CVE-2026-29181

HIGH

OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)

Title source: cna
STIX 2.1

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.

References (1)

Scores

CVSS v3 7.5
EPSS 0.0005
EPSS Percentile 16.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (4)
open-telemetry/opentelemetry-go >= 1.36.0, < 1.41.0
opentelemetry/opentelemetry 1.36.0 - 1.41.0
otel/baggage 1.36.0 - 1.41.0Go
otel/propagation 1.36.0 - 1.41.0Go
Published Apr 07, 2026
Tracked Since Apr 08, 2026