CVE-2026-31221

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Source
https://cve.org/CVERecord?id=CVE-2026-31221
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31221.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-31221
Aliases
Downstream
Published
2026-05-12T00:00:00Z
Modified
2026-07-08T08:05:02.440763081Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization vulnerability (CWE-502) in the checkpoint loading mechanism. The LightningModule.loadfromcheckpoint() method, which is commonly used to load saved model states, internally calls torch.load() without setting the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the Pickle module. A remote attacker can exploit this by providing a maliciously crafted checkpoint file, leading to arbitrary code execution on the victim's system when the file is loaded.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31221.json",
    "cna_assigner": "mitre"
}
References

Affected packages

Git / github.com/lightning-ai/pytorch-lightning

Affected ranges

Type
GIT
Repo
https://github.com/lightning-ai/pytorch-lightning
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
854037098554a5fbf6ab7c66ae9617987e82911f
Database specific 
{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:lightningai:pytorch_lightning:*:*:*:*:*:python:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "2.6.0"
        }
    ]
}

Affected versions

0.*
0.0.1
0.0.2
0.1.1
0.1.2
0.10.0
0.2
0.2.1
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6
0.4.7
0.4.9
0.5.0
0.5.1
0.5.2
0.5.2.1
0.6.0
0.7.0
0.7.1
0.7.2
0.7.3
0.7.4
0.7.5
0.7.6
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.9.0
1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.1.0
1.1.0rc1
1.1.0rc2
1.2.0
1.2.0rc1
1.2.0rc2
1.3.0
1.3.0rc0
1.3.0rc1
1.3.0rc2
1.3.0rc3
1.4.0
1.4.0rc0
1.4.0rc1
1.4.0rc2
1.5.0
1.5.0rc0
1.5.0rc1
1.6.0
1.6.0rc0
1.6.0rc1
1.7.0
1.7.0rc0
1.7.0rc1
1.8.0
1.8.0rc0
1.8.0rc1
1.8.0rc2
1.9.0
1.9.0rc0
2.*
2.0.0
2.0.0rc0
2.1.0
2.1.0.rc0
2.1.0.rc1
2.2.0
2.2.0.rc0
2.3.0
2.4.0
2.5.0
2.5.0.post0
2.5.0rc0
2.6.0
app/0.*
app/0.6.0rc0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31221.json"