CVE-2026-116588 Datadog dd-trace-py: ReDOS in URL query string obfuscation
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-116588?
CVE-2026-116588 is a high-severity vulnerability in DataDog dd-trace-py, published on 26 Oct 2026.
Official 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.
Weakness: CWE-1333
Which versions are affected by CVE-2026-116588?
4 open source packages ship an affected version, including ddtrace.
| Package | Affected | Fixed in |
|---|---|---|
ddtrace PyPI | From 1.5.0 | 3.19.9 |
ddtrace PyPI | From 1.5.0 | 3.19.9 |
ddtrace PyPI | From 4.0.0 | 4.15.6 |
ddtrace PyPI | From 4.0.0 | 4.15.6 |
How do I fix CVE-2026-116588?
Upgrade ddtrace to a fixed version for your release line: 3.19.9 or 4.15.6.
Is CVE-2026-116588 being exploited?
There is no known exploitation of CVE-2026-116588 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-OJ63833, GHSA-3633-r77q-h3v3, MINI-w4cm-jcv4-g374.