CVE-2026-15809

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-15. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in CRI-O. The fix for a previous vulnerability (CVE-2022-4318) was incorrect, allowing it to be bypassed. An attacker capable of setting environment variables on a container can inject a newline character into the HOME environment variable. This issue allows the addition of arbitrary lines into /etc/passwd by use of a specially crafted environment variable.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

July 15, 2026

Last Modified

August 25, 2026

Advisory Details (5)

Auto-updated Jul 15, 2026
Patch available. Sources: github_pr, redhat.
github_pr

[release-1.25] server: fail if HOME variable has a newline

Fix merged in cri-o/cri-o PR #6524 on 2023-02-22 — awaiting tagged release

https://github.com/cri-o/cri-o/pull/6524
github_pr Patch Available

server: fail if HOME variable has a newline

Patch available: cri-o/cri-o v1.32.10 (PR #6450 merged 2022-12-20)

https://github.com/cri-o/cri-o/pull/6450
redhat

2500846 – (CVE-2026-15809) CVE-2026-15809 github.com/cri-o/cri-o: Fix Bypass for CVE-2022-4318 — /etc/passwd Injection via HOME env

https://bugzilla.redhat.com/show_bug.cgi?id=2500846
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/cve-2022-4318
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-15809

Vendor Advisories for CVE-2026-15809(2)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatcri-o-0:1.35.6-5.rhaos4.22.git41f610b.el92026-08-25redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 117× 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 151 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-15809?
CVE-2026-15809 is a high vulnerability published on July 15, 2026. A flaw was found in CRI-O. The fix for a previous vulnerability (CVE-2022-4318) was incorrect, allowing it to be bypassed. An attacker capable of setting environment variables on a container can inject a newline character into the HOME environment variable. This issue allows the addition of…
When was CVE-2026-15809 disclosed?
CVE-2026-15809 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15809 actively exploited?
CVE-2026-15809 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 94.2% of all scored CVEs.
What is the CVSS score of CVE-2026-15809?
CVE-2026-15809 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-15809?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15809, 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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