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CVE-2026-94093

DLR-RM stable-baselines3 save_util.py VecNormalize.load deserialization

CVSS 4.0 5.3 MEDIUMCVSS 3.1 6.3 MEDIUMCVSS 3.0 6.3 MEDIUMCVSS 2.0 7.5 Check source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-94093

Published

A security vulnerability has been detected in DLR-RM stable-baselines3 up to 2.9.0. This affects the function PPO.load/load_replay_buffer/VecNormalize.load of the file save_util.py. Such manipulation leads to deserialization. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. In v2.9.0 the PyTorch tensor load path is hardened (weights_only=True), but that hardening was later reverted on master via PR #1913 "Hotfix: revert loading with weights_only=True" [blocked] to fix PyTorch 1.13 compat - so even the one "safe" path is inconsistent across versions. #2281 was closed as a duplicate of #1831 since both are unsafe pickle deserialization - but #1831's fix (PR #41) only gated the Hugging Face Hub loader in the separate huggingface_sb3 package. This finding covers the core stable_baselines3 load APIs (PPO.load, load_replay_buffer, VecNormalize.load), which have no safe mode or gate and remained exploitable in v2.9.0 until the outstanding hardening (PR #2264) ships.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-94093

Published

stable-baselines3

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "DLR-RM",
                    "product": "stable-baselines3",
                    "versions": [
                        {
                            "version": "2.0",
                            "status": "affected"
                        },
                        {
                            "version": "2.1",
                            "status": "affected"
                        },
                        {
                            "version": "2.2",
                            "status": "affected"
                        },
                        {
                            "version": "2.3",
                            "status": "affected"
                        },
                        {
                            "version": "2.4",
                            "status": "affected"
                        },
                        {
                            "version": "2.5",
                            "status": "affected"
                        },
                        {
                            "version": "2.6",
                            "status": "affected"
                        },
                        {
                            "version": "2.7",
                            "status": "affected"
                        },
                        {
                            "version": "2.8",
                            "status": "affected"
                        },
                        {
                            "version": "2.9.0",
                            "status": "affected"
                        }
                    ],
                    "cpes": [
                        "cpe:2.3:a:dlr-rm:stable-baselines3:*:*:*:*:*:*:*:*"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

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