---
title: "CVE-2026-90777: ESPnet - Insecure Deserialization"
description: "ESPnet before 202609 contains an insecure deserialization vulnerability caused by torch.load with weights_only=False in pretrained model checkpoint loading, letting attackers execute arbitrary code via crafted checkpoint files, exploit requires loading malicious files."
url: https://panop.io/threat-heartbeat/CVE-2026-90777/
---

# CVE-2026-90777 ESPnet - Insecure Deserialization

ESPnet before 202609 contains an insecure deserialization vulnerability caused by torch.load with weights\_only=False in pretrained model checkpoint loading, letting attackers execute arbitrary code via crafted checkpoint files, exploit requires loading malicious files.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.73% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90777)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

13 September 2026

Updated

15 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to version 202609 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90777](https://nvd.nist.gov/vuln/detail/CVE-2026-90777)
- [https://github.com/espnet/espnet](https://github.com/espnet/espnet)
- [https://github.com/espnet/espnet/blob/v.202511/espnet2/torch\_utils/load\_pretrained\_model.py#L99](https://github.com/espnet/espnet/blob/v.202511/espnet2/torch_utils/load_pretrained_model.py#L99)
- [https://github.com/espnet/espnet/commit/91ca045fc179f29bc7b7fe05cd852aea65310003](https://github.com/espnet/espnet/commit/91ca045fc179f29bc7b7fe05cd852aea65310003)
- [https://github.com/espnet/espnet/releases/tag/v.202609](https://github.com/espnet/espnet/releases/tag/v.202609)
- [https://github.com/espnet/espnet/security/advisories/GHSA-64f6-3gqc-r926](https://github.com/espnet/espnet/security/advisories/GHSA-64f6-3gqc-r926)
- [https://www.vulncheck.com/advisories/espnet-before-202609-remote-code-execution-via-unsafe-deserialization](https://www.vulncheck.com/advisories/espnet-before-202609-remote-code-execution-via-unsafe-deserialization)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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