CVE-2026-33701

CRITICALNVD 9.89.8
EchelonGraph scoreLOW confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 without applying serialization filters. On JDK version 16 and earlier, an attacker with network access to a JMX or RMI port on an instrumented JVM could exploit this to potentially achieve remote code execution. All three of the following conditions must be true to exploit this vulnerability: First, OpenTelemetry Java instrumentation is attached as a Java agent (-javaagent) on Java 16 or earlier. Second, JMX/RMI port has been explicitly configured via -Dcom.sun.management.jmxremote.port and is network-reachable. Third, gadget-chain-compatible library is present on the classpath. This results in arbitrary remote code execution with the privileges of the user running the instrumented JVM. For JDK >= 17, no action is required, but upgrading is strongly encouraged. For JDK < 17, upgrade to version 2.26.1 or later. As a workaround, set the system property -Dotel.instrumentation.rmi.enabled=false to disable the RMI integration.

CVSS v3
9.8
EG Score
9.8(low)
EPSS
56.6%
KEV
Not listed

Published

March 27, 2026

Last Modified

June 30, 2026

Advisory Details (6)

Auto-updated Jul 12, 2026
Patch available. Sources: github, redhat, github_commit, github_release.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33701.json
redhat

2452071 – (CVE-2026-33701) CVE-2026-33701 io.opentelemetry.javaagent/opentelemetry-javaagent: OpenTelemetry Java Instrumentation: Remote code execution via deserialization vulnerability in RMI

https://bugzilla.redhat.com/show_bug.cgi?id=2452071
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-33701
github Patch Available

Unsafe deserialization in RMI instrumentation may lead to remote code execution · Advisory · open-telemetry/opentelemetry-java-instrumentation · GitHub

https://github.com/open-telemetry/opentelemetry-java-instrumentation/security/advisories/GHSA-xw7x-h9fj-p2c7
github_release Patch Available

Version 2.26.1

Patch available: open-telemetry/opentelemetry-java-instrumentation v2.26.1

https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.26.1
github_commit

commit 9cf4fbaaa9e7 (open-telemetry/opentelemetry-java-instrumentation)

Fix landed in open-telemetry/opentelemetry-java-instrumentation commit 9cf4fbaaa9e7 — awaiting tagged release

https://github.com/open-telemetry/opentelemetry-java-instrumentation/commit/9cf4fbaaa9e79226142b2ed42a6f6b4ac0be2197

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
io.opentelemetry.javaagent:opentelemetry-javaagent0.12.0 ... 2.9.0 (106 versions)2.26.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 15× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:15 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-01 15:06 UTCEPSS rescore
  13. 2026-06-30 23:22 UTCEPSS rescore
  14. 2026-06-30 04:32 UTCEG score recompute
  15. 2026-06-30 04:32 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-33701?
CVE-2026-33701 is a critical vulnerability published on March 27, 2026. 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 without applying serialization filters. On JDK version 16 and…
When was CVE-2026-33701 disclosed?
CVE-2026-33701 was first published in the National Vulnerability Database on March 27, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33701 actively exploited?
CVE-2026-33701 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 56.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33701?
CVE-2026-33701 has a CVSS v3 base score of 9.8 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-33701?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33701, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33701

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