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CVE-2023-45142— OpenTelemetry-Go Contrib has DoS vulnerability in otelhttp due to unbound cardinality metrics

Quick assessment

Affected
open-telemetry opentelemetry-go-contrib
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenTelemetry-Go Contrib是OpenTelemetry开源的一个 OpenTelemetry Go的扩展集合。 OpenTelemetry-Go Contrib 存在安全漏洞，该漏洞源于当大量恶意请求发送到服务器时，可能会导致服务器内存耗尽。

CVSS 7.5 · High EPSS 1.36% · P71

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2023-45142

Vulnerability Information
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Vulnerability Title
OpenTelemetry-Go Contrib has DoS vulnerability in otelhttp due to unbound cardinality metrics
Source: CVE Program / CVE List V5
Vulnerability Description
OpenTelemetry-Go Contrib is a collection of third-party packages for OpenTelemetry-Go. A handler wrapper out of the box adds labels `http.user_agent` and `http.method` that have unbound cardinality. It leads to the server's potential memory exhaustion when many malicious requests are sent to it. HTTP header User-Agent or HTTP method for requests can be easily set by an attacker to be random and long. The library internally uses `httpconv.ServerRequest` that records every value for HTTP `method` and `User-Agent`. In order to be affected, a program has to use the `otelhttp.NewHandler` wrapper and not filter any unknown HTTP methods or User agents on the level of CDN, LB, previous middleware, etc. Version 0.44.0 fixed this issue when the values collected for attribute `http.request.method` were changed to be restricted to a set of well-known values and other high cardinality attributes were removed. As a workaround to stop being affected, `otelhttp.WithFilter()` can be used, but it requires manual careful configuration to not log certain requests entirely. For convenience and safe usage of this library, it should by default mark with the label `unknown` non-standard HTTP methods and User agents to show that such requests were made but do not increase cardinality. In case someone wants to stay with the current behavior, library API should allow to enable it.
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 Contrib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenTelemetry-Go Contrib是OpenTelemetry开源的一个 OpenTelemetry Go的扩展集合。 OpenTelemetry-Go Contrib 存在安全漏洞，该漏洞源于当大量恶意请求发送到服务器时，可能会导致服务器内存耗尽。
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-contrib < 0.44.0 -

II. Public POCs for CVE-2023-45142

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10461 chars
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III. Intelligence Information for CVE-2023-45142

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Patches & Fixes for CVE-2023-45142 (1)

Vendor Advisories for CVE-2023-45142 (2)

Mailing List Discussions for CVE-2023-45142 (1)

Other References for CVE-2023-45142 (5)

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-45142

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