CVE-2026-41178: OpenTelemetry-Go is the Go implementation of OpenTelemetry

Q: How do I fix CVE-2026-41178?

opentelemetry: upgrade to 1.42.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-41178 being exploited?

CVE-2026-41178 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41178 affect?

CVE-2026-41178 affects opentelemetry. Severity is medium (CVSS 5.3). OpenTelemetry-Go is the Go implementation of OpenTelemetry. Versions 1.41.0 and 1.43.0 removed raw-length rejection and it causes `Parse` to process arbitrarily large/invalid baggage headers and log errors, enabling DoS via oversized inputs

Q: How urgent is CVE-2026-41178?

Priority 30/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-41178 is a medium-severity flaw (CVSS 5.3) affecting opentelemetry. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Versions 1.41.0 and 1.43.0 removed raw-length rejection and it causes `Parse` to process arbitrarily large/invalid baggage headers and log errors, enabling DoS via oversized inputs. Versions 1.42.0 and 1.44.0 fix the issue.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-789
Published	2026-06-04
Last modified	2026-07-22

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

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-04 16:16 UTCPublished CVE record published
2026-07-22 20:10 UTCUpdated Record last modified

opentelemetry opentelemetry UPGRADE

Affected: < 1.42.0 · 1.43.0

Fixed in: 1.42.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.42.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opentelemetry

Note

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

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-2026-41178?

opentelemetry: upgrade to 1.42.0. Exact commands for each OS are on this page.

Is CVE-2026-41178 being exploited?

CVE-2026-41178 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-2026-41178 affect?

CVE-2026-41178 affects opentelemetry. Severity is medium (CVSS 5.3). OpenTelemetry-Go is the Go implementation of OpenTelemetry. Versions 1.41.0 and 1.43.0 removed raw-length rejection and it causes `Parse` to process arbitrarily large/invalid baggage headers and log errors, enabling DoS via oversized inputs

How urgent is CVE-2026-41178?

Priority 30/100. Remotely exploitable, no login, no user action

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References

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