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PatchSiren cyber security CVE debrief

CVE-2026-44967 open-telemetry CVE debrief

CVE-2026-44967 is a vulnerability in the OpenTelemetry-cpp implementation, specifically affecting its OTLP HTTP exporters for traces, metrics, and logs. Prior to the release of version 1.27.0, these exporters would read the full HTTP response into an in-memory vector of bytes without any size cap. This behavior can be exploited for memory exhaustion when the configured collector endpoint is controlled by an attacker or when a network attacker can perform a man-in-the-middle (MITM) attack on the exporter connection. The vulnerability has been addressed with the release of opentelemetry-cpp version 1.27.0.

Vendor
open-telemetry
Product
opentelemetry-cpp
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-16
Advisory published
2026-06-12
Advisory updated
2026-06-16

Who should care

Users of OpenTelemetry-cpp, especially those who have configured collector endpoints that could be controlled by attackers or are exposed to networks where MITM attacks could occur.

Technical summary

The OTLP HTTP exporters in OpenTelemetry-cpp prior to version 1.27.0 do not limit the size of HTTP responses stored in memory, leading to potential memory exhaustion.

Defensive priority

Medium

Recommended defensive actions

  • Upgrade to OpenTelemetry-cpp version 1.27.0 or later.
  • Validate and limit access to collector endpoints.
  • Implement network security measures to prevent or detect MITM attacks.

Evidence notes

CVE-2026-44967 has a CVSS score of 5.3 and is classified as MEDIUM severity. It was published on 2026-06-12T16:16:27.973Z and modified on 2026-06-12T17:16:23.020Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-44967 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-44967

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-44967 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44967

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.