CVE-2026-115878

Stanza: RCE via pickle deserialization in the lemmatizer

CVSS score

7.8

EPSS probability

—

Risk score

0.8

Published

3 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

RCE Vulnerability Announced for Stanza

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

Stanza contains a remote code execution vulnerability in the lemmatizer component due to insecure pickle deserialization.

Why does it matter?

Attackers can leverage this vulnerability to access sensitive data or achieve full system compromise.

What should be done?

Follow vendor advisories and patch assessments.
Verify checkpoint paths from trusted sources.
Keep the Stanza library up to date.

Chain of evidence and sources2 verified claims

Stanza kütüphanesinin lemmatizer bileşeninde pickle seri durumdan çıkarma yoluyla RCE zafiyeti bulunur.

S0 · daybreach-canonical S1 · cvelist

Trainer.load fonksiyonu, ayrıştırılmamış bayt akışını kısıtlamasız pickle.loads ile işler.

S0 · daybreach-canonical S1 · cvelist

Show the technical text from the sources

Stanza is a Stanford NLP Python library for tokenization, sentence segmentation, NER, and parsing of many human languages. From 1.14.0 until 1.15.0, loading an attacker-supplied lemmatizer checkpoint can execute arbitrary code because stanza/models/lemma/trainer.py stores pos_dict as gzip-compressed pickle bytes and Trainer.load passes the decompressed stream to unrestricted pickle.loads. The outer torch.load call uses weights_only=True, but the nested bytes are treated as a primitive and are not inspected by that allowlist. The path is reachable during pipeline construction through a caller-influenced lemma_model_path, before inference begins. This issue is fixed in version 1.15.0.

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

CWE: CWE-94, CWE-502

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-115878 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	stanfordnlp	stanza	View
2	pypi	stanza	View

Total affected vendors: 2|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
7.8	CVSS V31	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	NVD
7.8	CVSS V3_1	HIGH	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	CVE CNA
7.8	CVSS 3.x	—	Vector not published	GitHub Advisory
0.0	CVSS 4.0	—	Vector not published	GitHub Advisory

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-115878 is associated with the following CWEs:

CWE-94: Improper Control of Generation of Code ('Code Injection')CWE-502: Deserialization of Untrusted Data

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-115878 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

UserGerekiyor

Official Sources and Advisories

https://github.com/stanfordnlp/stanza/security/advisories/GHSA-gh9r-c94j-cmp5vendor-advisory https://github.com/stanfordnlp/stanza/pull/1649vendor-advisory https://github.com/stanfordnlp/stanza/commit/b21e1c9b47b4fccff21d3b0a6c0687a19410c2f0vendor-advisory https://github.com/stanfordnlp/stanza/releases/tag/v1.15.0vendor-advisory https://github.com/advisories/GHSA-gh9r-c94j-cmp5vendor-advisory

CVSS Vector Radar Chart

7.8 / 10

Vulnerability Scoring Details

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

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone required

User Interaction—

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)High

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

stanfordnlp

pypi

Weakness Type (CWE & CAPEC)

CWE-94 CWE-502

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