How severe is CVE-2026-41178?

CVE-2026-41178 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-41178 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41178?

CVE-2026-41178 primarily affects Opentelemetry. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-41178?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-41178 have an EU (EUVD) identifier?

Yes. CVE-2026-41178 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34288.

When was CVE-2026-41178 published?

CVE-2026-41178 was published on 2026-06-04 and last updated on 2026-06-18.

CVE-2026-41178

CVE-2026-41178 is a medium-severity vulnerability in Opentelemetry with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-789.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34288
Weakness: CWE-789
Affected product: Opentelemetry
Published: 2026-06-04
Last modified: 2026-06-18

Description

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.

Frequently asked questions

What is CVE-2026-41178?: 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.
How severe is CVE-2026-41178?: CVE-2026-41178 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-41178 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41178?: CVE-2026-41178 primarily affects Opentelemetry. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-41178?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-41178 have an EU (EUVD) identifier?: Yes. CVE-2026-41178 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34288.
When was CVE-2026-41178 published?: CVE-2026-41178 was published on 2026-06-04 and last updated on 2026-06-18.

References

Affected products (2)

cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*
cpe:2.3:a:opentelemetry:opentelemetry:1.43.0:*:*:*:*:go:*:*

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