Excessive Backtracking Vulnerability in Datadog Python APM Client
CVE-2026-116588

8.7HIGH

Key Information:

Vendor

Datadog

Status
Dd-trace-py
Vendor
CVE Published:
26 October 2026

What is CVE-2026-116588?

The Datadog Python APM client, dd-trace-py, is susceptible to a vulnerability where the default query-string obfuscation regular expression may experience excessive backtracking. This occurs while handling attacker-controlled URL query strings in HTTP span metadata, potentially leading to prolonged CPU usage, increased request latency, and degradation in service availability for integrations that log query strings. The default configuration is affected in versions prior to 3.19.9 and 4.15.6, prompting users to upgrade to the patched versions for improved security and performance.

Affected Version(s)

dd-trace-py >= 1.5.0, < 3.19.9 < 1.5.0, 3.19.9

dd-trace-py >= 4.0.0, < 4.15.6 < 4.0.0, 4.15.6

References

https://github.com/DataDog/dd-trace-py/security/advisorie...
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

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.