CVE-2026-26452

Deferred Deferred - Pending Action

Segmentation Fault in ccoap Due to Invalid COAP Option Parsing

Publication date: 2026-08-27

Last updated on: 2026-09-01

Assigner: MITRE

Description

ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 lcontains a vulnerability in the option parsing logic that causes a segmentation fault when processing COAP messages containing invalid option numbers.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-27

Last Modified

2026-09-01

Generated

2026-09-17

AI Q&A

2026-08-27

EPSS Evaluated

2026-09-15

NVD

CVE-2026-26452

EUVD

EUVD-2026-67095

Affected Vendors & Products

Vendor	Product	Version / Range
ipflavors	ccoap	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

Executive Summary

This vulnerability is a segmentation fault caused by improper handling of invalid option numbers in COAP messages. The ccoap library's option parsing logic fails to reject invalid option numbers, leading to memory corruption or crashes when processing malformed messages.

Detection Guidance

Monitor for segmentation faults in applications using the ccoap library when processing CoAP messages. Check logs for invalid option numbers (outside 1-15, 17, 19, 21) in CoAP messages. Use network monitoring tools to inspect CoAP traffic for malformed packets.

Impact Analysis

The vulnerability can cause application crashes when processing specific COAP messages with invalid option numbers. This may lead to denial of service if the affected system handles such messages.

Compliance Impact

This vulnerability causes segmentation faults due to improper handling of invalid COAP option numbers, which could lead to service disruptions or crashes in systems processing these messages. Such instability may impact compliance with standards like GDPR (requiring data integrity and availability) or HIPAA (requiring reliable system performance for protected health information) if the affected library is used in critical infrastructure.

Mitigation Strategies

Update the ccoap library to a patched version that includes bounds checking and proper error handling. Implement input validation for CoAP messages to reject invalid option numbers. Restrict network access to CoAP services to trusted sources only.

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