CVE-2024-47178: basic-auth-connect's callback uses time unsafe string comparison

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-09-30 · updated 2026-06-17
Weakness: CWE-208

Description

basic-auth-connect is Connect's Basic Auth middleware in its own module. basic-auth-connect < 1.1.0 uses a timing-unsafe equality comparison that can leak timing information. This issue has been fixed in basic-auth-connect 1.1.0.

Affected products

expressjs basic-auth-connect: before 1.1.0 — fixed in 1.1.0

How to fix

Upgrade to a fixed version: expressjs basic-auth-connect 1.1.0. Check the vendor advisory for mitigations.

References

https://github.com/expressjs/basic-auth-connect/commit/bac1e6a8530e1efd0028800b9b588a37adb0d203
https://github.com/expressjs/basic-auth-connect/security/advisories/GHSA-7p89-p6hx-q4fw

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