Medium 5.3Published Jun 12, 2026

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

Updated under an hour ago (Oct 26, 2026, 5:20 PM ET)

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It affects open-telemetry opentelemetry-cpp and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for open-telemetry opentelemetry-cpp

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jun 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-telemetry opentelemetry-cpp open_telemetry:opentelemetry_cpp (from the name)	before 1.27.0	CNA record
opentelemetry opentelemetry opentelemetry:opentelemetry	before 1.27.0	NVD

References

References

https://github.com/open-telemetry/opentelemetry-cpp/security/advisories/GHSA-5qhm-4rfp-qqvj	x-refsource-confirm, vendor-advisory
https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr-5gcm-pp58	x-refsource-misc, not-applicable, vendor-advisory
https://github.com/open-telemetry/opentelemetry-cpp/issues/3958	x-refsource-misc, issue-tracking
https://github.com/open-telemetry/opentelemetry-cpp/pull/4078	x-refsource-misc, issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.