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CVE-2026-116589— Datadog dd-trace-py: IAST instrumentation can lead to application DOS

Quick assessment

Affected
DataDog dd-trace-py
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Datadog dd-trace-py 是 Datadog 的 Python 应用程序性能监控（APM）客户端。在从 3.13.0 到 4.15.5 的版本中，交互式应用安全测试（IAST）的字符串处理插桩在旧式 字符串格式化处理攻击者可控输入时，未能正确处理某些内部错误。未处理的错误可能导致 Python 进程终止，从而中断其正在处理的任务。利用此漏洞需要满足两个条件：启用 IAST（该功能默认未启用），且应用程序代码对攻击者可控的输入执行了受影响的格式化操作。该问题已在版本 4.15.5 中修复。

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1499.006
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I. Basic Information for CVE-2026-116589

Vulnerability Information
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Vulnerability Title
Datadog dd-trace-py: IAST instrumentation can lead to application DOS
Source: CVE Program / CVE List V5
Vulnerability Description
Datadog dd-trace-py is the Datadog Python APM client. From 3.13.0 until 4.15.5, the IAST string-processing instrumentation does not properly handle certain internal errors while old-style % string formatting processes attacker-controlled input. An unhandled error can terminate the Python process and interrupt the work it is handling. Exploitation requires IAST to be enabled, which is not the default, and application code to apply the affected formatting operation to attacker-controlled input. This issue is fixed in version 4.15.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
DataDog dd-trace-py >= 3.13.0, < 4.15.5 -

II. Public POCs for CVE-2026-116589

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116589

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Patches & Fixes for CVE-2026-116589 (4)

Vendor Advisories for CVE-2026-116589 (1)

Vendor Pages for CVE-2026-116589 (1)

IV. Related Vulnerabilities

Same product: dd-trace-py
Same vendor: DataDog
Same weakness: CWE-248