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CVE-2026-26456

HIGH
7.5
CVSS Score
Published: August 27, 2026 at 12:00 AM UTC
Updated: September 8, 2026 at 07:59 PM UTC
1 product affected across 1 vendorCcoap

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

A null pointer dereference vulnerability exists in the server-side session management logic of ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5. The issue is caused by a race condition between the request dispatch thread and the session cleanup thread when accessing shared session list nodes without proper synchronization.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ccoap· Ipflavors
60%
77f55c4b466e99327c24ace8a2913d3ba7e2ccd5

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord
https://github.com/ipflavors/ccoap
Source: cverecord
https://github.com/songxpu/bug_report/blob/master/CoAP/ccoap/VULNERABILITY_REPORT5.md

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-362CWE-476

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