CVE-2026-26453Network attack vector

Remote service crash via unchecked URI_PATH pointer

Published Aug 27, 2026 · Updated Aug 27, 2026

Null pointer dereference in the ccoap CoAP server allows remote attackers to crash the service via a crafted URI_PATH option. The coap_server_handle_session() function passes each URI_PATH data pointer to strncmp() while searching for the "separate" path without rejecting NULL values. A network-reachable server that parses the malformed option terminates with a segmentation fault, interrupting service without reported data exposure or modification.

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

Null pointer dereference in the ccoap CoAP server allows remote attackers to crash the service via a crafted URI_PATH option. The coap_server_handle_session() function passes each URI_PATH data pointer to strncmp() while searching for the "separate" path without rejecting NULL values. A network-reachable server that parses the malformed option terminates with a segmentation fault, interrupting service without reported data exposure or modification.

The record

CVE
CVE-2026-26453
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
network
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 vectornetwork
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)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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