# CVE-2026-116588: Datadog dd-trace-py: ReDOS in URL query string obfuscation

> CVE-2026-116588: Datadog dd-trace-py: ReDOS in URL query string obfuscation. CVSS 8.7 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-116588
Last updated: 2026-11-02T19:17:56Z

- Published: 2026-10-26 21:22 UTC · Updated: 2026-11-02 19:17 UTC · Assigner: GitHub\_M
- CVSS: 8.7 (CVSS 4.0) · Severity: High
- EPSS: 0.47%, 41th percentile (scored 2026-11-03)
- CISA KEV: no
- CWE: CWE-1333

## Description

Datadog dd-trace-py is the Datadog Python APM client. From 1.5.0 until 3.19.9 and 4.15.6, the default query-string obfuscation regular expression can exhibit excessive backtracking while synchronously processing attacker-controlled URL query strings for HTTP span metadata. A remote attacker can cause prolonged CPU consumption, request latency, and service unavailability in affected HTTP tracing integrations that include query strings in URL span tags. The vulnerable processing is enabled by default for those integrations. This issue is fixed in versions 3.19.9 and 4.15.6.

## 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-2026-116588)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-116588)
- [https://github.com/DataDog/dd-trace-py/commit/63ddc3cb07d8813ded7a8b3ab5b8d0f5470e4bfd](https://github.com/DataDog/dd-trace-py/commit/63ddc3cb07d8813ded7a8b3ab5b8d0f5470e4bfd)
- [https://github.com/DataDog/dd-trace-py/commit/83ea39845dd95bfb9b8e247c62b3d22fc5dce1ce](https://github.com/DataDog/dd-trace-py/commit/83ea39845dd95bfb9b8e247c62b3d22fc5dce1ce)
- [https://github.com/DataDog/dd-trace-py/commit/a6d73607ea45ecd67152630f64b0945556972ed8](https://github.com/DataDog/dd-trace-py/commit/a6d73607ea45ecd67152630f64b0945556972ed8)
- [https://github.com/DataDog/dd-trace-py/pull/20857](https://github.com/DataDog/dd-trace-py/pull/20857)
- [https://github.com/DataDog/dd-trace-py/pull/20862](https://github.com/DataDog/dd-trace-py/pull/20862)
- [https://github.com/DataDog/dd-trace-py/pull/20880](https://github.com/DataDog/dd-trace-py/pull/20880)
- [https://github.com/DataDog/dd-trace-py/releases/tag/v3.19.9](https://github.com/DataDog/dd-trace-py/releases/tag/v3.19.9)
- [https://github.com/DataDog/dd-trace-py/releases/tag/v4.15.6](https://github.com/DataDog/dd-trace-py/releases/tag/v4.15.6)
- [https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-3633-r77q-h3v3](https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-3633-r77q-h3v3)

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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-2026-116588 · Markdown: https://rewindex.com/cve/CVE-2026-116588.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-116588 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T13:58:43.478Z