CVE-2026-42602: azureauthextension is the Azure Authenticator Extension

Routine

HIGH 8.1UPGRADE

CVE-2026-42602 is a high-severity flaw (CVSS 8.1) affecting opentelemetry collector contrib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

azureauthextension is the Azure Authenticator Extension. From 0.124.0 to 0.150.0, a server-side authentication bypass in azureauthextension allows any party who holds a single valid Azure access token for any scope the collector's configured identity can mint for to authenticate to any OpenTelemetry receiver that uses auth: azure_auth. The extension's Authenticate method does not validate incoming bearer tokens as JWTs. Instead, it calls its own

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-208, CWE-287, CWE-290, CWE-294
Published	2026-05-13
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: opentelemetry

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-13 21:16 UTCPublished CVE record published
2026-10-26 14:10 UTCUpdated Record last modified

opentelemetry opentelemetry collector contrib UPGRADE

Affected: >= 0.124.0 and <= 0.150.0

Fixed in: newer than 0.150.0

Safe to downgrade to: a release before 0.124.0

1. Check installed version

apt-cache policy opentelemetry-collector-contrib || rpm -q opentelemetry-collector-contrib || opentelemetry-collector-contrib --version

2. UPGRADE to newer than 0.150.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opentelemetry-collector-contrib

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opentelemetry-collector-contrib

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.124.0 (Debian / Ubuntu)

apt-cache madison opentelemetry-collector-contrib sudo apt install opentelemetry-collector-contrib=<VERSION_BEFORE_0.124.0> sudo apt-mark hold opentelemetry-collector-contrib

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list opentelemetry-collector-contrib sudo dnf downgrade opentelemetry-collector-contrib-<VERSION_BEFORE_0.124.0> sudo dnf versionlock add opentelemetry-collector-contrib

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42602?

opentelemetry collector contrib: upgrade to newer than 0.150.0. Exact commands for each OS are on this page.

Is CVE-2026-42602 being exploited?

CVE-2026-42602 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42602 affect?

CVE-2026-42602 affects opentelemetry collector contrib. Severity is high (CVSS 8.1). azureauthextension is the Azure Authenticator Extension. From 0.124.0 to 0.150.0, a server-side authentication bypass in azureauthextension allows any party who holds a single valid Azure access token for any scope the collector's configure

How urgent is CVE-2026-42602?

Priority 37/100. High severity; Public exploit reference

Software pages

Azure vulnerabilities

References

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