PatchSiren cyber security CVE debrief

CVE-2026-35253 Oracle CVE debrief

CVE-2026-35253 is a medium-severity vulnerability in Oracle's Macoron Tool, published on 2026-05-06 and last modified on 2026-05-10. The NVD entry identifies version v0.22.0 as affected and describes an unauthenticated network-access attack over HTTP that can cause the tool to fail host address validation. The record was still listed as "Undergoing Analysis" in the provided source corpus at the time of the last modification.

Vendor: Oracle
Product: Macoron
CVSS: MEDIUM 4.7
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-05-06
Original CVE updated: 2026-05-10
Advisory published: 2026-05-06
Advisory updated: 2026-05-10

Who should care

Operators or developers using Oracle Macoron Tool v0.22.0, especially where the service is reachable over HTTP from untrusted networks. Security teams responsible for validating host-address checks and exposure of externally reachable management or application endpoints should prioritize review.

Technical summary

The NVD record maps the issue to CPE cpe:2.3:a:oracle:macoron:0.22.0 and assigns CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N. The weakness is recorded as CWE-601 with a secondary CWE-346 reference. Based on the supplied description, an unauthenticated attacker with network access via HTTP can trigger behavior that causes Oracle Macoron Tool to fail host address validation. The provided corpus does not include exploit details, mitigation steps, or confirmation of broader affected versions beyond v0.22.0.

Defensive priority

Medium. The issue is network-reachable and unauthenticated, but the provided CVSS score is 4.7 and the record does not indicate integrity or availability impact. Treat as a focused validation flaw that should be addressed before exposing the product to untrusted HTTP traffic.

Recommended defensive actions

Verify whether Oracle Macoron Tool v0.22.0 is deployed anywhere in your environment.
Restrict network exposure of any HTTP endpoint associated with the product until Oracle guidance or a fix is applied.
Review host-address validation logic and related request handling for this release line.
Monitor Oracle security advisories and the NVD record for updated remediation guidance.
If the product is not required, remove or disable the exposed instance rather than leaving it reachable over HTTP.

Evidence notes

Claims in this debrief are limited to the supplied NVD record and the Oracle security-alert reference listed there. The corpus identifies the affected CPE as oracle:macoron:0.22.0, the issue as network-accessible over HTTP, and the consequence as failed host address validation. NVD's status in the provided source was "Undergoing Analysis" as of 2026-05-10. No exploit code, proof-of-concept, or vendor patch details were present in the supplied materials.

Sources and references

Verified primary and authoritative sources

CVE-2026-35253 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-35253

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-35253 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-35253

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Source reference
Unverified legacy reference

URL: https://www.oracle.com/security-alerts/all-oracle-cves-outside-other-oracle-public-documents.html

[email protected] - Not Applicable

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.