CVE-2026-41173 | open-telemetry opentelemetry-dotnet-contrib up to 0.1.0-alpha.7 Sampling Endpoint ReadAsStringAsync allocation of resources (GHSA-28xm-prxc-5866 / EUVD-2026-25271)

VDB-359200 · CVE-2026-41173 · GHSA-28XM-PRXC-5866 OPEN-TELEMETRY OPENTELEMETRY-DOTNET-CONTRIB UP TO 0.1.0-ALPHA.7 SAMPLING ENDPOINT READASSTRINGASYNC ALLOCATION OF RESOURCES HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.7 $0-$5k 2.74+ Summaryinfo A vulnerability, which was classified as problematic, was found in open-telemetry opentelemetry-dotnet-contrib up to 0.1.0-alpha.7. The affected element is the function ReadAsStringAsync of the component Sampling Endpoint. Executing a manipulation can lead to allocation of resources. This vulnerability is registered as CVE-2026-41173. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component. Detailsinfo A vulnerability classified as problematic was found in open-telemetry opentelemetry-dotnet-contrib up to 0.1.0-alpha.7. This vulnerability affects the function ReadAsStringAsync of the component Sampling Endpoint. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes: The AWS X-Ray Remote Sampler package provides a sampler which can get sampling configurations from AWS X-Ray. Prior to 0.1.0-alpha.8, OpenTelemetry.Sampler.AWS reads unbounded HTTP response bodies from a configured AWS X-Ray remote sampling endpoint into memory. AWSXRaySamplerClient.DoRequestAsync called HttpClient.SendAsync followed by ReadAsStringAsync(), which materializes the entire HTTP response body into a single in-memory string with no size limit. The sampling endpoint is configurable via AWSXRayRemoteSamplerBuilder.SetEndpoint (default: http://localhost:2000). An attacker who controls the configured endpoint, or who can intercept traffic to it (MitM), 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. This vulnerability is fixed in 0.1.0-alpha.8. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-41173 since 04/17/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499. Upgrading to version 0.1.0-alpha.8 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25271). Productinfo Vendor open-telemetry Name opentelemetry-dotnet-contrib Version 0.1.0-alpha.0 0.1.0-alpha.1 0.1.0-alpha.2 0.1.0-alpha.3 0.1.0-alpha.4 0.1.0-alpha.5 0.1.0-alpha.6 0.1.0-alpha.7 Website Product: https://github.com/open-telemetry/opentelemetry-dotnet-contrib/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.8 VulDB Meta Temp Score: 4.7 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.9 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Allocation of resources CWE: CWE-770 / CWE-400 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: opentelemetry-dotnet-contrib 0.1.0-alpha.8 Patch: github.com Timelineinfo 04/17/2026 CVE reserved 04/23/2026 +6 days Advisory disclosed 04/23/2026 +0 days VulDB entry created 04/24/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-28xm-prxc-5866 Status: Confirmed CVE: CVE-2026-41173 (🔒) GCVE (CVE): GCVE-0-2026-41173 GCVE (VulDB): GCVE-100-359200 EUVD: 🔒 Entryinfo Created: 04/23/2026 23:14 Updated: 04/24/2026 01:19 Changes: 04/23/2026 23:14 (66), 04/24/2026 01:19 (1) Complete: 🔍 Cache ID: 99:F4C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸