How severe is CVE-2026-39882?

CVE-2026-39882 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-2026-39882 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39882?

CVE-2026-39882 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39882?

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

Does CVE-2026-39882 have an EU (EUVD) identifier?

Yes. CVE-2026-39882 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20628.

When was CVE-2026-39882 published?

CVE-2026-39882 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-39882

CVE-2026-39882 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% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20628
Weakness: CWE-789
Affected product: Opentelemetry
Published: 2026-04-08
Last modified: 2026-06-17

Description

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to 1.43.0, the otlp HTTP exporters (traces/metrics/logs) read the full HTTP response body into an in-memory bytes.Buffer 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 1.43.0.

Frequently asked questions

What is CVE-2026-39882?: OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to 1.43.0, the otlp HTTP exporters (traces/metrics/logs) read the full HTTP response body into an in-memory bytes.Buffer 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 1.43.0.
How severe is CVE-2026-39882?: CVE-2026-39882 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-2026-39882 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39882?: CVE-2026-39882 affects Opentelemetry. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39882?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39882 have an EU (EUVD) identifier?: Yes. CVE-2026-39882 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20628.
When was CVE-2026-39882 published?: CVE-2026-39882 was published on 2026-04-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*

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