CVE-2025-27911 Denial of service in Seq
Attackers can bypass event size limits in Seq to cause disk exhaustion or out-of-memory crashes, requiring an upgrade to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-27911?
CVE-2025-27911 is a medium-severity denial of service vulnerability in Datalust Seq, published on 11 Mar 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in Datalust Seq before 2024.3.13545. Expansion of identifiers in message templates can be used to bypass the system "Event body limit bytes" setting, leading to increased resource consumption. With sufficiently large events, there can be disk space exhaustion (if saved to disk) or a termination of the server process with an out-of-memory error.
Weakness: CWE-770
Which versions are affected by CVE-2025-27911?
It affects 1 product.
Products include Datalust Seq.
How do I fix CVE-2025-27911?
No fix has been published for CVE-2025-27911 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-2025-27911 being exploited?
There is no known exploitation of CVE-2025-27911 in the wild and no public exploit code.
Other vulnerabilities in Datalust Seq
Sources
Also known as GHSA-q6rx-mvx9-c693.