Medium 6.3Published Sep 20, 2026

CVE-2026-94093DLR-RM stable-baselines3 save_util.py VecNormalize.load deserialization

Updated under an hour ago (2026-10-19 07:10 UTC)

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Every CVE for DLR-RM stable-baselines3

Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
Weakness (CWE): CWE-502, CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Sep 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

DLR-RM stable-baselines3 dlr-rm:stable-baselines3	2.0; 2.1; 2.2; 2.3; 2.4; 2.5; 2.6; 2.7; and 2 more ranges	CNA record

References

https://vuldb.com/vuln/408021vdb-entry, technical-description
https://vuldb.com/vuln/408021/ctisignature, permissions-required
https://vuldb.com/cve/CVE-2026-94093third-party-advisory
https://vuldb.com/submit/952734third-party-advisory
https://github.com/DLR-RM/stable-baselines3/issues/2281issue-tracking
https://github.com/DLR-RM/stable-baselines3/product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.