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

Quick assessment

Affected
open-telemetry opentelemetry-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenTelemetry-Go是OpenTelemetry - CNCF开源的一个开发者工具包。 OpenTelemetry-Go 1.36.0至1.40.0版本存在安全漏洞，该漏洞源于多值baggage标头提取独立解析每个标头字段值并跨值聚合成员，可能导致攻击者通过发送大量baggage标头行来放大CPU消耗和内存分配。

CVSS 7.5 · High EPSS 0.87% · P57

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-telemetry opentelemetry-go >= 1.36.0, < 1.41.0 affected
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I. Basic Information for CVE-2026-29181

Vulnerability Information
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Vulnerability Title
OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenTelemetry-Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenTelemetry-Go是OpenTelemetry - CNCF开源的一个开发者工具包。 OpenTelemetry-Go 1.36.0至1.40.0版本存在安全漏洞，该漏洞源于多值baggage标头提取独立解析每个标头字段值并跨值聚合成员，可能导致攻击者通过发送大量baggage标头行来放大CPU消耗和内存分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-telemetry opentelemetry-go >= 1.36.0, < 1.41.0 -

II. Public POCs for CVE-2026-29181

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III. Intelligence Information for CVE-2026-29181

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Vendor Advisories for CVE-2026-29181 (1)

IV. Related Vulnerabilities

Same product: opentelemetry-go
Same vendor: open-telemetry
Same weakness: CWE-770

V. Comments for CVE-2026-29181

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