CVE-2026-31249

Code execution via unsafe PyTorch deserialization

Published May 11, 2026 · Updated May 11, 2026

Insecure deserialization in CosyVoice through commit 6e01309 allows attackers to execute code through crafted PyTorch .pt files. The make_parquet_list.py tool passes utterance embeddings, speaker embeddings, speech tokens, and optional rejection tokens from its source directory to torch.load() without weights_only=True, permitting pickle to instantiate arbitrary Python objects. Execution occurs when an operator runs the tool against a directory containing attacker-supplied .pt files and inherits that operator's privileges.

CVSS severity7.3
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure deserialization in CosyVoice through commit 6e01309 allows attackers to execute code through crafted PyTorch .pt files. The make_parquet_list.py tool passes utterance embeddings, speaker embeddings, speech tokens, and optional rejection tokens from its source directory to torch.load() without weights_only=True, permitting pickle to instantiate arbitrary Python objects. Execution occurs when an operator runs the tool against a directory containing attacker-supplied .pt files and inherits that operator's privileges.

The record

CVE
CVE-2026-31249
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, CAPEC-586, T1204.002
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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