PatchSiren cyber security CVE debrief

CVE-2026-49328 Apache Software Foundation CVE debrief

Apache Fesod (Incubating) fesod-sheet versions prior to 2.0.2-incubating contain a Server-Side Request Forgery (SSRF) vulnerability in the UrlImageConverter component. The flaw allows attackers to supply arbitrary image URLs that trigger outbound network requests from the server to internal or restricted resources. This can enable unauthorized access to internal services, cloud metadata endpoints, or other infrastructure not directly exposed to attackers. The vulnerability is classified as CWE-918 (Server-Side Request Forgery). The Apache security team has released version 2.0.2-incubating to address this issue.

Vendor: Apache Software Foundation
Product: Apache Fesod (Incubating)
CVSS: MEDIUM 5.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-01
Original CVE updated: 2026-06-01
Advisory published: 2026-06-01
Advisory updated: 2026-06-01

Who should care

Organizations running Apache Fesod (Incubating) fesod-sheet versions prior to 2.0.2-incubating, particularly those hosting the application in cloud environments where metadata service access could lead to credential compromise or infrastructure takeover.

Technical summary

The UrlImageConverter component in Apache Fesod (Incubating) fesod-sheet before 2.0.2-incubating fails to properly validate or restrict user-supplied image URLs, allowing attackers to coerce the server into making requests to arbitrary destinations including internal networks and restricted resources. This SSRF vulnerability (CWE-918) can be exploited to scan internal infrastructure, access cloud metadata services, or interact with services not intended to be externally reachable. The fix in version 2.0.2-incubating addresses the insufficient URL validation in the image conversion workflow.

Defensive priority

high

Recommended defensive actions

Upgrade Apache Fesod (Incubating) fesod-sheet to version 2.0.2-incubating or later
Review application logs for anomalous outbound requests from the UrlImageConverter component, particularly to internal IP ranges or cloud metadata endpoints (169.254.169.254)
Implement network segmentation to restrict server-initiated outbound connections to only necessary destinations
Consider deploying SSRF-specific mitigations such as URL validation, deny lists for internal/reserved IP ranges, and use of a dedicated proxy for external image fetching
Monitor for signs of internal reconnaissance or unauthorized access to internal services if exploitation is suspected

Evidence notes

CVE published 2026-06-01. Vendor references include Apache download page, GitHub pull request #917, release tag 2.0.2-incubating, and Apache mailing list thread. Weakness source: [email protected] (CWE-918).

Official resources

2026-06-01