OpenTelemetry Python API Vulnerability in SDK
CVE-2026-126360

5.3MEDIUM

Key Information:

Vendor

Open-telemetry

Status
Opentelemetry-python
Vendor
CVE Published:
12 November 2026

What is CVE-2026-126360?

Prior to version 1.45.2, the OpenTelemetry Python SDK's TraceContextTextMapPropagator.extract() method could be exploited through specifically crafted traceparent values. An attacker, utilizing an appropriately compromised data carrier, could trigger excessive CPU usage by causing quadratic-time regular-expression backtracking on malformed inputs. This could negatively impact performance on asynchronous servers by delaying unrelated requests. This issue has been addressed in version 1.45.2 of the SDK, which mitigates the exploitation vectors.

Affected Version(s)

opentelemetry-python < 1.45.2

References

https://github.com/open-telemetry/opentelemetry-python/se...
x_refsource_CONFIRM
https://github.com/open-telemetry/opentelemetry-python/pu...
x_refsource_MISC
https://github.com/open-telemetry/opentelemetry-python/pu...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.