TI-2026-33428 Aliases CVE-2026-45686 GHSA-43g7-cwr8-q3jh

OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI

HIGH 72CWE-190Published 2026-06-02 · Updated 2026-06-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-190 and the CVSS impact.

Summary

OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. From version 0.7.0 to before version 0.9.0, a remotely reachable integer overflow in OBI's memcached text protocol parser can crash the OBI process and cause denial of service. When parsing memcached storage commands such as set, add, replace, append, prepend, or cas, OBI accepts extremely large <bytes> values and adds the payload delimiter length without checking for overflow. A crafted request with <bytes> set to math.MaxInt or math.MaxInt-1 causes the computed payload length to wrap negative and triggers a runtime panic in LargeBufferReader.Peek. This issue has been patched in version 0.9.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00354 29th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed opentelemetry-ebpf-instrumentation (open-telemetry): 0.9.0go.opentelemetry.io/obi (Go): 0.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
open-telemetry	opentelemetry-ebpf-instrumentation	0.7.0 to before 0.9.0	0.9.0	Patch available	CNA
—	go.opentelemetry.io/obi (Go)	0.7.0 to before 0.9.0	0.9.0	Patch available	GHSA-43g7-cwr8-q3jh

opentelemetry-ebpf-instrumentation Vendoropen-telemetry Affected 0.7.0 to before 0.9.0 Fixed in 0.9.0 Patch available CNA
go.opentelemetry.io/obi (Go) Vendor— Affected 0.7.0 to before 0.9.0 Fixed in 0.9.0 Patch available GHSA-43g7-cwr8-q3jh

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:opentelemetry:ebpf_instrumentation::::::go::*	0.7.0 to before 0.9.0	Vulnerable	open-telemetry

cpe:2.3:a:opentelemetry:ebpf_instrumentation:*:*:*:*:*:go:*:* Versions 0.7.0 to before 0.9.0 Vulnerable ·open-telemetry

Remediation

Fix · CNA opentelemetry-ebpf-instrumentation (open-telemetry) Fixed in 0.9.0
Fix · GHSA-43g7-cwr8-q3jh go.opentelemetry.io/obi (Go) Fixed in 0.9.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-45686
2026-10-03 Alias added: GHSA-43g7-cwr8-q3jh

References

Exploit 1

https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-43g7-cwr8-q3jh

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-45686

Other 2

TI-2026-33427 OpenTelemetry eBPF Instrumentation: MongoDB parser panics on malformed wire messages CVSS 3.1HIGH 7.5
TI-2026-33420 OpenTelemetry eBPF Instrumentation: Postgres BIND parsing can panic on malformed payloads CVSS 3.1HIGH 7.5
TI-2026-33421 OpenTelemetry eBPF Instrumentation: Redis error text is exported in span status messages CVSS 3.1MEDIUM 6.5
TI-2026-33422 OpenTelemetry eBPF Instrumentation: Unbounded BPF internal metrics replay can exhaust CPU CVSS 3.1HIGH 7.5
TI-2026-33423 OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size CVSS 3.1MEDIUM 5.9
TI-2026-33424 OpenTelemetry eBPF Instrumentation: CappedConcurrentHashMap leaks keys after removals CVSS 3.1MEDIUM 5.5

See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences