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CVE-2026-29181

Opentelemetry denial of service

7.5 HIGHPublic exploitEPSS 0.87%
  1. Published7 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Opentelemetry≥ 1.36.0 < 1.41.0

Remediation

Fixed in
Opentelemetry≥ 1.41.0

References

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Frequently asked

Is CVE-2026-29181 being actively exploited?

CVE-2026-29181 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.87%.

How severe is CVE-2026-29181?

CVE-2026-29181 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.87% probability of exploitation.

Which products are affected by CVE-2026-29181?

Affected products include Opentelemetry.

How do I fix CVE-2026-29181?

Upgrade affected software to a fixed version, for example Opentelemetry 1.41.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-29181 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.