GHSA-hf33-q6cf-c66f

Suggest an improvement
Source
https://github.com/advisories/GHSA-hf33-q6cf-c66f
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hf33-q6cf-c66f/GHSA-hf33-q6cf-c66f.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-hf33-q6cf-c66f
Aliases
Published
2026-09-21T21:47:40Z
Modified
2026-09-21T22:00:06Z
Severity
  • 4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N CVSS Calculator
Summary
nginx ignition has TOTP Reuse During Validity Window
Details

Summary

Any user that has enabled the OTP 2FA can have their TOTP reused during the standard 30 second validity window.

Details

The https://github.com/pquerna/otp package doesn't include checking for already used TOTPs within its the validity window. This requires each application that uses the package to implement their own method of tracking and verifying that codes can't be reused.

Section 6.5.1 within the Authentication section of the OWASP ASVS recommends multiple checks, some of which involving TOTPs:

Verify that lookup secrets, out-of-band authentication requests or codes, and time-based one-time passwords (TOTPs) are only successfully usable once.

The OWASP WSTG also references this as one of their checks to look for:

Can the OTPs be used more than once?

PoC

https://github.com/user-attachments/assets/86a43374-39bf-4d61-8f6d-5cc440c99a1e

Impact

Any user who uses 2FA could be impacted if their traffic is able to be captured, they're phished/social engineered, or other methods of attack. This disrupts one layer of the defense-in-depth model surrounding 2FA.

Similar CVEs

Remediation

Store a deny-list of TOTP codes for their validity windows and check submitted codes against it to ensure none are being reused. After their validity window has closed, the 2FA code can be removed from the list.

Database specific 
{
    "cwe_ids":  [
        "CWE-287"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-21T21:47:40Z",
    "nvd_published_at":  "2026-09-21T15:17:30Z",
    "severity":  "MODERATE"
}
References

Affected packages

Go / github.com/lucasdillmann/nginx-ignition

Package

Name
github.com/lucasdillmann/nginx-ignition
View open source insights on deps.dev
Purl
pkg:golang/github.com/lucasdillmann/nginx-ignition

Affected ranges

Type
SEMVER
Events
Introduced
0.0.0-20260217145239-1cbfae0296f1
Fixed
0.0.0-20260328015550-8d35e1eb5dd6

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hf33-q6cf-c66f/GHSA-hf33-q6cf-c66f.json"