High severity · published May 5, 2026
CVE-2026-39852
Quarkus authorization bypass via semicolon path normalization inconsistency
8.2
CVSS
0.5%
EPSS
No
On KEV
Description
Quarkus is a Java framework for building cloud-native applications. In versions prior to 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2, a path normalization inconsistency between the security layer and the routing layer allows unauthenticated or lower-privileged users to bypass HTTP path-based authorization policies. Quarkus's security layer performs authorization checks on the raw URL path which preserves matrix parameters (semicolons), while RESTEasy Reactive's routing layer strips matrix parameters before matching endpoints. An attacker can append a semicolon and arbitrary text to a request URL (e.g., /api/admin;anything) to bypass policies protecting /api/admin while still routing to the protected endpoint. This issue has been fixed in versions 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QU
quarkus · quarkusio
< 3.20.6.1; >= 3.27.3.0, < 3.27.3.1; >= 3.34.0, < 3.34.7; >= 3.35.0, < 3.35.2 · source: vendor, NVD
C4
Cryostat 4 on RHEL 9 · Red Hat
All versions, or not specified · source: CISA
HH
HawtIO HawtIO 4.4.0 · Red Hat
All versions, or not specified · source: CISA
OS
OpenShift Serverless · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Build of Apache Camel 4.14 for Quarkus 3.27 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat JBoss Enterprise Application Platform Expansion Pack · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift AI (RHOAI) · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Process Automation 7 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat build of Apache Camel 4 for Quarkus 3 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat build of Apicurio Registry 2 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat build of Apicurio Registry 3 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat build of Debezium 3 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39852
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-39852
Vendor Advisory
https://github.com/quarkusio/quarkus/security/advisories/GHSA-rc95-pcm8-65v9
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:11720
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:11721
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:13631
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:17789
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25089
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