Apache Juneau: Denial of service via unbounded memory allocation in parsers and REST request handling
- 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? →
- 39/100 · 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: partial
Summary
Apache Juneau is affected by a flaw in its MessagePack parser and REST request handling that lets an attacker cause a denial of service. Remotely, without logging in, an attacker can send a few bytes that force a multi-gigabyte memory allocation and crash the service with an out-of-memory error.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Allocation of Resources Without Limits or Throttling vulnerability in Apache Juneau.
The MessagePack parser, which the REST server enables by default, sizes buffers from length values in the input. An unauthenticated client can send a few bytes that force a multi-gigabyte allocation and an OutOfMemoryError, causing denial of service. Related unbounded allocations in REST request handling (multipart uploads and request reader buffers) are fixed at the same time.
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
- Severity8.7/10CVSS 8.7
- No patch0/5No signal
What would change the score
- Would score about 84 if added to CISA KEV
- Would score about 79 if CISA's SSVC rates exploitation active
- Would score about 44 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
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- org.apache.juneau:juneau-marshallMaven
fixed in 9.2.1
- org.apache.juneau:juneau-rest-serverMaven
fixed in 9.2.1
Evidence 1
- Advisory
Corrections
None so far.
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Questions about CVE-2026-73095
Is CVE-2026-73095 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-2026-73095?
org.apache.juneau:juneau-marshall (Maven): before 9.2.1. org.apache.juneau:juneau-rest-server (Maven): before 9.2.1.Source: cve.now feed data
How do I fix CVE-2026-73095?
Upgrade to a fixed version: 9.2.1.Source: cve.now feed data