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CVE-2026-116694— OpenTelemetry Python: Unbounded memory allocation in Jaeger baggage propagation

Quick assessment

Affected
open-telemetry opentelemetry-python
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 Python 提供了 OpenTelemetry 的 Python API 和 SDK。在 1.45.0 版本之前， 中的 方法在处理入站 baggage（上下文携带数据）值时，未对条目数量、每个条目的字节数或总字节数施加限制。若服务启用了可选的 Jaeger 传播器，当不可信的载体提供大量或过大的值时，可能导致不必要的 CPU 消耗和短暂的堆内存分配，从而在传输层限制未能约束输入的情况下引发拒绝服务（DoS）攻击。常见的 Python HTTP 服务器默认限制在一定程度上降低了实际影响

CVSS 6.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-116694

Vulnerability Information
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Vulnerability Title
OpenTelemetry Python: Unbounded memory allocation in Jaeger baggage propagation
Source: CVE Program / CVE List V5
Vulnerability Description
OpenTelemetry Python provides the Python API and SDK for OpenTelemetry. Prior to 1.45.0, JaegerPropagator.extract() in opentelemetry-propagator-jaeger processes inbound uberctx-* baggage values without entry, per-entry byte, or total-byte limits. Services that enable the optional Jaeger propagator can perform unnecessary CPU work and short-lived heap allocations when an untrusted carrier supplies numerous or oversized values, contributing to denial of service when transport-level limits do not constrain the input. Common default Python HTTP server limits reduce the practical impact, while custom getters, non-HTTP transports, or raised header limits increase exposure. This issue is fixed in version 1.45.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-telemetry opentelemetry-python < 1.45.0 -

II. Public POCs for CVE-2026-116694

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III. Intelligence Information for CVE-2026-116694

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Vendor Pages for CVE-2026-116694 (1)

Other References for CVE-2026-116694 (3)

IV. Related Vulnerabilities

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