Quick answers
- Is CVE-2026-26456 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-26456 being exploited in the wild.
- How severe is CVE-2026-26456?
- High severity, with a CVSS score of 7.5, published 27 August 2026.
- Which products and versions are affected?
- Ipflavors Ccoap commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5.
- Is there a fix for CVE-2026-26456?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-26456 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-26456?
- Check whether you run Ipflavors Ccoap at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A null pointer dereference vulnerability exists in ccoap's server-side session management due to a race condition between the request dispatch thread and the session cleanup thread. The threads access shared session list nodes without proper synchronization; one thread may dereference a session pointer while another concurrently clears the same node's data pointer. This results in a segmentation fault when the first thread attempts to access the now-null pointer. A remote attacker can trigger the race condition by sending specially crafted or timed CoAP requests, causing a denial-of-service. No patch is currently referenced in available advisories.
Affected products
- ipflavors ccoap commit 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5
Timeline
- 2026-08-27: disclosed