CVE-2026-49959

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

Hermes WebUI before version 0.51.311 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands by placing malicious executable Git configuration in a workspace repository's .git/config file. Attackers can exploit Git subprocess invocations in api/workspace_git.py through vectors such as core.fsmonitor during git status, protocol.ext.allow with ext:: remotes during git fetch, credential.helper, core.askPass, core.gitProxy, or inherited environment variables including GIT_SSH_COMMAND to achieve arbitrary command execution on the host running the application.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 2026

Advisory Details (4)

Auto-updated Jun 9, 2026
Patch available. Sources: github_commit, github_pr, github_release.
generic

Hermes WebUI < 0.51.311 RCE via Git Configuration Injection | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hermes-webui-rce-via-git-configuration-injection
github_release Patch Available

v0.51.311

Patch available: nesquena/hermes-webui v0.51.311

https://github.com/nesquena/hermes-webui/releases/tag/v0.51.311
github_pr Patch Available

Release v0.51.311 — Release KA (brick-wave: workspace Git RCE hardening #3769 + stale-snapshot sidebar visibility #3770)

Patch available: nesquena/hermes-webui v0.51.312 (PR #3776 merged 2026-06-07)

https://github.com/nesquena/hermes-webui/pull/3776
github_commit Patch Available

commit 938ac9f55b53 (nesquena/hermes-webui)

Patch available: nesquena/hermes-webui v0.51.312 (contains commit 938ac9f55b53)

https://github.com/nesquena/hermes-webui/commit/938ac9f55b53def1eefb48c4c42dabaf9c22e99c

Vendor Advisories for CVE-2026-49959(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 16× in last 7d / 64× 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 131 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-49959?
CVE-2026-49959 is a high vulnerability published on June 9, 2026. Hermes WebUI before version 0.51.311 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary commands by placing malicious executable Git configuration in a workspace repository's .git/config file. Attackers can exploit Git subprocess invocations in…
When was CVE-2026-49959 disclosed?
CVE-2026-49959 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49959 actively exploited?
CVE-2026-49959 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 42.5% of all scored CVEs.
What is the CVSS score of CVE-2026-49959?
CVE-2026-49959 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-49959?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49959, 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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