Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The ddtrace PyPI package, versions 3.13.0 up to but not including 4.15.5, contains a flaw in its IAST string-processing instrumentation that can cause the Python application process to terminate. An attacker who can send input that reaches an affected string operation in an application with IAST enabled (which is off by default) can crash the process, causing denial of service. Upgrade to ddtrace 4.15.5. If upgrading is not possible, the source suggests disabling IAST (DD_IAST_ENABLED=false).
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.2 | High | 4.0 | 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 | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0033, the 25th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 26 Oct 2026, 21:26 UTC Confirmed by the CVE List
- 31 Oct 2026, 14:07 UTC First seen by agentprime
- 31 Oct 2026, 14:07 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-p3m5-h5v9-vqj6
- OSV: GHSA-p3m5-h5v9-vqj6
- github.com/DataDog/dd-trace-py/security/advisories/GHSA-p3m5-h5v9-vqj6
- nvd.nist.gov/vuln/detail/CVE-2026-116589
- github.com/DataDog/dd-trace-py/pull/20786
- github.com/DataDog/dd-trace-py/pull/20823
- github.com/DataDog/dd-trace-py/commit/69dc19853247434ceab83e0c1c4e279a2eb2a3f7
- github.com/DataDog/dd-trace-py/commit/ace972489b57dd020ff52b706bb548a354f2dd69
- github.com/DataDog/dd-trace-py
- github.com/DataDog/dd-trace-py/releases/tag/v4.15.5