Red Hat build of Quarkus 3.27.5.SP2: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
CVE-2026-87743 is a high-severity incorrect behavior order: authorization before parsing and canonicalization vulnerability in Red Hat build of Quarkus 3.27.5.SP2 from Red Hat, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.52% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Red Hat build of Quarkus 3.27.5.SP2 you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Red Hat | Red Hat build of Quarkus 3.27.5.SP2 | Not specified in the record | Not stated |
| Red Hat | Red Hat build of Quarkus 3.33.3.SP2 | Not specified in the record | Not stated |
| Red Hat | Red Hat OpenShift Dev Spaces 3.31 | Not specified in the record | Not stated |
| Red Hat | Exploit Intelligence | Not specified in the record | Not stated |
| Red Hat | OpenShift Serverless | Not specified in the record | Not stated |
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 | Not specified in the record | Not stated |
| Red Hat | Red Hat build of Apicurio Registry 3 | Not specified in the record | Not stated |
| Red Hat | Red Hat build of Debezium 3 | Not specified in the record | Not stated |
| Red Hat | Red Hat Build of Keycloak | Not specified in the record | Not stated |
| Red Hat | Red Hat Fuse 7 | Not specified in the record | Not stated |
| Red Hat | Red Hat OpenShift AI (RHOAI) | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by CNA (redhat.com).
Official description
A flaw was found in Quarkus HTTP security. An unauthenticated attacker can exploit a discrepancy in how paths are normalized between the security matcher and HTTP request dispatchers. This allows the attacker to craft a URL that the security matcher considers public, but which is then routed to a protected endpoint, leading to an authorization bypass and potential unauthorized access to sensitive information.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.
How developers prevent this class of flaw
- URL Inputs should be decoded and canonicalized to the application's current internal representation before being validated and processed for authorization. Make sure that your application does not decode the same input twice. Such errors could be used to bypass allowlist schemes by introducing dangerous inputs after they have been checked.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in Red Hat build of Quarkus 3.27.5.SP2
- 8.2 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
Recent Incorrect Behavior Order: Authorization Before Parsing and Canonicalization vulnerabilities
- 7.7 High severity
- 8.1 High severity
- 8.1 High severity
- 8.1 High severity
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