CVE-2026-12221

HIGHPre-NVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2026-06-15. a secondary CVSS source baseline 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.0Exploit: None knownExposed: 0

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

A vulnerability was found in Yealink SIP-T46U 108.86.0.118. This impacts the function sprintf of the file /api/upgrade/upgrade of the component Firmware Chunk Upload Handler. Performing a manipulation of the argument uid/start_offset results in stack-based buffer overflow. The attack needs to be approached within the local network. The exploit has been made public and could be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.

CVSS v3
8.0
EG Score
8.0(medium)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity80% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

June 15, 2026

Last Modified

July 24, 2026

References (5)

Vendor Advisories for CVE-2026-12221(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 70× 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 115 total refreshes for this CVE.

  1. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-27 08:53 UTCGHSA enrichment
  3. 2026-07-26 20:19 UTCEG score recompute
  4. 2026-07-26 20:19 UTCGHSA enrichment
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-26 05:13 UTCEG score recompute
  8. 2026-07-26 05:13 UTCGHSA enrichment
  9. 2026-07-25 14:17 UTCEPSS rescore
  10. 2026-07-24 14:17 UTCEPSS rescore
  11. 2026-07-23 03:05 UTCEG score recompute
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:24 UTCEPSS rescore
  14. 2026-07-20 17:08 UTCEPSS rescore
  15. 2026-07-19 14:30 UTCEPSS rescore
  16. 2026-07-19 02:28 UTCEPSS rescore
  17. 2026-07-18 10:04 UTCEPSS rescore
  18. 2026-07-16 23:01 UTCGHSA enrichment
  19. 2026-07-16 17:02 UTCEPSS rescore
  20. 2026-07-16 04:24 UTCGHSA enrichment
  21. 2026-07-15 16:57 UTCEPSS rescore
  22. 2026-07-15 15:51 UTCGHSA enrichment
  23. 2026-07-15 02:00 UTCEPSS rescore
  24. 2026-07-15 01:27 UTCGHSA enrichment
  25. 2026-07-14 10:24 UTCGHSA enrichment
Show 75 more
  1. 2026-07-13 22:30 UTCEPSS rescore
  2. 2026-07-13 21:02 UTCGHSA enrichment
  3. 2026-07-13 08:28 UTCGHSA enrichment
  4. 2026-07-13 06:12 UTCEPSS rescore
  5. 2026-07-12 15:59 UTCGHSA enrichment
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-12 01:08 UTCGHSA enrichment
  8. 2026-07-11 12:34 UTCGHSA enrichment
  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-11 00:01 UTCGHSA enrichment
  11. 2026-07-10 11:23 UTCGHSA enrichment
  12. 2026-07-09 21:19 UTCGHSA enrichment
  13. 2026-07-09 19:10 UTCEPSS rescore
  14. 2026-07-09 03:28 UTCGHSA enrichment
  15. 2026-07-08 14:52 UTCGHSA enrichment
  16. 2026-07-08 01:47 UTCGHSA enrichment
  17. 2026-07-07 13:06 UTCGHSA enrichment
  18. 2026-07-07 00:30 UTCGHSA enrichment
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 02:23 UTCEPSS rescore
  21. 2026-07-05 23:52 UTCGHSA enrichment
  22. 2026-07-05 11:18 UTCGHSA enrichment
  23. 2026-07-05 02:30 UTCEPSS rescore
  24. 2026-07-05 02:30 UTCEPSS rescore
  25. 2026-07-04 22:44 UTCGHSA enrichment
  26. 2026-07-04 10:08 UTCGHSA enrichment
  27. 2026-07-04 06:31 UTCEPSS rescore
  28. 2026-07-03 20:11 UTCGHSA enrichment
  29. 2026-07-03 07:36 UTCGHSA enrichment
  30. 2026-07-02 19:03 UTCGHSA enrichment
  31. 2026-07-02 06:27 UTCGHSA enrichment
  32. 2026-07-01 17:52 UTCGHSA enrichment
  33. 2026-07-01 15:06 UTCEPSS rescore
  34. 2026-07-01 15:06 UTCEPSS rescore
  35. 2026-07-01 05:17 UTCGHSA enrichment
  36. 2026-06-30 23:22 UTCEPSS rescore
  37. 2026-06-30 16:43 UTCGHSA enrichment
  38. 2026-06-30 04:09 UTCGHSA enrichment
  39. 2026-06-29 15:31 UTCGHSA enrichment
  40. 2026-06-29 02:51 UTCGHSA enrichment
  41. 2026-06-28 14:17 UTCGHSA enrichment
  42. 2026-06-28 14:07 UTCEPSS rescore
  43. 2026-06-28 04:56 UTCEPSS rescore
  44. 2026-06-28 04:56 UTCEPSS rescore
  45. 2026-06-28 01:43 UTCGHSA enrichment
  46. 2026-06-27 13:08 UTCGHSA enrichment
  47. 2026-06-27 07:35 UTCNVD updateCVSS v4 → 7.3
  48. 2026-06-27 06:04 UTCMITRE cvelistV5CVSS v4 → 8.6
  49. 2026-06-27 03:08 UTCEPSS rescore
  50. 2026-06-27 00:34 UTCGHSA enrichment
  51. 2026-06-26 11:59 UTCGHSA enrichment
  52. 2026-06-25 21:38 UTCGHSA enrichment
  53. 2026-06-25 13:49 UTCEPSS rescore
  54. 2026-06-25 09:04 UTCGHSA enrichment
  55. 2026-06-24 20:30 UTCGHSA enrichment
  56. 2026-06-24 14:05 UTCEPSS rescore
  57. 2026-06-24 07:47 UTCGHSA enrichment
  58. 2026-06-23 21:32 UTCEPSS rescore
  59. 2026-06-23 18:58 UTCGHSA enrichment
  60. 2026-06-23 06:24 UTCGHSA enrichment
  61. 2026-06-22 17:16 UTCGHSA enrichment
  62. 2026-06-22 14:25 UTCEPSS rescore
  63. 2026-06-22 14:25 UTCEPSS rescore
  64. 2026-06-22 03:49 UTCGHSA enrichment
  65. 2026-06-21 14:56 UTCEPSS rescore
  66. 2026-06-21 14:56 UTCEPSS rescore
  67. 2026-06-21 14:07 UTCGHSA enrichment
  68. 2026-06-21 01:59 UTCEPSS rescore
  69. 2026-06-21 01:59 UTCEPSS rescore
  70. 2026-06-21 00:54 UTCGHSA enrichment
  71. 2026-06-20 11:55 UTCGHSA enrichment
  72. 2026-06-19 23:21 UTCGHSA enrichment
  73. 2026-06-19 19:25 UTCEPSS rescore
  74. 2026-06-19 10:44 UTCGHSA enrichment
  75. 2026-06-18 22:10 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12221?
CVE-2026-12221 is a high vulnerability published on June 15, 2026. A vulnerability was found in Yealink SIP-T46U 108.86.0.118. This impacts the function sprintf of the file /api/upgrade/upgrade of the component Firmware Chunk Upload Handler. Performing a manipulation of the argument uid/start_offset results in stack-based buffer overflow. The attack needs to be…
When was CVE-2026-12221 disclosed?
CVE-2026-12221 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12221 actively exploited?
CVE-2026-12221 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 70.3% of all scored CVEs.
What is the CVSS score of CVE-2026-12221?
CVE-2026-12221 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2026-12221?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12221, 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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