CVE-2026-76845

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-24. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

adm-zip 0.5.9 through 0.6.0 follows symbolic links at the extraction destination. Utils.sanitize in util/utils.js enforces containment by comparing only the string form of an archive entry name against the resolved extraction root, and Utils.writeFileTo opens the computed destination with fs.openSync(path, "w", 0o666), which resolves symbolic links and carries neither O_NOFOLLOW nor a pre-write fs.lstatSync check. When a path component at the destination already exists as a symbolic link pointing outside the extraction root, extractAllTo, extractAllToAsync and extractEntryTo write the entry contents through that link and then chmod its target, placing attacker-controlled content in a file outside the root without any traversal sequence appearing in the archive. Reaching the write requires overwrite to be enabled, because the preceding fs.existsSync check also resolves the link and otherwise declines. An attacker able to create a symbolic link inside a shared, reused or predictable extraction directory, such as a temporary directory or a continuous integration workspace, can overwrite any file the extracting process is permitted to write.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 24, 2026

Advisory Details (3)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic

adm-zip 0.5.9 through 0.6.0 Arbitrary File Overwrite via Symlink Following on Extraction | Advisories | VulnCheck

https://www.vulncheck.com/advisories/adm-zip-through-arbitrary-file-overwrite-via-symlink-following-on-extraction
generic

adm-zip/util/utils.js at v0.6.0 · cthackers/adm-zip · GitHub

https://github.com/cthackers/adm-zip/blob/v0.6.0/util/utils.js
generic

GitHub - cthackers/adm-zip: A Javascript implementation of zip for nodejs. Allows user to create or extract zip files both in memory or to/from disk · GitHub

https://github.com/cthackers/adm-zip

Vendor Advisories for CVE-2026-76845(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 19× in last 7d / 19× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 09:37 UTCEG score recompute
  3. 2026-08-29 09:37 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-28 11:09 UTCEG score recompute
  6. 2026-08-28 11:08 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 12:41 UTCGHSA enrichment
  9. 2026-08-26 14:13 UTCGHSA enrichment
  10. 2026-08-25 15:46 UTCEG score recompute
  11. 2026-08-25 15:46 UTCGHSA enrichment
  12. 2026-08-25 13:49 UTCEPSS rescore
  13. 2026-08-24 17:19 UTCEG score recompute
  14. 2026-08-24 17:19 UTCGHSA enrichment
  15. 2026-08-24 16:34 UTCEG score recompute
  16. 2026-08-24 16:34 UTCGHSA enrichment
  17. 2026-08-24 14:24 UTCEG score recompute
  18. 2026-08-24 13:22 UTCEG score recompute
  19. 2026-08-24 13:22 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76845?
CVE-2026-76845 is a medium vulnerability published on August 24, 2026. adm-zip 0.5.9 through 0.6.0 follows symbolic links at the extraction destination. Utils.sanitize in util/utils.js enforces containment by comparing only the string form of an archive entry name against the resolved extraction root, and Utils.writeFileTo opens the computed destination with…
When was CVE-2026-76845 disclosed?
CVE-2026-76845 was first published in the National Vulnerability Database on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76845 actively exploited?
CVE-2026-76845 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 97.0% of all scored CVEs.
What is the CVSS score of CVE-2026-76845?
CVE-2026-76845 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-76845?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76845, 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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