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Fencer Intel
high 7.5

CVE-2026-45686 json

OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI

published 5mo ago modified 3mo ago also EUVD-2026-33959 , GHSA-43g7-cwr8-q3jh , GO-2026-5107

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

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.

Patch / fix

  • go go.opentelemetry.io/obi 0.9.0
  • opentelemetry ebpf_instrumentation 0.9.0
  • opentelemetry opentelemetry_ebpf_instrumentation 0.9.0
  • alloy SLE Module for Basesystem 15 SP7 1.17.1-150700.15.23.1
  • alloy SLES for SAP applications 16.0, SLES 16.0 1.17.0-160000.1.1

suse advisories SUSE-SU-2026:2824-1SUSE-SU-2026:22575-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • alloy openSUSE Leap 16.0 1.17.0-160000.1.1
  • alloy openSUSE Tumbleweed 1.17.0-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21251-1openSUSE-SU-2026:11053-1

Is CVE-2026-45686 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
5mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-43g7-cwr8-q3jh referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go go.opentelemetry.io/obi
>=0.7.0, <0.9.0
0.9.0

Affected products

  • open-telemetry opentelemetry-ebpf-instrumentation

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.