CVE-2026-39244

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-10. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

adm-zip before 0.5.18 is vulnerable to denial of service via a crafted ZIP file with a manipulated uncompressed size header field. In zipEntry.js line 103, Buffer.alloc(_centralHeader.size) allocates memory based on the declared uncompressed size from the ZIP central directory header without validating it against the actual compressed data size or imposing any upper bound. The size value is read directly from the binary header at entryHeader.js line 266 with no bounds check. An attacker can craft a ~120-byte ZIP file that declares ~4GB uncompressed size, causing a memory allocation amplification ratio of over 33 million to 1. The allocation occurs before CRC validation, so the malicious payload cannot be rejected early. All extraction and read methods are affected: readFile(), readAsText(), extractEntryTo(), extractAllTo(), extractAllToAsync(), test(), and entry.getData(). Any application accepting untrusted ZIP files via adm-zip is vulnerable to immediate process crash.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

[CVE-2026-39244] Denial of service via unbounded Buffer.alloc from crafted uncompressed-size header · Issue #568 · cthackers/adm-zip · GitHub

https://github.com/cthackers/adm-zip/issues/568
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-2026-39244(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
adm-zip—0.6.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 41× 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.

Showing the most recent 100 of 128 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39244?
CVE-2026-39244 is a high vulnerability published on July 10, 2026. adm-zip before 0.5.18 is vulnerable to denial of service via a crafted ZIP file with a manipulated uncompressed size header field. In zipEntry.js line 103, Buffer.alloc(_centralHeader.size) allocates memory based on the declared uncompressed size from the ZIP central directory header without…
When was CVE-2026-39244 disclosed?
CVE-2026-39244 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39244 actively exploited?
CVE-2026-39244 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 43.7% of all scored CVEs.
What is the CVSS score of CVE-2026-39244?
CVE-2026-39244 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-39244?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39244, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-39244

Explore →

Is Your Infrastructure Affected by CVE-2026-39244?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs