CVE-2026-41433Public exploit

Host file overwrite via untrusted TMPDIR

Published Apr 24, 2026 · Updated Apr 24, 2026

Path traversal in OpenTelemetry eBPF Instrumentation 0.4.0 through 0.7.x allows local users to overwrite host files via Java injection. The findTempDir and dirOK logic joins a target-controlled absolute TMPDIR to /proc//root, discarding that boundary, while copyAgent follows symlinks and truncates the selected destination. Exploitation requires control of a local Java workload, enabled Java injection, and elevated OBI privileges; it permits overwriting files writable by OBI.

CVSS severity8.4
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in OpenTelemetry eBPF Instrumentation 0.4.0 through 0.7.x allows local users to overwrite host files via Java injection. The findTempDir and dirOK logic joins a target-controlled absolute TMPDIR to /proc//root, discarding that boundary, while copyAgent follows symlinks and truncates the selected destination. Exploitation requires control of a local Java workload, enabled Java injection, and elevated OBI privileges; it permits overwriting files writable by OBI.

The record

CVE
CVE-2026-41433
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
OpenTelemetry
Product
OpenTelemetry eBPF Instrumentation
Classifications
CWE-59, CWE-22, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.4.0, < 0.8.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenTelemetry · OpenTelemetry eBPF Instrumentationversion=>= 0.4.0, < 0.8.0

Published CVSS scores

8.4GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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