Deserialization in Open-telemetry Opentelemetry-java-instrumentation
CVE-2026-33701
OpenTelemetry Java Instrumentation provides OpenTelemetry auto-instrumentation and instrumentation libraries for Java. In versions prior to 2.26.1, the RMI instrumentation registered a custom endpoint that deserialized incoming data withou…
Vulnerability class: Insecure Deserialization
EPSS: 0.002 (43.9th percentile) — read the EPSS interpretation.
Affected products
- Open-telemetry Opentelemetry-java-instrumentation — versions < 2.26.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/open-telemetry/opentelemetry-java-instrumentation/security/advisories/GHSA-xw7x-h9fj-p2c7 (x_refsource_CONFIRM)
- https://github.com/open-telemetry/opentelemetry-java-instrumentation/commit/9cf4fbaaa9e79226142b2ed42a6f6b4ac0be2197 (x_refsource_MISC)
- https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.26.1 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33701?
- CVE-2026-33701 is a vulnerability in Open-telemetry Opentelemetry-java-instrumentation, classified under Deserialization of Untrusted Data. Published 2026-03-27.
- Is CVE-2026-33701 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.