CVE-2026-6009
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedJava Deserialisation Vulnerability in Jaspersoft Reports Library leads to Remote Code Execution (RCE), potentially allowing code execution on the affected system
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is a Java deserialization vulnerability in the Jaspersoft Reports Library that allows remote code execution. The vulnerability stems from unsafe deserialization of untrusted data, enabling attackers to inject malicious serialized objects that execute arbitrary code when deserialized by the vulnerable application.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Jaspersoft installationLook for Jaspersoft processes or services running on the system (e.g., 'jasperserver', 'jasperm report', 'tibcojasper' in process lists), or check common installation directories such as /opt/jasperreports-server, /opt/tibco, or C:\Program Files\JaspersoftAffected if Jaspersoft Reports Library is not installed on the system
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Determine installed versionCheck for version information in installation directories - look for version.txt, about.txt, or manifest files in the Jaspersoft installation folder, or access the /jasperserver/about page if the web interface is availableAffected if Unable to determine version or version cannot be verified against available patch information
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Identify deserialization endpointsReview web server configuration and Jaspersoft XML config files (such as web.xml, applicationContext.xml) for endpoints or handlers that accept serialized Java objects, particularly those handling REST/SoAP API requests with object parametersAffected if Endpoints accepting serialized Java objects are exposed without authentication or validation filters
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Check deserialization security configurationInspect Jaspersoft configuration files for serialization whitelisting or blacklisting settings - look for properties like 'jserial.filters' or custom deserialization filters in security configuration filesAffected if No serialization filters or whitelisting is configured, allowing untrusted object deserialization
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Assess network exposureVerify if the Jaspersoft web interface or API ports (commonly 8080, 8443, or custom ports) are accessible from untrusted networks or the internetAffected if Jaspersoft services are exposed to untrusted network segments without proper access controls
A user is affected if Jaspersoft Reports Library is installed and accepts untrusted serialized Java data without validation filters or network access controls.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor-provided patch or upgrade to a patched version of Jaspersoft Reports Library. If a patch is unavailable, disable or restrict Java deserialization endpoints and implement deserialization filters to block known gadget chain payloads.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-6009 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-6009 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data