CVE-2026-12259
4 advisories.
PyPI/nltk CVE-2026-12259, CVE-2026-63310: medium 5.3
NLTK: Missing Post-Download Integrity Verification Allows Malicious Package Injection
Action: Upgrade nltk to 3.9.3 or later.
pip install nltk==3.9.3Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 3.9.3 | - |
Fixed versions
| 3.9.3 |
Sources
- osv: GHSA-5wp5-5229-5g6q
- https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q
- https://nvd.nist.gov/vuln/detail/CVE-2026-12259
- https://github.com/nltk/nltk/pull/3449
- https://github.com/nltk/nltk/commit/0e26734a61094b628d93e26dc18dd7302567ac46
- https://github.com/nltk/nltk
- https://github.com/nltk/nltk/releases/tag/3.9.3
- https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3729.yaml
- https://huntr.com/bounties/659ccf6d-12d4-4d4a-84c0-078633c35a5d
- https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification
CVE-2026-12259, CVE-2026-63310 · published · modified · JSON
PyPI/nltk CVE-2026-12259, CVE-2026-63310: high 7.1
Duplicate Advisory: NLTK: Missing Post-Download Integrity Verification Allows Malicious Package Injection
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | 3.9.2 |
Fixed versions
No fixed version in the source.
Sources
- osv: GHSA-gf32-cmjh-8m9v
- https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q
- https://nvd.nist.gov/vuln/detail/CVE-2026-63310
- https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification
CVE-2026-12259, CVE-2026-63310 · published · modified · JSON
PyPI/nltk CVE-2026-12259, CVE-2026-63310: medium 6.5
NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject m
Action: Upgrade nltk to 3.9.3 or later.
pip install nltk==3.9.3Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 3.9.3 | - |
Fixed versions
| 3.9.3 |
Sources
- osv: PYSEC-2026-3729
- https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification
- https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q
- https://github.com/advisories/GHSA-5wp5-5229-5g6q
CVE-2026-12259, CVE-2026-63310 · published · modified · JSON
PyPI/nltk CVE-2026-12259, CVE-2026-63310: medium 6.5
In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. T
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | 3.9.4 |
Fixed versions
No fixed version in the source.
Sources
CVE-2026-12259, CVE-2026-63310 · published · modified · JSON