Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders (CVE-2026-54499) | HOL Guard CVE

High · CVSS 7.5CVE-2026-54499GHSA-V5JW-96JM-7H2C

Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders

Answer in brief

CVE-2026-54499 records a High severity (CVSS 7.5) vulnerability in Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders. The current sources do not mark it as known exploited. The current feed maps stanfordnlp/stanza (generic), stanza (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 8, 2026Updated Jul 13, 2026Source checked Sep 17, 2026First seen by HOL Jun 19, 2026Material review Jul 13, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps stanfordnlp/stanza (generic), stanza (pip). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
stanfordnlp/stanzageneric	< 1.12.2	Not reported
stanzapip	<=1.12.1	1.12.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for stanfordnlp/stanza, stanza.
Review the reported fix. Update stanza to 1.12.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 19, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.