Detections
Analytics

Atlassian Bamboo 9.6.x < 9.6.25 / 10.x < 10.2.18 / 11.x < 12.1.6 Multiple Vulnerabilities

critical Nessus Plugin ID 311429

Synopsis

The remote Atlassian Bamboo host is missing a security update.

Description

The version of Atlassian Bamboo installed on the remote host is 9.6.x prior to 9.6.25, 10.x prior to 10.2.18, or 11.x prior to 12.1.6. It is, therefore, affected by multiple vulnerabilities:

 - An OS command injection vulnerability allows an authenticated attacker to execute commands on the remote system, which has high impact to confidentiality, integrity, and availability. (CVE-2026-21571)

 - A denial of service (DoS) vulnerability in the io.netty:netty-codec-http2 dependency. A remote user can trigger a DoS against a Netty HTTP/2 server by sending a flood of CONTINUATION frames, causing excessive CPU consumption with minimal bandwidth. (CVE-2026-33871)

 - An HTTP request smuggling vulnerability in the org.apache.tomcat:tomcat-catalina dependency via invalid chunk extension. (CVE-2026-24880)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Atlassian Bamboo version 9.6.25, 10.2.18, 12.1.6, or later.

See Also

http://www.nessus.org/u?34557da6

Plugin Details

Severity: Critical

ID: 311429

File Name: bamboo_9_6_25.nasl

Version: 1.1

Type: Remote

Family: CGI abuses

Published: 5/1/2026

Updated: 5/1/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus

Enable CGI Scanning: true

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-21571

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.4

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS Score Source: CVE-2026-21571

Vulnerability Information

CPE: cpe:/a:atlassian:bamboo

Required KB Items: installed_sw/bamboo

Excluded KB Items: Settings/disable_cgi_scanning

Patch Publication Date: 4/21/2026

Vulnerability Publication Date: 4/21/2026

Reference Information

CVE: CVE-2024-45801, CVE-2026-21571, CVE-2026-24734, CVE-2026-24880, CVE-2026-25639, CVE-2026-33870, CVE-2026-33871

IAVA: 2026-A-0396