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
59%
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 6× in last 7d / 39× 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 238 total refreshes for this CVE.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 04:35 UTCEG score recompute
  3. 2026-09-14 04:35 UTCGHSA enrichment
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-10 09:35 UTCEPSS rescore
  7. 2026-09-08 22:01 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-01 13:54 UTCEPSS rescore
  13. 2026-09-01 04:40 UTCEPSS rescore
  14. 2026-08-31 00:54 UTCEG score recompute
  15. 2026-08-31 00:54 UTCGHSA enrichment
  16. 2026-08-30 19:17 UTCEPSS rescore
  17. 2026-08-30 01:22 UTCEPSS rescore
  18. 2026-08-28 21:41 UTCEPSS rescore
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-26 14:46 UTCEPSS rescore
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-25 00:50 UTCEG score recompute
  23. 2026-08-25 00:50 UTCGHSA enrichment
  24. 2026-08-23 23:36 UTCGHSA enrichment
  25. 2026-08-23 11:13 UTCEG score recompute
Show 75 more
  1. 2026-08-23 11:13 UTCGHSA enrichment
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-21 22:46 UTCGHSA enrichment
  5. 2026-08-21 10:12 UTCEG score recompute
  6. 2026-08-21 10:12 UTCGHSA enrichment
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 21:30 UTCGHSA enrichment
  9. 2026-08-20 09:07 UTCEG score recompute
  10. 2026-08-20 09:07 UTCGHSA enrichment
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 13:06 UTCGHSA enrichment
  15. 2026-08-17 00:44 UTCEG score recompute
  16. 2026-08-17 00:44 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 04:57 UTCEG score recompute
  19. 2026-08-16 04:57 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 16:34 UTCGHSA enrichment
  22. 2026-08-15 04:09 UTCEG score recompute
  23. 2026-08-15 04:09 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 15:45 UTCGHSA enrichment
  26. 2026-08-14 03:23 UTCEG score recompute
  27. 2026-08-14 03:23 UTCGHSA enrichment
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-13 15:00 UTCGHSA enrichment
  30. 2026-08-13 01:59 UTCEG score recompute
  31. 2026-08-13 01:59 UTCGHSA enrichment
  32. 2026-08-12 13:51 UTCEPSS rescore
  33. 2026-08-12 13:36 UTCGHSA enrichment
  34. 2026-08-12 01:13 UTCEG score recompute
  35. 2026-08-12 01:13 UTCGHSA enrichment
  36. 2026-08-11 12:50 UTCEG score recompute
  37. 2026-08-11 12:50 UTCGHSA enrichment
  38. 2026-08-11 00:00 UTCEPSS rescore
  39. 2026-08-10 23:59 UTCGHSA enrichment
  40. 2026-08-10 11:36 UTCGHSA enrichment
  41. 2026-08-09 23:12 UTCEG score recompute
  42. 2026-08-09 23:12 UTCGHSA enrichment
  43. 2026-08-09 13:46 UTCEPSS rescore
  44. 2026-08-09 10:50 UTCGHSA enrichment
  45. 2026-08-08 22:27 UTCEG score recompute
  46. 2026-08-08 22:27 UTCGHSA enrichment
  47. 2026-08-08 16:37 UTCEPSS rescore
  48. 2026-08-08 10:04 UTCGHSA enrichment
  49. 2026-08-07 21:42 UTCEG score recompute
  50. 2026-08-07 21:42 UTCGHSA enrichment
  51. 2026-08-07 09:19 UTCGHSA enrichment
  52. 2026-08-06 20:56 UTCEG score recompute
  53. 2026-08-06 20:56 UTCGHSA enrichment
  54. 2026-08-06 13:47 UTCEPSS rescore
  55. 2026-08-06 08:33 UTCGHSA enrichment
  56. 2026-08-05 20:10 UTCEG score recompute
  57. 2026-08-05 20:10 UTCGHSA enrichment
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-04 16:10 UTCEG score recompute
  60. 2026-08-04 16:10 UTCGHSA enrichment
  61. 2026-08-04 15:10 UTCEPSS rescore
  62. 2026-08-04 10:39 UTCEPSS rescore
  63. 2026-08-04 03:24 UTCGHSA enrichment
  64. 2026-08-03 15:00 UTCEG score recompute
  65. 2026-08-03 15:00 UTCGHSA enrichment
  66. 2026-08-03 10:36 UTCEPSS rescore
  67. 2026-08-02 23:32 UTCGHSA enrichment
  68. 2026-08-02 11:08 UTCEG score recompute
  69. 2026-08-02 11:08 UTCGHSA enrichment
  70. 2026-08-02 02:27 UTCEPSS rescore
  71. 2026-08-01 22:45 UTCGHSA enrichment
  72. 2026-08-01 10:22 UTCEG score recompute
  73. 2026-08-01 10:21 UTCGHSA enrichment
  74. 2026-08-01 04:16 UTCEPSS rescore
  75. 2026-07-31 14:28 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 40.8% 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.

Dependency Blast Radius

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