CVE-2026-26452

Process crash via invalid CoAP option numbers

Published Aug 27, 2026 · Updated Aug 27, 2026

Denial of service in ccoap allows attackers to crash the process by supplying a CoAP message containing invalid option numbers. The option parsing logic fails to reject an invalid option number before processing it, causing an invalid memory access and segmentation fault. Reachability depends on an application passing attacker-controlled CoAP traffic to the parser; the demonstrated consequence is process termination only.

CVSS severityUnavailable
Unscored
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in ccoap allows attackers to crash the process by supplying a CoAP message containing invalid option numbers. The option parsing logic fails to reject an invalid option number before processing it, causing an invalid memory access and segmentation fault. Reachability depends on an application passing attacker-controlled CoAP traffic to the parser; the demonstrated consequence is process termination only.

The record

CVE
CVE-2026-26452
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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