CVE-2026-87794

HIGHPre-NVD 8.48.4—
EchelonGraph scoreHIGH confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. a secondary CVSS source baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

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

bestzip versions 2.2.6 and 3.0.2 contain an argument injection vulnerability in the nativeZip function that allows attackers to inject arbitrary arguments to the Info-ZIP backend. Attackers can supply a malicious destination path combined with crafted source entries to execute arbitrary commands with Node.js process privileges. Fixed in 2.2.7 and 3.0.3.

CVSS v3
8.4
EG Score
8.4(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 18, 2026

Advisory Details (6)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
generic

bestzip 2.2.6 and 3.0.2 Argument Injection via the Native Zip Destination | Advisories | VulnCheck

https://www.vulncheck.com/advisories/bestzip-2.2.6-and-3.0.2-argument-injection-via-the-native-zip-destination
github Patch Available🟡 PoC Available

Argument Injection via Native Zip Destination in bestzip · Advisory · nfriedly/node-bestzip · GitHub

https://github.com/nfriedly/node-bestzip/security/advisories/GHSA-xhwx-rch4-ph2v
github Patch Available🟡 PoC Available

Argument Injection in bestzip via native zip CLI execution · Advisory · nfriedly/node-bestzip · GitHub

https://github.com/nfriedly/node-bestzip/security/advisories/GHSA-p87m-9567-rgcc
github_commit

commit 2adb637b0acb (nfriedly/node-bestzip)

Fix landed in nfriedly/node-bestzip commit 2adb637b0acb — awaiting tagged release

https://github.com/nfriedly/node-bestzip/commit/2adb637b0acb05b8475de7db5af4b86ffcf40aaf
generic

node-bestzip/lib/bestzip.js at v3.0.2 · nfriedly/node-bestzip · GitHub

https://github.com/nfriedly/node-bestzip/blob/v3.0.2/lib/bestzip.js
generic

GitHub - nfriedly/node-bestzip: Provides a `bestzip` command that uses the system `zip` if avaliable, and a Node.js implimentation otherwise. · GitHub

https://github.com/nfriedly/node-bestzip

Vendor Advisories for CVE-2026-87794(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 31× in last 7d / 44× 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. 2026-09-19 18:13 UTCEG score recompute
  2. 2026-09-19 18:13 UTCGHSA enrichment
  3. 2026-09-19 06:22 UTCEG score recompute
  4. 2026-09-19 06:22 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 18:33 UTCEG score recompute
  7. 2026-09-18 18:33 UTCGHSA enrichment
  8. 2026-09-18 17:30 UTCEG score recompute
  9. 2026-09-18 17:30 UTCGHSA enrichment
  10. 2026-09-18 08:04 UTCGHSA enrichment
  11. 2026-09-17 20:15 UTCEG score recompute
  12. 2026-09-17 20:15 UTCGHSA enrichment
  13. 2026-09-17 19:32 UTCEPSS rescore
  14. 2026-09-17 06:02 UTCGHSA enrichment
  15. 2026-09-16 18:12 UTCEG score recompute
  16. 2026-09-16 18:12 UTCGHSA enrichment
  17. 2026-09-16 14:09 UTCEPSS rescore
  18. 2026-09-16 06:09 UTCEG score recompute
  19. 2026-09-16 06:09 UTCGHSA enrichment
  20. 2026-09-16 05:15 UTCEPSS rescore
  21. 2026-09-15 18:20 UTCGHSA enrichment
  22. 2026-09-15 06:30 UTCEG score recompute
  23. 2026-09-15 06:30 UTCGHSA enrichment
  24. 2026-09-15 03:12 UTCEPSS rescore
  25. 2026-09-14 18:41 UTCGHSA enrichment
Show 19 more
  1. 2026-09-14 06:52 UTCGHSA enrichment
  2. 2026-09-13 19:02 UTCEG score recompute
  3. 2026-09-13 19:02 UTCGHSA enrichment
  4. 2026-09-13 07:12 UTCGHSA enrichment
  5. 2026-09-12 19:23 UTCEG score recompute
  6. 2026-09-12 19:23 UTCGHSA enrichment
  7. 2026-09-12 07:33 UTCGHSA enrichment
  8. 2026-09-11 19:43 UTCEG score recompute
  9. 2026-09-11 19:43 UTCGHSA enrichment
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 07:53 UTCGHSA enrichment
  13. 2026-09-10 20:03 UTCGHSA enrichment
  14. 2026-09-10 10:52 UTCGHSA enrichment
  15. 2026-09-09 23:01 UTCEG score recompute
  16. 2026-09-09 23:01 UTCGHSA enrichment
  17. 2026-09-09 10:24 UTCEG score recompute
  18. 2026-09-09 10:15 UTCEG score recompute
  19. 2026-09-09 10:15 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87794?
CVE-2026-87794 is a high vulnerability published on September 9, 2026. bestzip versions 2.2.6 and 3.0.2 contain an argument injection vulnerability in the nativeZip function that allows attackers to inject arbitrary arguments to the Info-ZIP backend. Attackers can supply a malicious destination path combined with crafted source entries to execute arbitrary commands…
When was CVE-2026-87794 disclosed?
CVE-2026-87794 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87794 actively exploited?
CVE-2026-87794 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 91.3% of all scored CVEs.
What is the CVSS score of CVE-2026-87794?
CVE-2026-87794 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-87794?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87794, 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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