High 8.7Published Oct 26, 2026

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

Updated under an hour ago (Oct 28, 2026, 6:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for DataDog dd-trace-py

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-1333
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

DataDog dd-trace-py datadog:dd_trace_py (from the name)	from 1.5.0, < 3.19.9; from 4.0.0, < 4.15.6	CNA record

References

References

https://github.com/DataDog/dd-trace-py/security/advisories/GHSA-3633-r77q-h3v3	x-refsource-confirm
https://github.com/DataDog/dd-trace-py/pull/20857	x-refsource-misc
https://github.com/DataDog/dd-trace-py/pull/20862	x-refsource-misc
https://github.com/DataDog/dd-trace-py/pull/20880	x-refsource-misc
https://github.com/DataDog/dd-trace-py/commit/63ddc3cb07d8813ded7a8b3ab5b8d0f5470e4bfd	x-refsource-misc
https://github.com/DataDog/dd-trace-py/commit/83ea39845dd95bfb9b8e247c62b3d22fc5dce1ce	x-refsource-misc
https://github.com/DataDog/dd-trace-py/commit/a6d73607ea45ecd67152630f64b0945556972ed8	x-refsource-misc
https://github.com/DataDog/dd-trace-py/releases/tag/v3.19.9	x-refsource-misc
https://github.com/DataDog/dd-trace-py/releases/tag/v4.15.6	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.