CVE-2026-10221

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory published 2026-06-01. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: Elevated riskExposed: 0

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

A vulnerability was identified in NousResearch hermes-agent up to 0.12.0. Affected by this vulnerability is the function _compress_context of the file run_agent.py. The manipulation leads to injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
64(Attend)
EG Risk 64/100SSVC: Attend

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
Severity73% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

June 1, 2026

Last Modified

July 22, 2026

Advisory Details (1)

Auto-updated Jun 11, 2026
No patch confirmed yet.
generic

Prompt Injection via Synthetic User Message in Todo Snapshot After Context Compression · GitHub

https://gist.github.com/YLChen-007/d343fcfe2c009cd45f56dc475fd5ac03

Vendor Advisories for CVE-2026-10221(1)

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
piphermes-agent—ghsa

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.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
hermes-agent0.13.0 ... 0.19.0 (11 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 33× 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 235 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-10221?
CVE-2026-10221 is a high vulnerability published on June 1, 2026. A vulnerability was identified in NousResearch hermes-agent up to 0.12.0. Affected by this vulnerability is the function compresscontext of the file run_agent.py. The manipulation leads to injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be…
When was CVE-2026-10221 disclosed?
CVE-2026-10221 was first published in the National Vulnerability Database on June 1, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-10221 actively exploited?
CVE-2026-10221 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 76.9% of all scored CVEs.
What is the CVSS score of CVE-2026-10221?
CVE-2026-10221 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-10221?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10221, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-10221

Explore →

Is Your Infrastructure Affected by CVE-2026-10221?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs