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.
References9
- github.com/DataDog/dd-trace-py/commit/63ddc3cb07d8813ded7a8b3ab…
- github.com/DataDog/dd-trace-py/commit/83ea39845dd95bfb9b8e247c6…
- github.com/DataDog/dd-trace-py/commit/a6d73607ea45ecd67152630f6…
- github.com/DataDog/dd-trace-py/pull/20857
- github.com/DataDog/dd-trace-py/pull/20862
- github.com/DataDog/dd-trace-py/pull/20880
- github.com/DataDog/dd-trace-py/releases/tag/v3.19.9
- github.com/DataDog/dd-trace-py/releases/tag/v4.15.6
- github.com/DataDog/dd-trace-py/security/advisories/GHSA-3633-r7…
Metrics
- CVSS 4.0
-
8.7
HIGH
Score source: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 41 · as of 8 November 2026
- CWE
- CWE-1333
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.