CVE-2026-76845

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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

The CVE record's CNA (VulnCheck) lists cthackers adm-zip versions 0.5.9 up to and including 0.6.0 as affected. No release containing a fix is confirmed on record.

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
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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 (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 24, 2026

Last Modified

October 12, 2026

Advisory Details (3)

Auto-updated Aug 24, 2026
No fix on record yet.
Web page

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
Web page

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
Web page

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.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npmadm-zip—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
adm-zip—
  • 0.5.9 through 0.6.0: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 81× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 141 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 41 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-10-12 15:29 UTCEG score recompute
  4. 2026-10-12 15:29 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  5. 2026-10-11 19:23 UTCEG score recompute
  6. 2026-10-11 16:39 UTCEG score recompute
  7. 2026-10-11 13:58 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-10-10 13:00 UTCEG score recompute
  11. 2026-10-10 13:00 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-10-09 04:58 UTCEG score recompute
  14. 2026-10-09 04:58 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  15. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-10-08 04:02 UTCEG score recompute
  17. 2026-10-08 04:02 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  19. 2026-10-07 01:20 UTCEG score recompute
  20. 2026-10-07 01:20 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  22. 2026-10-06 02:53 UTCEG score recompute
  23. 2026-10-06 02:53 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  24. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-10-05 02:21 UTCEG score recompute
Show 75 more
  1. 2026-10-05 02:21 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  2. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-10-04 03:40 UTCEG score recompute
  4. 2026-10-04 03:39 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  5. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-10-03 05:11 UTCEG score recompute
  7. 2026-10-03 05:11 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  8. 2026-10-02 06:43 UTCEG score recompute
  9. 2026-10-02 06:43 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-10-01 05:42 UTCEG score recompute
  12. 2026-10-01 05:42 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  13. 2026-09-30 07:15 UTCEG score recompute
  14. 2026-09-30 07:15 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  15. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-09-28 21:35 UTCEG score recompute
  17. 2026-09-28 21:35 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  18. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  19. 2026-09-27 23:08 UTCEG score recompute
  20. 2026-09-27 23:08 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  22. 2026-09-27 00:41 UTCEG score recompute
  23. 2026-09-27 00:41 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  26. 2026-09-24 21:20 UTCEG score recompute
  27. 2026-09-24 21:20 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  28. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  29. 2026-09-24 03:02 UTCEG score recompute
  30. 2026-09-24 03:02 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  31. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  32. 2026-09-23 04:35 UTCEG score recompute
  33. 2026-09-23 04:35 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  34. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  35. 2026-09-22 06:08 UTCEG score recompute
  36. 2026-09-22 06:08 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  37. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  38. 2026-09-21 07:40 UTCEG score recompute
  39. 2026-09-21 07:40 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  40. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-09-20 08:49 UTCEG score recompute
  42. 2026-09-20 08:49 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  43. 2026-09-19 10:08 UTCEG score recompute
  44. 2026-09-19 10:08 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  45. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  46. 2026-09-18 11:39 UTCEG score recompute
  47. 2026-09-18 11:39 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  48. 2026-09-17 13:08 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  49. 2026-09-16 14:16 UTCEG score recompute
  50. 2026-09-16 14:16 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  51. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  52. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-09-15 15:19 UTCEG score recompute
  54. 2026-09-15 15:19 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  55. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-09-14 16:51 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  57. 2026-09-13 18:24 UTCEG score recompute
  58. 2026-09-13 18:24 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  59. 2026-09-12 19:57 UTCEG score recompute
  60. 2026-09-12 19:57 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  61. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-09-11 21:30 UTCEG score recompute
  63. 2026-09-11 21:30 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  64. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  65. 2026-09-10 23:02 UTCEG score recompute
  66. 2026-09-10 23:02 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  67. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-09-10 00:34 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  69. 2026-09-09 01:32 UTCEG score recompute
  70. 2026-09-09 01:32 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  71. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  72. 2026-09-07 19:08 UTCEG score recompute
  73. 2026-09-07 19:08 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5
  74. 2026-09-06 20:41 UTCEG score recompute
  75. 2026-09-06 20:41 UTCGHSA enrichmentGHSA-vwc7-r8mq-g2x9 · GitHub CVSS 6.5

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-76845?
CVE-2026-76845 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-76845 was made public on August 18, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 24, 2026. EchelonGraph's copy of the record carries a last-modified date of October 12, 2026; the record at its source may have been updated since.
Is CVE-2026-76845 actively exploited?
CVE-2026-76845 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76845?
CVE-2026-76845 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76845?
No fix for CVE-2026-76845 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (VulnCheck) lists cthackers adm-zip versions 0.5.9 up to and including 0.6.0 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-76845 are linked in the Vendor Advisories panel on this page.

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