---
id: "CVE-2026-127079"
page: "https://infrastack.ai/live/CVE-2026-127079"
kind: "vulnerability"
aliases: ["CVE-2026-127079"]
title: "OpsTree BuildPiper: missing rate limit lets attackers brute-force password reset codes"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["buildpiper", "other", "self-hosted"]
not_affected_if: ["version-2.7.0-or-later"]
published_at: "2026-11-13T10:18:04+00:00"
first_seen_at: "2026-11-13T10:47:29+00:00"
updated_at: "2026-11-13T10:48:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-127079", "first_seen_at": "2026-11-13T10:47:29+00:00"}]
exploit_sources: []
---

# OpsTree BuildPiper: missing rate limit lets attackers brute-force password reset codes

Link for people: https://infrastack.ai/live/CVE-2026-127079 (this .md is for agents)

OpsTree BuildPiper before 2.7.0 does not limit how many password-reset one-time codes can be tried. An unauthenticated attacker can guess the 6-digit code at the check_otp endpoint and reset a victim's password, taking over the account.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed BuildPiper version against the fixed version in the sources (unknown in the sources).
- Confirm whether the password-reset flow is reachable from the internet, since the sources do not say.

## Fix

- BuildPiper: upgrade to `2.7.0` or later (per the advisory's 'before 2.7.0' range).

## Timeline

- 2026-11-13T10:47:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-127079

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/opstree-buildpiper-before-2.7.0-otp-brute-force-via-password-reset-check-otp

## From the sources

OpsTree BuildPiper before 2.7.0 lacks rate limiting on password-reset OTP verification, allowing unauthenticated attackers to brute force 6-digit OTPs. Attackers can initiate a reset and submit unthrottled guesses to the check_otp endpoint, resetting the target's password and taking over the account.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_