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Vulnerability record · CVE-2023-43810 · published 6 October 2023

CVE-2023-43810: Opentelemetry uncontrolled resource consumption vulnerability

Opentelemetry · Opentelemetry

OpenTelemetry, also known as OTel for short, is a vendor-neutral open-source Observability framework for instrumenting, generating, collecting, and exporting telemetry data such as traces, metrics, logs. Autoinstrumentation out of the box adds the label `http_method` that has unbound cardinality. It leads to the server's potential memory exhaustion when many malicious requests are sent. HTTP method for requests can be easily set by an attacker to be random and long. In order to be affected program has to be instrumented for HTTP handlers and does not filter any unknown HTTP methods on the level of CDN, LB, previous middleware, etc. This issue has been patched in version 0.41b0.

7.5 CVSS 3.1 High EPSS 0.69% · top 49.4% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

OpenTelemetry, also known as OTel for short, is a vendor-neutral open-source Observability framework for instrumenting, generating, collecting, and exporting telemetry data such as traces, metrics, logs. Autoinstrumentation out of the box adds the label `http_method` that has unbound cardinality. It leads to the server's potential memory exhaustion when many malicious requests are sent. HTTP method for requests can be easily set by an attacker to be random and long. In order to be affected program has to be instrumented for HTTP handlers and does not filter any unknown HTTP methods on the level of CDN, LB, previous middleware, etc. This issue has been patched in version 0.41b0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/open-telemetry/opentelemetry-python-contrib/commit/6007e0c013071e7f8b9612d3bc68aeb9d600d74e Patch
https://github.com/open-telemetry/opentelemetry-python-contrib/releases/tag/v0.41b0 Release Notes
https://github.com/open-telemetry/opentelemetry-python-contrib/security/advisories/GHSA-5rv5-6h4r-h22v Vendor Advisory
https://github.com/open-telemetry/opentelemetry-python-contrib/commit/6007e0c013071e7f8b9612d3bc68aeb9d600d74e Patch
https://github.com/open-telemetry/opentelemetry-python-contrib/releases/tag/v0.41b0 Release Notes
https://github.com/open-telemetry/opentelemetry-python-contrib/security/advisories/GHSA-5rv5-6h4r-h22v Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-43810), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.