CVE-2026-11623

MEDIUMPre-NVD 4.54.5—
EchelonGraph scoreHIGH confidence

Score 4.5 from GitHub Security Advisory (severity: LOW) published 2026-06-09. the CNA's CVSS baseline 4.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vuldb, epss, ghsa
Trending — 4 sources updated this week
4.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.5Exploit: NoneExposed: 0

A fix is available — apply it.

A security vulnerability has been detected in tmux up to 3.6a. Affected is the function image_free of the file image.c. Such manipulation leads to use after free. Local access is required to approach this attack. This attack is characterized by high complexity. The exploitability is told to be difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 3.7-rc is able to address this issue. The name of the patch is fc6d94a9f8a593bd8b7031650802084385d4ee03. The affected component should be upgraded.

CVSS v3
4.5
EG Score
4.5(high)
EPSS
2.5%
KEV
Not listed

Published

June 9, 2026

Last Modified

June 23, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
Patch available. Sources: github_release, github_commit.
github_release Patch Available

tmux 3.7-rc

Patch available: tmux/tmux 3.7-rc (pre-release)

https://github.com/tmux/tmux/releases/tag/3.7-rc
github_commit Patch Available

commit fc6d94a9f8a5 (tmux/tmux)

Patch available: tmux/tmux 3.7-rc (contains commit fc6d94a9f8a5)

https://github.com/tmux/tmux/commit/fc6d94a9f8a593bd8b7031650802084385d4ee03
generic

GitHub - tmux/tmux: tmux source code · GitHub

https://github.com/tmux/tmux/
generic

UAF Write Vulnerability During Sixel Image LRU Eviction · GitHub

https://gist.github.com/XlabAITeam/f0d9952595f795129a3258ba73bbc3cb

Vendor Advisories for CVE-2026-11623(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
ubuntutmux (3.6a-2ubuntu0.1) @ resolute2026-07-05ubuntu

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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 19× 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.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-05 16:02 UTCEG score recompute
  3. 2026-07-05 16:02 UTCVendor advisory
  4. 2026-07-05 16:02 UTCGHSA enrichment
  5. 2026-07-04 14:33 UTCEG score recompute
  6. 2026-07-04 14:33 UTCVendor advisory
  7. 2026-07-04 14:33 UTCGHSA enrichment
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-03 09:20 UTCEG score recompute
  10. 2026-07-03 09:20 UTCVendor advisory
  11. 2026-07-03 09:20 UTCGHSA enrichment
  12. 2026-07-02 07:49 UTCEG score recompute
  13. 2026-07-02 07:49 UTCVendor advisory
  14. 2026-07-02 07:49 UTCGHSA enrichment
  15. 2026-07-01 15:06 UTCEPSS rescore
  16. 2026-07-01 15:06 UTCEPSS rescore
  17. 2026-07-01 06:23 UTCEG score recompute
  18. 2026-07-01 06:23 UTCVendor advisory
  19. 2026-07-01 06:23 UTCGHSA enrichment
  20. 2026-06-30 04:20 UTCEG score recompute
  21. 2026-06-30 04:20 UTCVendor advisory
  22. 2026-06-30 04:20 UTCGHSA enrichment
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 02:54 UTCEG score recompute
  25. 2026-06-29 02:54 UTCVendor advisory
Show 73 more
  1. 2026-06-29 02:54 UTCGHSA enrichment
  2. 2026-06-28 14:07 UTCEPSS rescore
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-28 01:28 UTCEG score recompute
  6. 2026-06-28 01:28 UTCVendor advisory
  7. 2026-06-28 01:28 UTCGHSA enrichment
  8. 2026-06-27 03:08 UTCEPSS rescore
  9. 2026-06-27 00:01 UTCEG score recompute
  10. 2026-06-27 00:01 UTCVendor advisory
  11. 2026-06-27 00:01 UTCGHSA enrichment
  12. 2026-06-25 22:35 UTCEG score recompute
  13. 2026-06-25 22:35 UTCVendor advisory
  14. 2026-06-25 22:35 UTCGHSA enrichment
  15. 2026-06-25 13:49 UTCEPSS rescore
  16. 2026-06-24 21:09 UTCEG score recompute
  17. 2026-06-24 21:09 UTCVendor advisory
  18. 2026-06-24 21:09 UTCGHSA enrichment
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-23 21:32 UTCEPSS rescore
  21. 2026-06-23 15:35 UTCEG score recompute
  22. 2026-06-23 15:35 UTCGHSA enrichment
  23. 2026-06-23 05:10 UTCMITRE cvelistV5CVSS v4 → 2
  24. 2026-06-22 14:25 UTCEPSS rescore
  25. 2026-06-22 14:25 UTCEPSS rescore
  26. 2026-06-22 05:28 UTCEG score recompute
  27. 2026-06-22 05:28 UTCGHSA enrichment
  28. 2026-06-21 14:56 UTCEPSS rescore
  29. 2026-06-21 14:56 UTCEPSS rescore
  30. 2026-06-21 01:59 UTCEPSS rescore
  31. 2026-06-21 01:59 UTCEPSS rescore
  32. 2026-06-21 01:56 UTCEG score recompute
  33. 2026-06-21 01:56 UTCVendor advisory
  34. 2026-06-21 01:56 UTCGHSA enrichment
  35. 2026-06-19 23:08 UTCEG score recompute
  36. 2026-06-19 23:08 UTCGHSA enrichment
  37. 2026-06-19 19:25 UTCEPSS rescore
  38. 2026-06-18 19:26 UTCEG score recompute
  39. 2026-06-18 19:26 UTCVendor advisory
  40. 2026-06-18 19:26 UTCGHSA enrichment
  41. 2026-06-18 17:52 UTCEPSS rescore
  42. 2026-06-17 17:53 UTCEPSS rescore
  43. 2026-06-17 17:10 UTCEG score recompute
  44. 2026-06-17 17:10 UTCVendor advisory
  45. 2026-06-17 17:10 UTCGHSA enrichment
  46. 2026-06-16 17:52 UTCEPSS rescore
  47. 2026-06-16 14:52 UTCEG score recompute
  48. 2026-06-16 14:52 UTCGHSA enrichment
  49. 2026-06-15 17:48 UTCEPSS rescore
  50. 2026-06-15 13:23 UTCEG score recompute
  51. 2026-06-15 13:23 UTCGHSA enrichment
  52. 2026-06-14 23:18 UTCEPSS rescore
  53. 2026-06-14 11:57 UTCEG score recompute
  54. 2026-06-14 11:57 UTCGHSA enrichment
  55. 2026-06-13 23:00 UTCEPSS rescore
  56. 2026-06-13 23:00 UTCEPSS rescore
  57. 2026-06-13 10:30 UTCEG score recompute
  58. 2026-06-13 10:30 UTCGHSA enrichment
  59. 2026-06-12 23:12 UTCEPSS rescore
  60. 2026-06-12 09:04 UTCEG score recompute
  61. 2026-06-12 09:04 UTCGHSA enrichment
  62. 2026-06-11 14:00 UTCEPSS rescore
  63. 2026-06-11 07:37 UTCEG score recompute
  64. 2026-06-11 07:37 UTCGHSA enrichment
  65. 2026-06-10 22:18 UTCEPSS rescore
  66. 2026-06-10 13:22 UTCEPSS rescore
  67. 2026-06-10 06:11 UTCEG score recompute
  68. 2026-06-10 06:11 UTCGHSA enrichment
  69. 2026-06-09 15:17 UTCNVD updateCVSS v4 → 1.1
  70. 2026-06-09 14:12 UTCMITRE cvelistV5CVSS v4 → 2
  71. 2026-06-09 06:02 UTCNVD updateCVSS v4 → 1.1
  72. 2026-06-09 04:46 UTCEG score recompute
  73. 2026-06-09 04:45 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-11623?
CVE-2026-11623 is a medium vulnerability published on June 9, 2026. A security vulnerability has been detected in tmux up to 3.6a. Affected is the function image_free of the file image.c. Such manipulation leads to use after free. Local access is required to approach this attack. This attack is characterized by high complexity. The exploitability is told to be…
When was CVE-2026-11623 disclosed?
CVE-2026-11623 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11623 actively exploited?
CVE-2026-11623 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-11623?
CVE-2026-11623 has a CVSS v4.0 base score of 4.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-11623?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11623, 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

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