kazeburo Monoceros up to 0.29 Request Body Reader sysread Content-Length resource consumption

Summaryinfo

A vulnerability classified as problematic was found in kazeburo Monoceros up to 0.29. This impacts the function sysread of the component Request Body Reader. The manipulation of the argument Content-Length results in resource consumption. This vulnerability was named CVE-2026-115864. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in kazeburo Monoceros up to 0.29. Affected is the function sysread of the component Request Body Reader. The manipulation of the argument Content-Length with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource. This is going to have an impact on availability. CVE summarizes:

Monoceros versions before 0.30 for Perl allow a request declaring a large Content-Length to kill a worker by exhausting memory. The request body is read in a loop that asks sysread for all of the remaining declared length at once. Perl grows the read buffer to that size before any data arrives, so a length larger than available memory makes the worker exit with an uncatchable out of memory error before the application is called. A remote attacker can force a worker restart with each request of a few bytes.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-115864 since 10/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 0.30 eliminates this vulnerability.

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Productinfo

Vendor

• kazeburo

Name

• Monoceros

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29

Website

• Product: https://github.com/kazeburo/Monoceros/

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