Vulnerability · Published Oct 26, 2026 · Assigned by GitHub_M
CVE-2026-116589Datadog dd-trace-py: IAST instrumentation can lead to application DOS
High 8.2
In plain English
A high-severity security flaw in dd-trace-py from DataDog. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | ddtrace | 4.15.5 | GHSA-p3m5-h5v9-vqj6 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| DataDog | dd-trace-py | >= 3.13.0, < 4.15.5 |
Weakness: CWE-248 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-p3m5-h5v9-vqj6 x_refsource_CONFIRM
- https://github.com/DataDog/dd-trace-py/pull/20786 x_refsource_MISC
- https://github.com/DataDog/dd-trace-py/pull/20823 x_refsource_MISC
- https://github.com/DataDog/dd-trace-py/commit/69dc19853247434ceab83e0c1c4e279a2eb2a3f7 x_refsource_MISC
- https://github.com/DataDog/dd-trace-py/commit/ace972489b57dd020ff52b706bb548a354f2dd69 x_refsource_MISC
- https://github.com/DataDog/dd-trace-py/releases/tag/v4.15.5 x_refsource_MISC