How severe is CVE-2026-44967?

CVE-2026-44967 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-44967 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44967?

CVE-2026-44967 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44967?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44967 have an EU (EUVD) identifier?

Yes. CVE-2026-44967 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36466.

When was CVE-2026-44967 published?

CVE-2026-44967 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-44967

CVE-2026-44967 is a medium-severity vulnerability in Opentelemetry with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-789.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36466
Weakness: CWE-789
Affected product: Opentelemetry
Published: 2026-06-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44967?: 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.
How severe is CVE-2026-44967?: CVE-2026-44967 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-44967 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44967?: CVE-2026-44967 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44967?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44967 have an EU (EUVD) identifier?: Yes. CVE-2026-44967 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36466.
When was CVE-2026-44967 published?: CVE-2026-44967 was published on 2026-06-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:c\+\+:*:*

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