---
title: "CVE-2026-105934: Apache Pulsar - Broken Access Control"
description: "Apache Pulsar 2.8.0 < versions < 4.0.14 and 4.1.0 < versions < 4.2.5 contain an authorization bypass caused by improper tenant admin role checks on partitioned topic truncation in the broker admin REST API, letting authenticated users with lookup permission truncate partitioned topics, skipping unacknowledged messages and deleting older ledgers, exploit requires authenticated user with lookup permission."
url: https://panop.io/threat-heartbeat/CVE-2026-105934/
---

# CVE-2026-105934 Apache Pulsar - Broken Access Control

Apache Pulsar 2.8.0 < versions < 4.0.14 and 4.1.0 < versions < 4.2.5 contain an authorization bypass caused by improper tenant admin role checks on partitioned topic truncation in the broker admin REST API, letting authenticated users with lookup permission truncate partitioned topics, skipping unacknowledged messages and deleting older ledgers, exploit requires authenticated user with lookup permission.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105934)

## Details

Type

Broken Access Control

Impact

Data Tampering, Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

21 October 2026

Updated

22 October 2026

Weakness

[CWE-862](https://cwe.mitre.org/data/definitions/862.html)

## Vendor fix

Upgrade to Apache Pulsar 4.0.14, 4.2.5 or later versions.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105934](https://nvd.nist.gov/vuln/detail/CVE-2026-105934)
- [https://lists.apache.org/thread.html/ox0vy41jlb41y2l04y7b6h2srlyqoj8o](https://lists.apache.org/thread.html/ox0vy41jlb41y2l04y7b6h2srlyqoj8o)
- [https://pulsar.apache.org/security/CVE-2026-105934/](https://pulsar.apache.org/security/CVE-2026-105934/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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