GHSA-q834-8qmm-v933: OpenTelemetry.Exporter.OpenTelemetryProtocol (CVE-2026-40182)

Package	Ecosystem	Affected	Fixed in
OpenTelemetry.Exporter.OpenTelemetryProtocol	NuGet	>=1.13.1, <1.15.2	1.15.2

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions 1.13.1 up to but not including 1.15.2 of OpenTelemetry.Exporter.OpenTelemetryProtocol are affected. When the OTLP exporter gets an HTTP 4xx or 5xx response over gRPC or HTTP, it reads the full response body into memory with no size limit. An attacker who controls the configured collector endpoint, or who can intercept the connection, could return an extremely large body and exhaust the application's memory, causing denial of service. Upgrade to version 1.15.2 or later, which caps error response reads at 4MiB and reads them only when error logging is enabled.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.3	Medium	3.1	CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0030, the 23rd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:21 UTC First seen by agentprime
31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.