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
38%
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 15× in last 7d / 79× 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 01:21 UTCEPSS rescore
  2. 2026-08-29 23:17 UTCEG score recompute
  3. 2026-08-29 23:17 UTCGHSA enrichment
  4. 2026-08-28 21:40 UTCEPSS rescore
  5. 2026-08-27 14:24 UTCEPSS rescore
  6. 2026-08-27 12:12 UTCEG score recompute
  7. 2026-08-27 12:12 UTCGHSA enrichment
  8. 2026-08-26 14:05 UTCGHSA enrichment
  9. 2026-08-25 15:57 UTCEG score recompute
  10. 2026-08-25 15:57 UTCGHSA enrichment
  11. 2026-08-25 13:48 UTCEPSS rescore
  12. 2026-08-24 17:53 UTCEG score recompute
  13. 2026-08-24 17:53 UTCGHSA enrichment
  14. 2026-08-23 18:05 UTCEG score recompute
  15. 2026-08-23 18:05 UTCGHSA enrichment
  16. 2026-08-23 00:19 UTCEPSS rescore
  17. 2026-08-22 20:00 UTCEG score recompute
  18. 2026-08-22 20:00 UTCGHSA enrichment
  19. 2026-08-21 23:48 UTCEPSS rescore
  20. 2026-08-21 21:55 UTCGHSA enrichment
  21. 2026-08-20 23:47 UTCEG score recompute
  22. 2026-08-20 23:47 UTCGHSA enrichment
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-20 01:43 UTCEG score recompute
  25. 2026-08-20 01:42 UTCGHSA enrichment
Show 65 more
  1. 2026-08-19 17:03 UTCEPSS rescore
  2. 2026-08-19 03:37 UTCEG score recompute
  3. 2026-08-19 03:37 UTCGHSA enrichment
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-18 05:32 UTCEG score recompute
  6. 2026-08-18 05:32 UTCGHSA enrichment
  7. 2026-08-17 07:13 UTCEG score recompute
  8. 2026-08-17 07:13 UTCGHSA enrichment
  9. 2026-08-16 14:56 UTCEPSS rescore
  10. 2026-08-16 09:08 UTCEG score recompute
  11. 2026-08-16 09:08 UTCGHSA enrichment
  12. 2026-08-16 02:14 UTCEPSS rescore
  13. 2026-08-15 11:04 UTCEG score recompute
  14. 2026-08-15 11:04 UTCGHSA enrichment
  15. 2026-08-15 01:30 UTCEPSS rescore
  16. 2026-08-14 12:58 UTCEG score recompute
  17. 2026-08-14 12:58 UTCGHSA enrichment
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-13 14:53 UTCGHSA enrichment
  20. 2026-08-12 16:48 UTCEG score recompute
  21. 2026-08-12 16:47 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-11 18:42 UTCEG score recompute
  24. 2026-08-11 18:42 UTCGHSA enrichment
  25. 2026-08-11 13:42 UTCEPSS rescore
  26. 2026-08-10 23:59 UTCEPSS rescore
  27. 2026-08-10 20:33 UTCGHSA enrichment
  28. 2026-08-09 22:28 UTCEG score recompute
  29. 2026-08-09 22:28 UTCGHSA enrichment
  30. 2026-08-09 13:46 UTCEPSS rescore
  31. 2026-08-09 00:23 UTCEG score recompute
  32. 2026-08-09 00:23 UTCGHSA enrichment
  33. 2026-08-08 16:37 UTCEPSS rescore
  34. 2026-08-08 02:17 UTCEG score recompute
  35. 2026-08-08 02:17 UTCGHSA enrichment
  36. 2026-08-07 04:12 UTCEG score recompute
  37. 2026-08-07 04:12 UTCGHSA enrichment
  38. 2026-08-06 13:46 UTCEPSS rescore
  39. 2026-08-06 06:07 UTCEG score recompute
  40. 2026-08-06 06:07 UTCGHSA enrichment
  41. 2026-08-05 19:17 UTCEPSS rescore
  42. 2026-08-05 08:02 UTCEG score recompute
  43. 2026-08-05 08:02 UTCGHSA enrichment
  44. 2026-08-04 15:09 UTCEPSS rescore
  45. 2026-08-04 10:38 UTCEPSS rescore
  46. 2026-08-04 09:56 UTCGHSA enrichment
  47. 2026-08-03 11:35 UTCGHSA enrichment
  48. 2026-08-02 13:28 UTCEG score recompute
  49. 2026-08-02 13:28 UTCGHSA enrichment
  50. 2026-08-02 02:26 UTCEPSS rescore
  51. 2026-08-01 15:23 UTCEG score recompute
  52. 2026-08-01 15:23 UTCGHSA enrichment
  53. 2026-08-01 04:15 UTCEPSS rescore
  54. 2026-07-31 17:18 UTCGHSA enrichment
  55. 2026-07-30 19:13 UTCGHSA enrichment
  56. 2026-07-30 17:38 UTCEG score recompute
  57. 2026-07-30 17:37 UTCGHSA enrichment
  58. 2026-07-30 16:27 UTCEPSS rescore
  59. 2026-07-29 19:32 UTCGHSA enrichment
  60. 2026-07-29 18:34 UTCEG score recompute▲ 6.50
  61. 2026-07-29 18:34 UTCGHSA enrichment
  62. 2026-07-29 18:32 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  63. 2026-07-29 18:27 UTCNVD update
  64. 2026-07-29 17:37 UTCEG score recompute
  65. 2026-07-29 17:37 UTCMITRE cvelistV5first tracked

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 61.6% 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.

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