EUVD-2026-28222Published

OpenTelemetry .NET Zipkin exporter has unbounded remote endpoint cache leading to memory growth

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

CVE-2026-41310

No KEV entry is attached to this observation; this is not evidence that exploitation is absent.

FIRST EPSS: 0.31 % · percentile 24.11 % · scored 7 Nov 2026.

Observed 07 Nov 2026 16:07:52 UTC · Complete immutable risk JSON

cve-program · CVE-2026-41310

Published

OpenTelemetry.Exporter.Zipkin is the .NET Zipkin exporter for OpenTelemetry. In versions 1.15.2 and earlier, the Zipkin exporter remote endpoint cache accepts unbounded key growth derived from span attributes. In high-cardinality scenarios, a process using Zipkin export for client or producer spans could experience avoidable memory growth under sustained unique remote endpoint values, increasing process memory usage over time and degrading availability. This issue is fixed in version 1.15.3, which introduces a bounded, thread-safe LRU cache for remote endpoints with a fixed maximum size.

Source published: 6 May 2026 20:54:37 UTC
Source modified: 7 May 2026 13:19:12 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

euvd · EUVD-2026-28222

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: May 6, 2026, 8:54:37 PM

dateUpdated: May 7, 2026, 1:19:12 PM

Source published: May 6, 2026, 8:54:37 PM (timezone not stated)
Source modified: May 7, 2026, 1:19:12 PM (timezone not stated)
Observed here: 7 Nov 2026 09:28:59 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

nvd · CVE-2026-41310

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-400 · CWE-770

Original publisher date fields

published: 2026-05-06T22:16:25.643

lastModified: 2026-10-26T19:10:00.163

1 source CPE criteria · context only

cpe:2.3:a:opentelemetry:opentelemetry.exporter.zipkin:*:*:*:*:*:.net:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 6 May 2026 22:16:25 UTC
Source modified: 26 Oct 2026 19:10:00 UTC
Observed here: 27 Oct 2026 10:10:11 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

osv · GHSA-88hf-wf7h-7w4m

Published

### Summary The Zipkin exporter remote endpoint cache accepted unbounded key growth derived from span attributes. In high-cardinality scenarios, this could increase process memory usage over time and degrade availability. ### Details - Introduce a bounded, thread-safe LRU cache for remote endpoints. - Enforce fixed maximum size to prevent unbounded growth. ### Impact - A process using Zipkin export for client/producer spans could experience avoidable memory growth under sustained unique remote endpoint values. ### Resources [#7081](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7081)

Source published: 28 Apr 2026 23:23:28 UTC
Source modified: 8 May 2026 19:51:02 UTC
Observed here: 23 Oct 2026 16:01:25 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Publisher rating · MODERATE