CVE-2026-47766

MEDIUMPre-NVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (8th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs /dev directory without O_NOFOLLOW. If an OCI bundle contains rootfs/dev as a symlink and the bundle configuration does not mount /dev, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named ptmx in the target directory was also replaced by crun's forced ptmx -> pts/ptmx symlink. Version 1.28 fixes the issue.

CVSS v3
5.1
EG Score
5.1MEDIUMmedium confidence
EG Risk
23
EG Risk 23/100CISA 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
Severity51% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 14, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Aug 14, 2026
Patch available. Sources: github, github_release.
github_release Patch Available

1.28

Patch available: containers/crun 1.28

https://github.com/containers/crun/releases/tag/1.28
githubMentions a patch (unverified)

crun follows rootfs /dev symlink while creating default devices · Advisory · containers/crun · GitHub

https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
crun1.10-1 ... 1.9-1 (31 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
crun1.21-1 ... 1.28-1 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
crun1.21-1 ... 1.27.1-1 (7 versions)
  • every version up to 1.28-1: fixed in 1.28-1
—

Weakness Classification(1)

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

Data Freshness Timeline

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

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Frequently asked(5)

What is CVE-2026-47766?
CVE-2026-47766 is a medium vulnerability published on August 14, 2026. crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs /dev directory without O_NOFOLLOW. If an OCI bundle contains rootfs/dev as a symlink and the bundle configuration does not mount /dev, crun follows that…
When was CVE-2026-47766 disclosed?
CVE-2026-47766 was first published on August 14, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47766 actively exploited?
CVE-2026-47766 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47766?
CVE-2026-47766 has a CVSS base score of 5.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-47766?
A fix for CVE-2026-47766 is available: update to the fixed version the vendor names in its advisory.

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