CVE-2026-62423

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

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

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them:

* The directory loop itself assumes a good record length. This is CVE-2026-42494.

* The calculation of the System Use area may underflow. This is CVE-2026-42495.

* The Rock Ridge extension loop assumes a good (inner) record length. This is CVE-2026-62423.

* The Rock Ridge NM record processing assumes a good entry length. This is CVE-2026-62424.

* The Rock Ridge CE record processing assumes a good size and offset. This is CVE-2026-62425.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 28, 2026

Advisory Details (1)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

XSA-497 - Xen Security Advisories

https://xenbits.xenproject.org/xsa/advisory-497.html

Vendor Advisories for CVE-2026-62423(1)

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

Affected Packages

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
xen—4.19.6-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
xen—4.20.4-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
xen—4.20.4-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
xen—4.21.2-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
xen4.14.2+25-gb6a8c4f72d-2 ... 4.20.3+127-gc42374a105-1 (46 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
xen4.17.1+2-gb773c48e36-1 ... 4.20.3+127-gc42374a105-1 (25 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
xen4.20.0+68-g35cb38b222-1 ... 4.20.2+7-g1badcf5035-2 (6 versions)4.20.3+127-gc42374a105-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
xen4.20.0+68-g35cb38b222-1, 4.20.2+37-g61ff35323e-1, 4.20.2+7-g1badcf5035-1, 4.20.2+7-g1badcf5035-24.20.3+127-gc42374a105-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 66× 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 135 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-62423?
CVE-2026-62423 is a medium vulnerability published on July 28, 2026. [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them:…
When was CVE-2026-62423 disclosed?
CVE-2026-62423 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62423 actively exploited?
CVE-2026-62423 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 90.2% of all scored CVEs.
What is the CVSS score of CVE-2026-62423?
CVE-2026-62423 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-62423?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62423, 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-2026-62423

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