CVE-2026-116589 Datadog dd-trace-py: IAST instrumentation can lead to application DOS
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-116589?
CVE-2026-116589 is a high-severity vulnerability in DataDog dd-trace-py, published on 26 Oct 2026.
Official description
Datadog dd-trace-py is the Datadog Python APM client. From 3.13.0 until 4.15.5, the IAST string-processing instrumentation does not properly handle certain internal errors while old-style % string formatting processes attacker-controlled input. An unhandled error can terminate the Python process and interrupt the work it is handling. Exploitation requires IAST to be enabled, which is not the default, and application code to apply the affected formatting operation to attacker-controlled input. This issue is fixed in version 4.15.5.
Weakness: CWE-248
Which versions are affected by CVE-2026-116589?
2 open source packages ship an affected version, including ddtrace.
| Package | Affected | Fixed in |
|---|---|---|
ddtrace PyPI | From 3.13.0 | 4.15.5 |
ddtrace PyPI | From 3.13.0 | 4.15.5 |
How do I fix CVE-2026-116589?
Upgrade ddtrace to 4.15.5 or later.
Is CVE-2026-116589 being exploited?
There is no known exploitation of CVE-2026-116589 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-ZH61936, GHSA-p3m5-h5v9-vqj6.