CVE-2025-71408

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-25. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker who controls command-line arguments to execute arbitrary Python code. When collocations.py is invoked directly, the __main__ block passes command-line arguments directly to eval() as suffixes of BigramAssocMeasures without allowlist validation or sanitization, enabling an attacker to supply a Python expression that escapes the intended attribute lookup and executes arbitrary code including OS commands via the os module.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 24, 2026

Last Modified

July 25, 2026

Advisory Details (4)

Auto-updated Jul 24, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_commit.
generic

NLTK < 3.9.2 Eval Injection via collocations.py Command-Line Arguments | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nltk-eval-injection-via-collocations-py-command-line-arguments
github_commit Patch Available

commit 66f14096d952 (nltk/nltk)

Patch available: nltk/nltk v3.10.0-rc1 (contains commit 66f14096d952)

https://github.com/nltk/nltk/commit/66f14096d952ec8f04934f515e027534bd4eb0ac
github_pr Patch Available

replace eval() with getattr() in collocations CLI

Patch available: nltk/nltk v3.10.0-rc1 (PR #3465 merged 2025-12-03)

https://github.com/nltk/nltk/pull/3465
generic🟡 PoC Available

NLTK Command Injection via eval() in collocations.py

https://aydinnyunus.github.io/2026/06/07/command-injection-nltk-collocations-eval/

Vendor Advisories for CVE-2025-71408(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 14× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-27 15:04 UTCEG score recompute
  2. 2026-07-27 15:04 UTCGHSA enrichment
  3. 2026-07-27 14:13 UTCEPSS rescore
  4. 2026-07-27 02:55 UTCGHSA enrichment
  5. 2026-07-26 14:55 UTCEG score recompute
  6. 2026-07-26 14:55 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 02:55 UTCEG score recompute
  10. 2026-07-26 02:55 UTCGHSA enrichment
  11. 2026-07-25 14:17 UTCEPSS rescore
  12. 2026-07-25 14:17 UTCEPSS rescore
  13. 2026-07-24 21:37 UTCEG score recompute
  14. 2026-07-24 21:36 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2025-71408?
CVE-2025-71408 is a high vulnerability published on July 24, 2026. NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker who controls command-line arguments to execute arbitrary Python code. When collocations.py is invoked directly, the main block passes command-line…
When was CVE-2025-71408 disclosed?
CVE-2025-71408 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on July 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-71408 actively exploited?
CVE-2025-71408 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.6% of all scored CVEs.
What is the CVSS score of CVE-2025-71408?
CVE-2025-71408 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2025-71408?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-71408, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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