CVE-2026-13723

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 2026-07-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%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 (CERT/CC) lists Develar app-builder versions up to and including 4.2.0 as affected. No release containing a fix is confirmed on record.

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
6.5MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100

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.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 29, 2026

Last Modified

July 30, 2026

Advisory Details (3)

Auto-updated Jul 29, 2026
No fix on record yet. Sources: cert, github_pr.
GitHub pull request

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
Web page

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 12× in last 7d / 58× 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 185 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 85 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-12 16:34 UTCEG score recompute
  4. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-10-11 20:11 UTCEG score recompute
  6. 2026-10-11 18:23 UTCEG score recompute
  7. 2026-10-11 14:57 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  10. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  13. 2026-10-07 00:00 UTCEG score recompute
  14. 2026-10-07 00:00 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-05 20:51 UTCEG score recompute
  17. 2026-10-05 20:51 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  18. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-10-04 07:00 UTCEG score recompute
  21. 2026-10-04 07:00 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  22. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-10-02 17:57 UTCEG score recompute
  24. 2026-10-02 17:57 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  25. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 75 more
  1. 2026-10-01 03:33 UTCEG score recompute
  2. 2026-10-01 03:33 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  3. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-09-29 07:35 UTCEG score recompute
  6. 2026-09-29 07:35 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-09-27 19:36 UTCEG score recompute
  9. 2026-09-27 19:36 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  10. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-09-25 05:37 UTCEG score recompute
  13. 2026-09-25 05:37 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  14. 2026-09-23 21:48 UTCEG score recompute
  15. 2026-09-23 21:48 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  16. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-09-22 15:48 UTCEG score recompute
  18. 2026-09-22 15:48 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  19. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-20 00:22 UTCEG score recompute
  21. 2026-09-20 00:22 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  22. 2026-09-19 00:12 UTCEG score recompute
  23. 2026-09-19 00:11 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  24. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-09-18 02:06 UTCEG score recompute
  26. 2026-09-18 02:06 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  27. 2026-09-17 04:01 UTCEG score recompute
  28. 2026-09-17 04:01 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  29. 2026-09-16 05:56 UTCEG score recompute
  30. 2026-09-16 05:56 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  31. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  32. 2026-09-15 07:50 UTCEG score recompute
  33. 2026-09-15 07:50 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  34. 2026-09-13 23:33 UTCEG score recompute
  35. 2026-09-13 23:33 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  36. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  37. 2026-09-13 01:28 UTCEG score recompute
  38. 2026-09-13 01:28 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  39. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  40. 2026-09-12 03:23 UTCEG score recompute
  41. 2026-09-12 03:23 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  42. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  43. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  44. 2026-09-11 05:18 UTCEG score recompute
  45. 2026-09-11 05:18 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  46. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  47. 2026-09-10 07:12 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  48. 2026-09-09 07:47 UTCEG score recompute
  49. 2026-09-09 07:47 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  50. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  51. 2026-09-07 20:46 UTCEG score recompute
  52. 2026-09-07 20:46 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  53. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  54. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  55. 2026-09-06 08:07 UTCEG score recompute
  56. 2026-09-06 08:07 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  57. 2026-09-05 10:02 UTCEG score recompute
  58. 2026-09-05 10:01 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  59. 2026-09-04 11:55 UTCEG score recompute
  60. 2026-09-04 11:55 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  61. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  62. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  63. 2026-09-01 22:46 UTCEG score recompute
  64. 2026-09-01 22:46 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  65. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  66. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  67. 2026-08-31 23:55 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  68. 2026-08-30 21:25 UTCEG score recompute
  69. 2026-08-30 21:25 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  70. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  71. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  72. 2026-08-29 23:17 UTCEG score recompute
  73. 2026-08-29 23:17 UTCGHSA enrichmentGHSA-m52r-27c6-4q88 · GitHub CVSS 6.5
  74. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  75. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.5% · 38th percentile

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Frequently asked(5)

What is CVE-2026-13723?
CVE-2026-13723 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-13723 published?
The CVE record for CVE-2026-13723 was published on July 29, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 30, 2026; the record at its source may have been updated since.
Is CVE-2026-13723 actively exploited?
CVE-2026-13723 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-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?
No fix for CVE-2026-13723 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 (CERT/CC) lists Develar app-builder versions up to and including 4.2.0 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-13723 are linked in the Vendor Advisories panel on this page.

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