Medium severity · published Jun 2, 2026
CVE-2026-45681
OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size
5.9
CVSS
0.3%
EPSS
No
On KEV
Description
OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, the per-CPU message-buffer fallback path uses a 256-byte backup buffer but preserves the original payload size, which can be up to 8KB. If a CPU mismatch occurs, OBI can read beyond the fallback buffer and leak adjacent memory into telemetry. This issue has been patched in version 0.9.0.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
opentelemetry-ebpf-instrumentation · open-telemetry
< 0.9.0 · source: vendor
EI
Ebpf Instrumentation · Opentelemetry
before 0.9.0 · source: NVD
Affected product
OP
opentelemetry-ebpf-instrumentation
open-telemetry
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45681
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45681
Product
https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0
Exploit
https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-r6c9-g6q5-qrf9
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