# Stanza: RCE via pickle deserialization in the lemmatizer

Advisory record · `GHSA-gh9r-c94j-cmp5`

- **Identifiers:** `GHSA-gh9r-c94j-cmp5` · `CVE-2026-115878`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-94](https://cwe.mitre.org/data/definitions/94.html) · [CWE-502](https://cwe.mitre.org/data/definitions/502.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md) · [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md)
- **Published:** 3 Nov 2026
- **Updated:** 3 Nov 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Nov 2026, 20:29 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `stanza` (PyPI): affected `>=1.14.0, <1.15.0`; fixed in `1.15.0`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0060, the 48th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 3 Nov 2026, 20:26 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-115878)
- 3 Nov 2026, 20:29 UTC: [Confirmed by GitHub Advisory Database](https://github.com/advisories/GHSA-gh9r-c94j-cmp5)
- 3 Nov 2026, 20:32 UTC: First seen by agentprime
- 3 Nov 2026, 20:45 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-gh9r-c94j-cmp5)
- 3 Nov 2026, 21:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-115878)

## Sources

- [GitHub Advisory Database: GHSA-gh9r-c94j-cmp5](https://github.com/advisories/GHSA-gh9r-c94j-cmp5)
- [OSV: GHSA-gh9r-c94j-cmp5](https://osv.dev/vulnerability/GHSA-gh9r-c94j-cmp5)
- <https://github.com/stanfordnlp/stanza/security/advisories/GHSA-gh9r-c94j-cmp5>
- <https://github.com/stanfordnlp/stanza/pull/1649>
- <https://github.com/stanfordnlp/stanza/commit/b21e1c9b47b4fccff21d3b0a6c0687a19410c2f0>
- <https://github.com/stanfordnlp/stanza>
- <https://github.com/stanfordnlp/stanza/releases/tag/v1.15.0>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-gh9r-c94j-cmp5>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-gh9r-c94j-cmp5/>. Everything for agents: <https://agentprime.io/llms.txt>.