# CVE-2026-44967: opentelemetry-cpp: OTLP HTTP exporters read unbounded HTTP response

CVE-2026-44967 is fixed in opentelemetry-cpp on 1 platform by DEBIAN-CVE-2026-44967 (version 1.28.0-1), released June 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-44967
- Priority: Routine
- CVSS: 5.3 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 12, 2026
- Weakness: Memory Allocation with Excessive Size Value
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44967

## Description

OpenTelemetry-cpp is the C++ implementation of OpenTelemetry. Prior to release 1.27.0, the OTLP HTTP exporters (traces/metrics/logs) read the full HTTP response into an in-memory vector of bytes without a size cap. This is exploitable for memory exhaustion when the configured collector endpoint is attacker-controlled (or a network attacker can MITM the exporter connection). This vulnerability is fixed in opentelemetry-cpp release 1.27.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | opentelemetry-cpp Debian 14 | 1.28.0-1 | [DEBIAN-CVE-2026-44967](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44967.md) | Jun 12, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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