Buffer overflow in Openppl Ppl.nn
CVE-2026-122189
A vulnerability has been found in OpenPPL ppl.nn up to bb84dc9952809b3a5a0036858a3d9f68af1c83d5. The affected element is the function OptGraph::InitQuantization of the file src/ppl/nn/engines/cuda/optimizer/opt_graph.cc of the component CUDA Optimizer. Such manipulation of the argument per_channel/bit_width/tensor_max/tensor_min/scale leads to out-of-bounds read. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. This product does not use versioning. This is why information about affected and unaffected releases are unavailable. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (15.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
- Openppl Ppl.nn — versions bb84dc9952809b3a5a0036858a3d9f68af1c83d5
Weakness classification (CWE)
References
- github.com/OpenPPL/ppl.nn/ (product)
- github.com/OpenPPL/ppl.nn/issues/975 (issue-tracking)
- github.com/user-attachments/files/33393000/poc.zip (exploit)
- vuldb.com/cve/CVE-2026-122189 (third-party-advisory)
- vuldb.com/submit/1028313 (third-party-advisory)
- vuldb.com/vuln/431163 (technical-description, vdb-entry)
- vuldb.com/vuln/431163/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-122189?
- CVE-2026-122189 is a medium-severity vulnerability in Openppl Ppl.nn, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.3/10. Published 2026-11-05.
- How severe is CVE-2026-122189?
- Medium severity. CVSS v3 base score is 6.3 out of 10.