GHSA-69w3-r845-3855: transformers (CVE-2026-1839)

Package	Ecosystem	Affected	Fixed in
transformers	PyPI	<5.0.0rc3	5.0.0rc3

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Transformers versions before 5.0.0rc3 are affected by arbitrary code execution through the Trainer class. The _load_rng_state() method calls torch.load() without weights_only=True, and the issue applies when PyTorch is below 2.6. An attacker who supplies a malicious checkpoint file, such as an RNG state file, can run arbitrary code when it is loaded. Upgrade to transformers 5.0.0rc3 or later.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.5	Medium	3.0	CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:H	CNA (@huntr_ai)

CISA KEV Not listed.
EPSS 0.0039, the 33rd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:34 UTC First seen by agentprime
31 Oct 2026, 14:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.