CVE-2026-13723

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 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.

A vulnerability in the zipx.Unzip extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing: • a symlink entry named ss pointing to a target file, and • a regular file named ß containing attacker controlled data, will cause the second write to follow the symlink and overwrite the target file.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

July 29, 2026

Last Modified

July 30, 2026

Advisory Details (3)

Auto-updated Jul 29, 2026
No patch confirmed yet. Sources: cert, github_pr.
github_pr

fix: prevent symlink-following arbitrary file overwrite in zipx.Unzip (VU#293714)

Upstream fix in progress (PR #163 · develar/app-builder, state=open)

https://github.com/develar/app-builder/pull/163
cert

VU#293714 - Arbitrary File Overwrite in Develar app-builder (zipx.Unzip) via Symlink Following on macOS (APFS)

http://kb.cert.org/vuls/id/293714
generic

GitHub - develar/app-builder: Generic helper tool to build app in a distributable format · GitHub

https://github.com/develar/app-builder

Vendor Advisories for CVE-2026-13723(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 71× 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 141 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13723?
CVE-2026-13723 is a medium vulnerability published on July 29, 2026. A vulnerability in the zipx.Unzip extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g.,…
When was CVE-2026-13723 disclosed?
CVE-2026-13723 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13723 actively exploited?
CVE-2026-13723 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 60.5% of all scored CVEs.
What is the CVSS score of CVE-2026-13723?
CVE-2026-13723 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-13723?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13723, 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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