CVE-2026-44967: open-telemetry opentelemetry-cpp
Vulnerability summary
CVE-2026-44967 is a medium (CVSS 5.3) vulnerability in open-telemetry opentelemetry-cpp. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 20.9% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 12-06-2026PublishedVulnerability first disclosed.
- 12-06-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.3MediumCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.30%
Chance of exploitation in the next 30 days
Percentile
21%
Versus all other CVEs
30-day change
+0.09 pp
From 0.21% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- opentelemetry-cppAll versions (No fix recorded) | < 1.28.0-1
Open-telemetry1 product
- opentelemetry-cpp< 1.27.0
Opentelemetry1 product
- opentelemetry< 1.27.0
Ubuntu1 product
- opentelemetry-cppAll versions (No fix recorded)
4 vendors · 4 products
References
8 links- github.com/open-telemetry/opentelemetry-cpp/security/advisories/GHSA-5qhm-4rfp-qqvjX Refsource CONFIRMREPORTVendor Advisory
- github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr-5gcm-pp58X Refsource MISCREPORTNot ApplicableVendor Advisory
