CVE catalog
CVE-2026-71513
nltk: CVE-2026-71513
- Severity
- High · CVSS 8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.10% · Oct 25, 2026
NLTK before 3.10.3 contains a remote code execution vulnerability in AllowlistUnpickler that validates only the pickle module string and not the global name, allowing attackers to resolve dotted names by attribute traversal to callables outside the allowlisted namespace. Attackers can craft untrusted transition-parser models that execute arbitrary commands when TransitionParser.parse loads the model through allowlisted_pickle_load.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | nltk | sid | 3.10.3-1 | fixed |
| Debian | nltk | forky | 3.10.3-1 | fixed |
| Debian | nltk | trixie | 3.9.1-2 | vulnerable |
| Debian | nltk | bookworm | 3.8-1 | vulnerable |
| PyPI | nltk | Not reported | 3.10.3 | fixed |
| PyPI | nltk | Not reported | 3.10.3 | fixed |
| Cpe | nltk | Not reported | 3.10.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nltk | source | sid | 3.10.3-1 | not yet assigned | Not reported | Not reported |
| Debian | nltk | source | forky | 3.10.3-1 | not yet assigned | Not reported | Not reported |
| Debian | nltk | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | nltk | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| PyPI | nltk | PyPI | Not reported | 3.10.3 | Not reported | GHSA-5GH2-94QG-QPPQ | Not reported |
| PyPI | nltk | PyPI | Not reported | 3.10.3 | Not reported | PYSEC-2026-3867 | Not reported |
| Cpe | nltk | cpe | Not reported | 3.10.3 | Not reported | NVD-CVE-2026-71513 | Not reported |
Notes
[trixie] nltk: Minor issue [bookworm] nltk: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-nltk]Affected
Source package: [nltk]
Details (2)
3.8-1· all · bookwormAffected
dsa · nltk · debian · bookworm
3.8-1· all · bookwormAffected
dsa · nltk · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11587-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-71513]
- [https://osv.dev/vulnerability/CVE-2026-71513]
- [https://security-tracker.debian.org/tracker/CVE-2026-71513]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71513.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]