How severe is CVE-2026-29181?

CVE-2026-29181 has a CVSS 3.x base score of 7.5, rated high 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 high.

Is CVE-2026-29181 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29181?

CVE-2026-29181 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29181?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-29181 have an EU (EUVD) identifier?

Yes. CVE-2026-29181 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19938.

When was CVE-2026-29181 published?

CVE-2026-29181 was published on 2026-04-07 and last updated on 2026-06-30.

CVE-2026-29181

CVE-2026-29181 is a high-severity vulnerability in Opentelemetry with a CVSS 3.x base score of 7.5. 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19938
Weakness: CWE-770
Affected product: Opentelemetry
Published: 2026-04-07
Last modified: 2026-06-30

Description

OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header extraction parses each header field-value independently and aggregates members across values. This allows an attacker to amplify cpu and allocations by sending many baggage: header lines, even when each individual value is within the 8192-byte per-value parse limit. This vulnerability is fixed in 1.41.0.

Frequently asked questions

What is CVE-2026-29181?: OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header extraction parses each header field-value independently and aggregates members across values. This allows an attacker to amplify cpu and allocations by sending many baggage: header lines, even when each individual value is within the 8192-byte per-value parse limit. This vulnerability is fixed in 1.41.0.
How severe is CVE-2026-29181?: CVE-2026-29181 has a CVSS 3.x base score of 7.5, rated high 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 high.
Is CVE-2026-29181 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29181?: CVE-2026-29181 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29181?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-29181 have an EU (EUVD) identifier?: Yes. CVE-2026-29181 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19938.
When was CVE-2026-29181 published?: CVE-2026-29181 was published on 2026-04-07 and last updated on 2026-06-30.

References

Affected products (1)

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

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