faye websocket-driver up to 0.7.4 draft75.js integer overflow

Summaryinfo

A vulnerability has been found in faye websocket-driver up to 0.7.4 and classified as very critical. The impacted element is an unknown function of the file lib/websocket/driver/draft75.js. The manipulation leads to integer overflow. This vulnerability is documented as CVE-2026-54466. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in faye websocket-driver up to 0.7.4. This issue affects an unknown part of the file lib/websocket/driver/draft75.js. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-54466 since 06/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/18/2026).

Upgrading to version 0.7.5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-45335). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Hardware Driver Software

Vendor

• faye

Name

• websocket-driver

Version

• 0.7.0
• 0.7.1
• 0.7.2
• 0.7.3
• 0.7.4

CPE 2.3info

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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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