high · 8.2

Datadog dd-trace-py is the Datadog Python APM client.

CVE-2026-116589 · EUVD-2026-110470 · published 26 Oct 2026

How serious is it

Severity: high, CVSS score 8.2 out of 10.
No exploit prediction (EPSS) score yet.
Not on the CISA list of exploited vulnerabilities.
No public exploit in Exploit-DB.

Is your app affected by CVE-2026-116589?

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Who is affected

DataDog dd-trace-py: 3.13.0, < 4.15.5

How to check

Find out whether you run the affected product and which version, then compare it with the versions above.

How to fix

Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.

Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

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.

Check your whole app

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References

Merged from ENISA EUVD. Last updated 27 Oct 2026. All vulnerabilities · RSS · JSON

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