CVE-2026-39882: OpenTelemetry-Go is the Go implementation of OpenTelemetry

Q: How do I fix CVE-2026-39882?

opentelemetry: upgrade to 1.43.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-39882 being exploited?

CVE-2026-39882 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39882 affect?

CVE-2026-39882 affects opentelemetry. Severity is medium (CVSS 5.3). 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 ex

Q: How urgent is CVE-2026-39882?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 5.3UPGRADE

CVE-2026-39882 is a medium-severity flaw (CVSS 5.3) affecting opentelemetry. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-789
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: opentelemetry

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 21:17 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

opentelemetry opentelemetry UPGRADE

Affected: < 1.43.0

Fixed in: 1.43.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy opentelemetry || rpm -q opentelemetry || opentelemetry --version

2. UPGRADE to 1.43.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opentelemetry

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opentelemetry

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39882?

opentelemetry: upgrade to 1.43.0. Exact commands for each OS are on this page.

Is CVE-2026-39882 being exploited?

CVE-2026-39882 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39882 affect?

CVE-2026-39882 affects opentelemetry. Severity is medium (CVSS 5.3). 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 ex

How urgent is CVE-2026-39882?

Priority 21/100. No elevated risk signals yet.

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References

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