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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-54499] Remote Code Execution via unsafe deserialization in model loaders

This high-severity Red Hat Linux advisory covers CVE-2026-54499 affecting Red Hat Ceph Storage 9, Red Hat OpenShift distributed tracing 3.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-54499 Source published Source updated

VulniPulse record published Record updated

CVE-2026-54499
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

Stanza is a Stanford NLP Python library for tokenization, sentence segmentation, NER, and parsing of many human languages. Prior to 1.12.2, Stanza model loaders such as stanza.models.common.pretrain.

Pretrain.load() attempt torch.load(..., weights_only=True) but fall back to torch.load(..., weights_only=False) on attacker-controllable pickle. UnpicklingError, allowing a malicious.pt pretrain or model file to execute arbitrary pickle code when a Stanza NLP pipeline loads it.

This issue is fixed in version 1.12.2. However, if this safe load fails due to an attacker-controllable pickle.

UnpicklingError, the loaders fall back to an unsafe deserialization method. This allows a remote attacker to craft a malicious pretrain or model file that, when loaded by a Stanza NLP pipeline, can execute arbitrary code with the privileges of the affected process, leading to potential credential theft or data exfiltration.

An unsafe deserialization vulnerability in the Stanza Python library can lead to remote code execution. A malicious model pretrain file from an untrusted or compromised source can trigger an insecure deserialization fallback during model loading, resulting in arbitrary code execution with the privileges of the affected process.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-502.

Is CVE-2026-54499 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-54499 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-54499?

Upgrade to a fixed release named by Red Hat:

  • 1.12.2

Confirm against the vendor advisory before you patch.

Affected versions
  • < 1.12.2

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Fixed versions
  • 1.12.2

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this vulnerability, ensure that Stanza model pretrain files are exclusively sourced from trusted repositories and locations. Avoid loading model files from untrusted or unverified sources, as this could lead to the execution of arbitrary code. Implement strict access controls on directories where Stanza models are stored to prevent the introduction of malicious files.

Official advisory · high-confidence parse· fetched 13 days ago·verify at source

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