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.
CVE-2026-33701
“—” beside the score: it is equal to NVD's CVSS score.
Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-25. NVD baseline CVSS 9.8; sources differ by 0.0.
Also known asEUVD-2026-16498 (ENISA EUVD) · GHSA-xw7x-h9fj-p2c7 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 9.8
- EG Score
- 9.8CRITICALmedium confidence
- EG Risk
- 59EG Risk 59/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity98% × 45%Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.9% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.9%
- EPSS %ILE
- 60th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.9% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
March 27, 2026
Last Modified
August 17, 2026
Advisory Details (6)
Auto-updated Oct 31, 2026Version 2.26.1
Patch available: open-telemetry/opentelemetry-java-instrumentation v2.26.1
https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.26.1commit 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/9cf4fbaaa9e79226142b2ed42a6f6b4ac0be2197Unsafe 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-p2c72452071 – (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=2452071CVE-2026-33701 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a
https://access.redhat.com/security/cve/CVE-2026-33701Vendor Advisories for CVE-2026-33701(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(1)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| maven | io.opentelemetry.javaagent:opentelemetry-javaagent @ 2.26.1 (fixes < 2.26.1) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
Maven(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| io.opentelemetry.javaagent:opentelemetry-javaagent | 0.12.0 ... 2.9.0 (106 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 17× in last 7d / 59× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 97 of 171 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 74 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-11-02 07:34 UTCEG score recompute
- 2026-11-02 07:34 UTCGHSA enrichmentGHSA-xw7x-h9fj-p2c7 · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-11-01 09:23 UTCGHSA enrichmentGHSA-xw7x-h9fj-p2c7 · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-11-01 07:53 UTCGHSA enrichmentGHSA-xw7x-h9fj-p2c7 · GitHub severity CRITICAL · GitHub CVSS 9.8
- 2026-11-01 07:53 UTCEG score recompute
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-10-31 11:12 UTCEG score recompute
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-10-30 13:01 UTCEG score recompute
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-10-28 16:40 UTCEG score recompute
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-10-27 18:28 UTCEG score recompute
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-10-26 20:15 UTCEG score recompute
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-10-25 20:07 UTCEG score recompute
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.9% · 60th percentile
- 2026-10-25 14:34 UTCEG score recompute
- 2026-10-24 21:56 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 1.2% · 68th percentile
- 2026-10-23 23:45 UTCEG score recompute
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 1.1% · 65th percentile
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- 2026-10-23 01:27 UTCEG score recompute
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-22 02:29 UTCEG score recompute
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-21 04:13 UTCEG score recompute
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-20 06:01 UTCEG score recompute
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-19 07:49 UTCEG score recompute
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-18 03:46 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-17 11:16 UTCEG score recompute
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-16 13:04 UTCEG score recompute
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-15 14:50 UTCEG score recompute
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 1.1% · 65th percentile
- 2026-10-14 09:19 UTCEG score recompute
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-13 06:38 UTCEG score recompute
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-12 16:13 UTCEG score recompute
- 2026-10-11 19:55 UTCEG score recompute
- 2026-10-11 17:08 UTCEG score recompute
- 2026-10-11 14:35 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-09-23 04:02 UTCOSV refresh
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-09-03 22:46 UTCOSV refresh
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.9% · 57th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.9% · 58th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.9% · 57th percentile
Related CVEs(same product + same CWE)
Same product
2 shownMaven:io.opentelemetry.javaagent:opentelemetry-javaagent
Frequently asked(5)
What is CVE-2026-33701?
When was the CVE record for CVE-2026-33701 published?
Is CVE-2026-33701 actively exploited?
What is the CVSS score of CVE-2026-33701?
How do I remediate CVE-2026-33701?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33701
Is Your Infrastructure Affected by CVE-2026-33701?
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