CVE-2026-49419

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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

When the JAIL_AT_DESC flag is specified, kern_jail_set() and kern_jail_get() released the reference to the caller's current prison before looking up the jail descriptor. If the descriptor lookup failed, error-handling paths released the same reference a second time.

An unprivileged local user can trigger a prison reference count underflow, which may cause the prison structure to be freed while still in use. When this is done on the jail host, the bug will generally result in an immediate panic. However, if the user is running in a jail, then it may be possible to exploit the bug to elevate privileges.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

September 1, 2026

Advisory Details (1)

Auto-updated Aug 20, 2026
No patch confirmed yet.
generic
https://security.freebsd.org/advisories/FreeBSD-SA-26:38.jail.asc

Vendor Advisories for CVE-2026-49419(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 98× 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 169 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-49419?
CVE-2026-49419 is a high vulnerability published on August 19, 2026. When the JAILATDESC flag is specified, kernjailset() and kernjailget() released the reference to the caller's current prison before looking up the jail descriptor. If the descriptor lookup failed, error-handling paths released the same reference a second time. An unprivileged local user can trigger…
When was CVE-2026-49419 disclosed?
CVE-2026-49419 was first published on August 19, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49419 actively exploited?
CVE-2026-49419 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-49419?
CVE-2026-49419 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-49419?
No fix for CVE-2026-49419 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 vendor advisories EchelonGraph has for CVE-2026-49419 are linked in the Vendor Advisories panel on this page.

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