# CVE-2026-116589: Datadog dd-trace-py: IAST instrumentation can lead to application DOS

> CVE-2026-116589: Datadog dd-trace-py: IAST instrumentation can lead to application DOS. CVSS 8.2 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-116589
Last updated: 2026-10-31T02:17:33Z

- Published: 2026-10-26 21:26 UTC · Updated: 2026-10-31 02:17 UTC · Assigner: GitHub\_M
- CVSS: 8.2 (CVSS 4.0) · Severity: High
- EPSS: 0.33%, 26th percentile (scored 2026-11-03)
- CISA KEV: no
- CWE: CWE-248

## 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 vendors and products

- DataDog: dd-trace-py

## Tracked companies

- [Datadog](https://rewindex.com/company/datadog.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-116589)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-116589)
- [https://github.com/DataDog/dd-trace-py/commit/69dc19853247434ceab83e0c1c4e279a2eb2a3f7](https://github.com/DataDog/dd-trace-py/commit/69dc19853247434ceab83e0c1c4e279a2eb2a3f7)
- [https://github.com/DataDog/dd-trace-py/commit/ace972489b57dd020ff52b706bb548a354f2dd69](https://github.com/DataDog/dd-trace-py/commit/ace972489b57dd020ff52b706bb548a354f2dd69)
- [https://github.com/DataDog/dd-trace-py/pull/20786](https://github.com/DataDog/dd-trace-py/pull/20786)
- [https://github.com/DataDog/dd-trace-py/pull/20823](https://github.com/DataDog/dd-trace-py/pull/20823)
- [https://github.com/DataDog/dd-trace-py/releases/tag/v4.15.5](https://github.com/DataDog/dd-trace-py/releases/tag/v4.15.5)
- [https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-p3m5-h5v9-vqj6](https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-p3m5-h5v9-vqj6)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-116589 · Markdown: https://rewindex.com/cve/CVE-2026-116589.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-116589 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T15:24:58.928Z