Quick answers
- Is CVE-2026-102692 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102692 being exploited in the wild.
- How severe is CVE-2026-102692?
- Critical severity, with a CVSS score of 9.1, published 16 October 2026.
- Which products and versions are affected?
- Riot-Os Riot before 2026.07.
- Is there a fix for CVE-2026-102692?
- Yes: fixed in 2026.07. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-102692 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-102692?
- Check whether you run Riot-Os Riot 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.
How to fix
- Fixed in: 2026.07
Technical details
The nanocoap library fails to enforce the 20-bit maximum for CoAP Block2 option values; oversized values pass through coap_get_blockopt() to coap_block_slicer_init(), where block offset multiplication overflows on 32-bit targets. A remote, unauthenticated attacker on the network can send a malicious CoAP Block2 option to trigger out-of-bounds memory access, denial of service, or memory corruption. The fix adds overflow checks and rejects out-of-spec 4-byte options.
Affected products
- RIOT-OS RIOT before 2026.07
Timeline
- 2026-10-16: disclosed
- 2026-07-23: patched