HOMEVULNERABILITIESCVE-2026-40894
MEDIUM

CVE-2026-40894

CWE-789Published: April 23, 2026· Updated: Apr 28, 2026

5.3
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:5.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40894 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected Vendors & Products

opentelemetry3 products
opentelemetryopentelemetry.apiopentelemetry.extensions.propagators
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/open-telemetry/opentelemetry-dotnet/pull/1048
PATCHhttps://github.com/open-telemetry/opentelemetry-dotnet/pull/3244
PATCHhttps://github.com/open-telemetry/opentelemetry-dotnet/pull/3309
PATCHhttps://github.com/open-telemetry/opentelemetry-dotnet/pull/533
PATCHhttps://github.com/open-telemetry/opentelemetry-dotnet/pull/7061
ADVISORYhttps://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j

All References (6)

→
https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048Issue Tracking · Patch
→
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244Issue Tracking · Patch
→
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309Issue Tracking · Patch
→
https://github.com/open-telemetry/opentelemetry-dotnet/pull/533Issue Tracking · Patch
→
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061Issue Tracking · Patch
→
https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569jVendor Advisory · Mitigation

Quick Facts

CVE IDCVE-2026-40894
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-789
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedApr 23, 2026

Related CVEs (CWE-789)

CVE-2026-28253
8.7
CVE-2026-20048
7.7
CVE-2021-47973
7.5
CVE-2021-47971
7.5
CVE-2026-8485
7.5
CVE-2026-39312
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-40894 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2026-40894·NVD