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Vulnerability · Published Apr 7, 2026 · Assigned by GitHub_M

CVE-2026-29181OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)

High 7.5

In plain English

A high-severity resource allocation without limits in opentelemetry-go from open-telemetry. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 42.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12golang-opentelemetry-otelno fix listedDEBIAN-CVE-2026-29181
Debian:13golang-opentelemetry-otelno fix listedDEBIAN-CVE-2026-29181
Debian:14golang-opentelemetry-otelno fix listedDEBIAN-CVE-2026-29181
Gogo.opentelemetry.io/otel1.41.0GHSA-mh2q-q3fh-2475
Gogo.opentelemetry.io/otel1.41.0GO-2026-5506
Ubuntu:22.04:LTSgolang-opentelemetry-otelno fix listedUBUNTU-CVE-2026-29181
Ubuntu:24.04:LTSgolang-opentelemetry-otelno fix listedUBUNTU-CVE-2026-29181
Ubuntu:25.10golang-opentelemetry-otelno fix listedUBUNTU-CVE-2026-29181
Ubuntu:26.04:LTSgolang-opentelemetry-otelno fix listedUBUNTU-CVE-2026-29181
Ubuntu:26.10golang-opentelemetry-otelno fix listedUBUNTU-CVE-2026-29181

Affected products (as reported)

VendorProductVersions
open-telemetry opentelemetry-go >= 1.36.0, < 1.41.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References