Resource exhaustion in Open-Telemetry Opentelemetry-Go

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.

EPSS: 0.005 (41.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-29181?
CVE-2026-29181 is a high-severity vulnerability in Open-Telemetry Opentelemetry-Go, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-07.
How severe is CVE-2026-29181?
High severity. CVSS v3 base score is 7.5 out of 10.