CVE-2026-9267 Denial of service in Eclipse tinydtls
Unauthenticated attackers can cause denial of service on memory-constrained devices via out-of-bounds reads in Eclipse tinydtls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-9267?
CVE-2026-9267 is a medium-severity denial of service vulnerability in Eclipse tinydtls, published on 29 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Eclipse tinydtls before commit b3efd41ad111a4920f599f51ffa4f5e9f1e72221 contains an out-of-bounds read vulnerability in the check_server_certificate() function that allows unauthenticated attackers to trigger reads beyond valid buffer boundaries by crafting a Certificate handshake message with a specific fragment_length value. Attackers can exploit missing buffer length validation before uint24 reads, memcmp, and memcpy operations during DTLS epoch 0 on both client and server paths to cause denial of service on memory-constrained devices.
Weakness: CWE-125
Which versions are affected by CVE-2026-9267?
How do I fix CVE-2026-9267?
No fix has been published for CVE-2026-9267 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-9267 being exploited?
There is no known exploitation of CVE-2026-9267 in the wild and no public exploit code.
Sources
Also known as GHSA-qqgj-g5f7-jqhm.