Quick answers
- Is CVE-2026-73095 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-73095 being exploited in the wild.
- How severe is CVE-2026-73095?
- Informational severity, published 5 November 2026.
- Which products and versions are affected?
- Apache Juneau through 9.2.0.
- Is there a fix for CVE-2026-73095?
- Yes: fixed in 9.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-73095 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-73095?
- Check whether you run Apache Juneau at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 9.2.1
Technical details
The MessagePack parser in Apache Juneau's REST server lacks input validation for buffer size fields, allowing an attacker to specify arbitrarily large allocation sizes. Related unbounded allocations exist in multipart upload and request reader buffer handling. An unauthenticated remote attacker can trigger an OutOfMemoryError via a network request, causing denial of service without requiring authentication or user interaction.
Affected products
- Apache Juneau through 9.2.0
Timeline
- 2026-11-05: disclosed