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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116588
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-26 22:16:55 UTC
Updated2026-10-26 22:16:55 UTC
DescriptionDatadog 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.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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

Problem Types: CWE-1333 | CWE-1333 CWE-1333: Inefficient Regular Expression Complexity

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS: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/C...
4.0CNADECLARED8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA DataDog Dd-trace-py affected >= 1.5.0, < 3.19.9 Not specified
CNA DataDog Dd-trace-py affected >= 4.0.0, < 4.15.6 Not specified

References

ReferenceSourceLinkTags
github.com/DataDog/dd-trace-py/commit/63ddc3cb07d8813ded7a8b3ab5b8d0f547... [email protected] github.com
github.com/DataDog/dd-trace-py/pull/20880 [email protected] github.com
github.com/DataDog/dd-trace-py/pull/20857 [email protected] github.com
github.com/DataDog/dd-trace-py/pull/20862 [email protected] github.com
github.com/DataDog/dd-trace-py/security/advisories/GHSA-3633-r77q-h3v3 [email protected] github.com
github.com/DataDog/dd-trace-py/releases/tag/v4.15.6 [email protected] github.com
github.com/DataDog/dd-trace-py/releases/tag/v3.19.9 [email protected] github.com
github.com/DataDog/dd-trace-py/commit/83ea39845dd95bfb9b8e247c62b3d22fc5... [email protected] github.com
github.com/DataDog/dd-trace-py/commit/a6d73607ea45ecd67152630f64b0945556... [email protected] github.com
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