Skip to main content
Live Webinar with SANS (June 25)— Agentic CTI Automation for Fun & ProfitRegister Free
Mallory
Back to vulnerabilities
Medium

SSRF in Apache Fesod UrlImageConverter

IdentifiersCVE-2026-49328CWE-918· Server-Side Request Forgery (SSRF)

CVE-2026-49328 is a server-side request forgery (SSRF) vulnerability in the UrlImageConverter component of Apache Fesod (Incubating) fesod-sheet before version 2.0.2-incubating. The flaw is caused by improper validation of a user-supplied image URL. By providing a crafted URL to functionality that causes UrlImageConverter to fetch remote image content, an attacker can induce the server to make outbound requests to attacker-chosen destinations, including internal or otherwise restricted network resources that are not directly reachable from the attacker.

Share:
For your environment

Are you exposed to this one?

Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.

Start free trial
ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an attacker to use the vulnerable server as a proxy to send outbound requests to internal or restricted resources. This can enable internal network probing, access to private services or cloud metadata-style endpoints if reachable from the server, and exposure of systems behind firewalls or network segmentation controls. The available content does not state arbitrary code execution or privilege escalation.

Mitigation

If you can’t patch tonight, do this now.

If immediate upgrade is not possible, restrict outbound network connectivity from hosts running the vulnerable component so they cannot reach internal-only or otherwise sensitive destinations except where explicitly required. Apply localized firewall or egress-filtering controls, monitor for unusual outbound requests initiated by the application, and reduce exposure of features that accept untrusted image URLs until the fixed version is deployed.

Remediation

Patch, then assume compromise.

Upgrade Apache Fesod (Incubating) fesod-sheet to version 2.0.2-incubating or later. According to the provided content, version 2.0.2-incubating fixes the issue by introducing stricter validation logic for user-supplied parameters, including the image URL handling in UrlImageConverter.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Apache Software FoundationFesodapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

4 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
Start free trial
Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity3

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-49328
NVD
nvd.nist.gov/vuln/detail/CVE-2026-49328
MITRE CWE · CWE-918
Server-Side Request Forgery (SSRF)
Patch
github.com/apache/fesod/pull/917
Vendor Advisory
lists.apache.org/thread/c1pb5b66h02p9tlrnfbwcgcz85v16fkj
Release Notes
github.com/apache/fesod/releases/tag/2.0.2-incubating
openwall.com
openwall.com/lists/oss-security/2026/06/01/4
Product
fesod.apache.org/docs/download