Medium severity · published Apr 23, 2026
CVE-2026-41078
OpenTelemetry dotnet: Potential memory exhaustion via unbounded pooled-list sizing in Jaeger exporter conversion path
5.9
CVSS
0.2%
EPSS
No
On KEV
Description
OpenTelemetry dotnet is a dotnet telemetry framework. In 1.6.0-rc.1 and earlier, OpenTelemetry.Exporter.Jaeger may allow sustained memory pressure when the internal pooled-list sizing grows based on a large observed span/tag set and that enlarged size is reused for subsequent allocations. Under high-cardinality or attacker-influenced telemetry input, this can increase memory consumption and potentially cause denial of service. There is no plan to fix this issue as OpenTelemetry.Exporter.Jaeger was deprecated in 2023.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenTelemetry.Exporter.Jaeger · open-telemetry
<= 1.6.0-rc.1 · source: vendor
OP
opentelemetry-dotnet · open-telemetry
<= 1.6.0-rc.1 · source: vendor
OP
Opentelemetry · Opentelemetry
before 1.6.0; 1.6.0; 1.6.0; 1.6.0; 1.6.0; 1.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41078
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41078
Vendor Advisory
https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-38h3-2333-qx47
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