Medium severity · published Apr 8, 2026
CVE-2026-39882
OpenTelemetry-Go OTLP HTTP exporters read unbounded HTTP response bodies
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
opentelemetry-go · open-telemetry
< 1.43.0 · source: vendor
OP
Opentelemetry · Opentelemetry
before 1.43.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-39882
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-39882
Patch
https://github.com/open-telemetry/opentelemetry-go/pull/8108
Third Party Advisory
https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr-5gcm-pp58
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