CVE-2026-40894OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers
- 5.3MediumCVSS base score
- 0.46%Exploitation in 30 daysEPSS · top 60% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
OpenTelemetry dotnet is a dotnet telemetry framework. In OpenTelemetry.Api 0.5.0-beta.2 to 1.15.2 and OpenTelemetry.Extensions.Propagators 1.3.1 to 1.15.2, The implementation details of the baggage, B3 and Jaeger processing code in the OpenTelemetry.Api and OpenTelemetry.Extensions.Propagators NuGet packages can allocate excessive memory when parsing which could create a potential denial of service (DoS) in the consuming application. This vulnerability is fixed in 1.15.3.
Timeline
ID reserved
By GitHub_M
- 8 days later
· 8 days later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Analyzed | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.46% · top 60% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
open-telemetry · opentelemetry-dotnet
- affected >= 0.5.0-beta.2, < 1.15.3
open-telemetry · OpenTelemetry.Api
- affected >= 0.5.0-beta.2, < 1.15.3
open-telemetry · OpenTelemetry.Extensions.Propagators
- affected >= 1.3.1, < 1.15.3
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- NuGetOpenTelemetry.ApiGHSA-g94r-2vxg-569j (opens in a new tab)
- NuGetOpenTelemetry.Extensions.PropagatorsGHSA-g94r-2vxg-569j (opens in a new tab)
References
References6
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j (opens in a new tab)x_refsource_CONFIRM
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048 (opens in a new tab)x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244 (opens in a new tab)x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309 (opens in a new tab)x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/533 (opens in a new tab)x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-25269 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-g94r-2vxg-569j (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-40894)Record last updated .