CVE-2021-39156

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-863 CWE-706

Affected software

Vendor	Product	Versions
istio	istio	< 1.9.8; >= 1.10.0, < 1.10.4; >= 1.11.0, < 1.11.1

References

https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4rThird Party Advisory
https://istio.io/latest/news/security/istio-security-2021-008Vendor Advisory
https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4rThird Party Advisory
https://istio.io/latest/news/security/istio-security-2021-008Vendor Advisory

Timeline

Published: Aug 24, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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