CVE-2026-52836 Denial of service in OpenDDS
A remote attacker can crash OpenDDS participants by sending malformed RTPS UDP submessages, causing a denial of service.
- 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-2026-52836?
CVE-2026-52836 is a high-severity denial of service vulnerability in OpenDDS, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OpenDDS is an open source C++ implementation of the Object Management Group (OMG) Data Distribution Service (DDS). Prior to 3.34.0, a network attacker can crash a reachable OpenDDS participant by sending a malformed RTPS UDP submessage whose crafted length or sequence-number state causes dds/DCPS/transport/rtps_udp/RtpsUdpReceiveStrategy.cpp in RtpsUdpReceiveStrategy::handle_input() to advance ACE_Message_Block::rd_ptr() beyond valid data. The parser can then call dds/DCPS/transport/rtps_udp/RtpsSampleHeader.cpp in RtpsSampleHeader::init(), which dereferences the invalid read pointer without first validating it against wr_ptr() or ensuring that a complete submessage header remains. The resulting SIGSEGV occurs in the receive thread, terminates the DDS process, and destroys the DDS entities hosted by that participant. No authentication, prior protocol state, or victim interaction is required. This issue is fixed in version 3.34.0.
Weakness: CWE-125
Which versions are affected by CVE-2026-52836?
How do I fix CVE-2026-52836?
No fix has been published for CVE-2026-52836 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-2026-52836 being exploited?
There is no known exploitation of CVE-2026-52836 in the wild and no public exploit code.
Sources
Also known as GHSA-wcr7-gccq-vv56.