CVE-2026-79657

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-25. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer._execute and numpy.f2py.crackfortran.myeval through pickle REDUCE to execute arbitrary commands during model or tokenizer artifact loading.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
65%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Allowlisted pickle loaders still permit code execution in current source · Advisory · nltk/nltk · GitHub

https://github.com/nltk/nltk/security/advisories/GHSA-x99w-6fgc-pmfw
generic

NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nltk-before-3.10.3-remote-code-execution-via-unsafe-pickle-deserialization

Vendor Advisories for CVE-2026-79657(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 37× in last 7d / 37× 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. 2026-08-29 07:59 UTCGHSA enrichment
  2. 2026-08-29 04:11 UTCGHSA enrichment
  3. 2026-08-29 00:17 UTCEG score recompute
  4. 2026-08-29 00:17 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 19:08 UTCGHSA enrichment
  7. 2026-08-28 17:06 UTCGHSA enrichment
  8. 2026-08-28 13:15 UTCGHSA enrichment
  9. 2026-08-28 09:25 UTCGHSA enrichment
  10. 2026-08-28 05:33 UTCGHSA enrichment
  11. 2026-08-28 01:45 UTCGHSA enrichment
  12. 2026-08-27 21:58 UTCGHSA enrichment
  13. 2026-08-27 18:11 UTCEG score recompute
  14. 2026-08-27 18:11 UTCGHSA enrichment
  15. 2026-08-27 14:25 UTCEPSS rescore
  16. 2026-08-27 14:14 UTCGHSA enrichment
  17. 2026-08-27 10:27 UTCGHSA enrichment
  18. 2026-08-27 06:40 UTCGHSA enrichment
  19. 2026-08-27 02:29 UTCGHSA enrichment
  20. 2026-08-26 22:42 UTCGHSA enrichment
  21. 2026-08-26 18:55 UTCGHSA enrichment
  22. 2026-08-26 15:08 UTCEG score recompute
  23. 2026-08-26 15:08 UTCGHSA enrichment
  24. 2026-08-26 14:47 UTCEPSS rescore
  25. 2026-08-26 11:21 UTCGHSA enrichment
Show 12 more
  1. 2026-08-26 07:33 UTCGHSA enrichment
  2. 2026-08-26 03:45 UTCGHSA enrichment
  3. 2026-08-25 23:58 UTCGHSA enrichment
  4. 2026-08-25 20:11 UTCEG score recompute
  5. 2026-08-25 20:11 UTCGHSA enrichment
  6. 2026-08-25 16:24 UTCEG score recompute
  7. 2026-08-25 16:24 UTCGHSA enrichment
  8. 2026-08-25 16:04 UTCEG score recompute
  9. 2026-08-25 16:04 UTCGHSA enrichment
  10. 2026-08-25 12:17 UTCEG score recompute
  11. 2026-08-25 11:42 UTCEG score recompute
  12. 2026-08-25 11:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-79657?
CVE-2026-79657 is a critical vulnerability published on August 25, 2026. NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer._execute and…
When was CVE-2026-79657 disclosed?
CVE-2026-79657 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79657 actively exploited?
CVE-2026-79657 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 35.4% of all scored CVEs.
What is the CVSS score of CVE-2026-79657?
CVE-2026-79657 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-79657?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79657, 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

Explore the affected products and dependency analysis for CVE-2026-79657

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