm websocket-driver 0.7.5
  • faye websocket-driver 0.7.5
  • node-websocket-driver Debian 14 0.7.5+~cs0.6.14-1

debian advisories DEBIAN-CVE-2026-54466

  • agama-web-ui openSUSE Tumbleweed 24+0.a836cced5-52.1
  • agama-web-ui openSUSE Leap 16.0 17+673.b97ba64d6-160000.12.1

opensuse advisories openSUSE-SU-2026:11680-1openSUSE-SU-2026:21448-1

Is CVE-2026-54466 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 9.2 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
CNA 4.0 9.2 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
npm websocket-driver
<0.7.5
0.7.5

Affected products

  • faye websocket-driver-node

Classification

Weakness
  • CWE-130 Improper Handling of Length Parameter Inconsistency

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of faye/websocket-driver-node published their own advisory on GitHub. Reviewed sources take precedence over it.