How severe is CVE-2026-40182?

CVE-2026-40182 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-40182 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40182?

CVE-2026-40182 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40182?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40182 have an EU (EUVD) identifier?

Yes. CVE-2026-40182 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25266.

When was CVE-2026-40182 published?

CVE-2026-40182 was published on 2026-04-23 and last updated on 2026-06-17.

CVE-2026-40182

CVE-2026-40182 is a medium-severity vulnerability in Opentelemetry with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-789.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25266
Weakness: CWE-789
Affected product: Opentelemetry
Published: 2026-04-23
Last modified: 2026-06-17

Description

OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.

Frequently asked questions

What is CVE-2026-40182?: OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.
How severe is CVE-2026-40182?: CVE-2026-40182 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-40182 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40182?: CVE-2026-40182 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40182?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40182 have an EU (EUVD) identifier?: Yes. CVE-2026-40182 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25266.
When was CVE-2026-40182 published?: CVE-2026-40182 was published on 2026-04-23 and last updated on 2026-06-17.

References

Affected products (1)

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

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