GHSA-55m9-299j-53c7 · Severity: medium · Ecosystem: nuget — OneCollector exporter reads unbounded HTTP response bodies
OpenTelemetry.Exporter.OneCollector is a .NET exporter that sends telemetry to a OneCollector back-end over HTTP. In versions 1.15.0 and earlier, when a request to the configured back-end or collector results in an unsuccessful HTTP 4xx or 5xx response, the HttpJsonPostTransport class reads the entire response body into memory with no upper bound on the number of bytes consumed in order to include the error response in operator logs. An attacker who controls the configured endpoint, or who can intercept traffic to it via a man-in-the-middle attack, can return an arbitrarily large response body. This causes unbounded heap allocation in the consuming process, leading to high transient memory pressure, garbage-collection stalls, or an OutOfMemoryException that terminates the process. As a workaround, use network-level controls such as firewall rules, mTLS, or a service mesh to prevent man-in-the-middle attacks on the configured back-end or collector endpoint. This issue is fixed in version 1.15.1, which limits the number of bytes read from the response body in an error condition to 4 MiB.
Conclusion & alert: CVE-2026-41484 is rated Low Risk (22.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-22 | 0.05% | 0.02% | -0.04% |
| 2 | 2026-05-20 | 0.02% | 0.05% | +0.04% |
| 3 | 2026-05-07 | — | 0.02% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.3 | 3.1 | MEDIUM |
|
1.6 | 3.6 | [email protected] |
| 5.9 | 3.1 | MEDIUM |
|
2.2 | 3.6 | [email protected] |
GHSA-55m9-299j-53c7 · Severity: medium · Ecosystem: nuget — OneCollector exporter reads unbounded HTTP response bodies
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| opentelemetry | opentelemetry.exporter.onecollector | <= 1.15.0 | cpe:2.3:a:opentelemetry:opentelemetry.exporter.onecollector:*:*:*:*:*:.net:*:* |
| URL | Tags |
|---|---|
| https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4117 | Issue Tracking Patch |
| https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-55m9-299j-53c7 | Patch Vendor Advisory Mitigation |