Deserialization in Fujitsu Research Onecompression
CVE-2026-73325
Fujitsu Research's OneCompression library before 1.2.1 contains an unsafe deserialization vulnerability that allows attackers to execute arbitrary code by supplying a crafted model.pt checkpoint file, as QuantizedModelLoader.load_quantized_model_pt() unconditionally calls torch.load with weights_only=False, invoking Python's pickle machinery during deserialization. Attackers can embed malicious __reduce__ methods in a crafted model checkpoint to execute arbitrary Python code, including system commands, when the library loads the file from a caller-selected model directory.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Fujitsu Research Onecompression — versions 0
Weakness classification (CWE)
References
- pypi.org/project/onecomp/ (product, patch)
- pypi.org/project/onecomp/1.2.1/ (product, patch)
- www.vulncheck.com/advisories/fujitsu-onecompression-arbitrary-code-execution-vi… (third-party-advisory)
- github.com/FujitsuResearch/OneCompression/blob/main/SECURITY.md (vendor-advisory)
Frequently asked questions
- What is CVE-2026-73325?
- CVE-2026-73325 is a high-severity vulnerability in Fujitsu Research Onecompression, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2026-08-12.
- How severe is CVE-2026-73325?
- High severity. CVSS v3 base score is 7.8 out of 10.