Apache Juneau: Unsafe reflection allows attacker-controlled class initialization during parsing
- Exploited
- No known exploitation
- Fix
- Fixed in 9.2.1
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 9.2.1.
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 40/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: total
Summary
Apache Juneau, a Java library for parsing data, can be made to run static initializer code from any class on the application classpath when it parses input into a java.lang.Class property. An attacker can reach this remotely, without logging in, by sending crafted input, and the impact depends on which classes exist in the deployment.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Improper control of dynamically-loaded code vulnerability in Apache Juneau.
When Apache Juneau parses a value into a property of type java.lang.Class (including parameterized forms), the default class swap loaded the named class with initialization enabled, so input naming a class on the application classpath ran that class's static initializer. The impact depends on the classes present in the deployment.
This issue affects Apache Juneau: through 9.2.0.
Users are recommended to upgrade to version 9.2.1, which fixes the issue.
cve.now Index
- Exploitation0/40No signal
- Exposure20/25No login or user action needed per the CVSS vector, CISA rates it automatable · Unknown: No advisory context yet
- Reach10/20Affects Maven packages
- Severity10/10CVSS 10.0, total technical impact per CISA
- No patch0/5No signal
What would change the score
- Would score about 85 if added to CISA KEV
- Would score about 80 if CISA's SSVC rates exploitation active
- Would score about 45 if advisories confirm default setups are exposed
Impact
- Widely used
24 packages depend on org.apache.juneau:juneau-marshall.Source: deps.dev
What to do
Upgrade to a fixed version: 9.2.1.
Timeline
- CVE published
- First seen by cve.now
- Posted on X by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- org.apache.juneau:juneau-marshallMaven
fixed in 9.2.1
Evidence 1
- Advisory
Corrections
None so far.
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Questions about CVE-2026-73098
Is CVE-2026-73098 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-73098?
org.apache.juneau:juneau-marshall (Maven): before 9.2.1.Source: cve.now feed data
How do I fix CVE-2026-73098?
Upgrade to a fixed version: 9.2.1.Source: cve.now feed data