CVE-2026-41310Network attack vector

Service degradation via unbounded endpoint cache

Published May 6, 2026 · Updated May 6, 2026

Uncontrolled resource consumption in OpenTelemetry.Exporter.Zipkin 1.15.2 and earlier allows remote attackers to degrade availability. For client or producer spans, the exporter derives cache keys from remote endpoint attributes and retains every unique ZipkinEndpoint without a size bound. Sustained high-cardinality endpoint values cause process memory to grow over time and can interrupt the instrumented service.

CVSS severity5.3
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in OpenTelemetry.Exporter.Zipkin 1.15.2 and earlier allows remote attackers to degrade availability. For client or producer spans, the exporter derives cache keys from remote endpoint attributes and retains every unique ZipkinEndpoint without a size bound. Sustained high-cardinality endpoint values cause process memory to grow over time and can interrupt the instrumented service.

The record

CVE
CVE-2026-41310
Published
May 6, 2026
Updated
May 6, 2026
Vendor
OpenTelemetry
Product
OpenTelemetry .NET
Classifications
CWE-770, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenTelemetry · OpenTelemetry .NETversion=<= 1.15.2

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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