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CVE-2026-27480: Static Web Server affected by timing-based username enumeration in Basic Authentication due to early response on invalid usernames

February 20, 2026

A Timing-based username enumeration in Basic Authentication vulnerability due to early response on invalid usernames could allow attackers to identify valid users and focus their efforts on targeted brute-force or credential-stuffing attacks.

References

  • github.com/advisories/GHSA-qhp6-635j-x7r2
  • github.com/static-web-server/static-web-server
  • github.com/static-web-server/static-web-server/commit/7bf0fd425eb10dac9bf9ef5febce12c4dd039ce1
  • github.com/static-web-server/static-web-server/security/advisories/GHSA-qhp6-635j-x7r2
  • nvd.nist.gov/vuln/detail/CVE-2026-27480

Code Behaviors & Features

Detect and mitigate CVE-2026-27480 with GitLab Dependency Scanning

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Affected versions

All versions starting from 2.1.0 before 2.41.0

Fixed versions

  • 2.41.0

Solution

Upgrade to version 2.41.0 or above.

Impact 5.3 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Learn more about CVSS

Weakness

  • CWE-204: Observable Response Discrepancy

Source file

cargo/static-web-server/CVE-2026-27480.yml

Spotted a mistake? Edit the file on GitLab.

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