CVE-2026-40894
medium
CVSS v3
5.3
CVSS v4 NEW
—
VIR risk
5.3
Description
OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers
Predictions
Exploit likelihood
63%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| NuGet | OpenTelemetry.Api | >=0.5.0-beta.2,<1.15.3 | 1.15.3 |
| NuGet | OpenTelemetry.Extensions.Propagators | >=1.3.1,<1.15.3 | 1.15.3 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| opentelemetry | opentelemetry | {"startIncluding":"0.5.0","endExcluding":"1.15.3"} | 1.15.3 |
| opentelemetry | opentelemetry.api | {"startIncluding":"0.5.0","endExcluding":"1.15.3"} | 1.15.3 |
| opentelemetry | opentelemetry.extensions.propagators | {"startExcluding":"1.3.0","endExcluding":"1.15.3"} | 1.15.3 |
References
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/533
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j
- https://nvd.nist.gov/vuln/detail/CVE-2026-40894
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3533
- https://github.com/open-telemetry/opentelemetry-dotnet
- https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.15.3
CWEs
CWE-789
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.