CVE-2026-7829

HIGHPre-NVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. a secondary CVSS source baseline 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.2Exploit: None knownExposed: 0

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

UltraVNC repeater through 1.8.2.2 contains a post-authentication out-of-bounds write in the allow/deny rule parser. In repeater/webgui/settings.c:225-272, after strncpy_s copies a rule token into temp1[rule1] (25-byte destination) or temp2/temp3 (16-byte destination), the code unconditionally writes a NUL terminator at temp1[rule1][len] = 0 without clamping len to the destination size. When an authenticated administrator saves a rule with a token length equal to or greater than the destination size, the NUL byte is written one or more bytes past the end of the stack-allocated array, corrupting adjacent stack data. An attacker who has obtained admin credentials (including via CVE-2026-7839 default password) can trigger this to gain code execution on the repeater host.

CVSS v3
7.2
EG Score
7.2(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity72% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 9, 2026

Advisory Details (2)

Auto-updated Jul 1, 2026
No patch confirmed yet.
generic

Home - UltraVNC VNC OFFICIAL SITE, Remote Desktop Free Opensource

https://uvnc.com/
generic

GitHub - ultravnc/UltraVNC: 👁️ UltraVNC Server, UltraVNC Viewer, UltraVNC Repeater and UltraVNC SC | Official repository: https://github.com/ultravnc/UltraVNC · GitHub

https://github.com/ultravnc/UltraVNC

Vendor Advisories for CVE-2026-7829(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 8× in last 7d / 74× 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 208 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-7829?
CVE-2026-7829 is a high vulnerability published on July 1, 2026. UltraVNC repeater through 1.8.2.2 contains a post-authentication out-of-bounds write in the allow/deny rule parser. In repeater/webgui/settings.c:225-272, after strncpy_s copies a rule token into temp1[rule1] (25-byte destination) or temp2/temp3 (16-byte destination), the code unconditionally…
When was CVE-2026-7829 disclosed?
CVE-2026-7829 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7829 actively exploited?
CVE-2026-7829 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.9% of all scored CVEs.
What is the CVSS score of CVE-2026-7829?
CVE-2026-7829 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-7829?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7829, 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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