CVE-2026-18774

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-08-04. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: Elevated riskExposed: 0

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

A flaw has been found in NousResearch hermes-agent up to 0.16.0. This affects the function save_url_image of the file agent/image_gen_provider.py of the component xAI Image Generation Provider. This manipulation causes server-side request forgery. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity63% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 12, 2026

Advisory Details (1)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

hermes-agent: xAI image generation provider performs an unguarded host-side fetch of provider-controlled image URLs · GitHub

https://gist.github.com/YLChen-007/7c71603a25d84f372f2275dd570e99d4

Vendor Advisories for CVE-2026-18774(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 18× in last 7d / 51× 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.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 09:30 UTCEG score recompute
  3. 2026-08-20 09:30 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 07:44 UTCEG score recompute
  6. 2026-08-19 07:44 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-18 05:58 UTCEG score recompute
  9. 2026-08-18 05:58 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 04:12 UTCEG score recompute
  12. 2026-08-17 04:12 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:26 UTCEG score recompute
  15. 2026-08-16 02:26 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-15 00:40 UTCGHSA enrichment
  19. 2026-08-13 22:54 UTCEG score recompute
  20. 2026-08-13 22:54 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-12 21:08 UTCEG score recompute
  23. 2026-08-12 21:08 UTCGHSA enrichment
  24. 2026-08-12 13:50 UTCEPSS rescore
  25. 2026-08-12 01:02 UTCEG score recompute
Show 26 more
  1. 2026-08-12 01:02 UTCGHSA enrichment
  2. 2026-08-11 13:42 UTCEPSS rescore
  3. 2026-08-11 00:00 UTCEPSS rescore
  4. 2026-08-10 23:16 UTCGHSA enrichment
  5. 2026-08-09 21:30 UTCEG score recompute
  6. 2026-08-09 21:30 UTCGHSA enrichment
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-08 19:45 UTCEG score recompute
  9. 2026-08-08 19:45 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-07 17:59 UTCEG score recompute
  12. 2026-08-07 17:59 UTCGHSA enrichment
  13. 2026-08-06 16:13 UTCEG score recompute
  14. 2026-08-06 16:13 UTCGHSA enrichment
  15. 2026-08-06 13:46 UTCEPSS rescore
  16. 2026-08-05 19:17 UTCEPSS rescore
  17. 2026-08-05 14:27 UTCEG score recompute
  18. 2026-08-05 14:27 UTCGHSA enrichment
  19. 2026-08-05 14:25 UTCNVD updateCVSS v4 → 2.1
  20. 2026-08-05 13:48 UTCEG score recompute
  21. 2026-08-05 13:48 UTCGHSA enrichment
  22. 2026-08-05 13:45 UTCMITRE cvelistV5CVSS v4 → 5.3
  23. 2026-08-04 17:23 UTCEG score recompute
  24. 2026-08-04 17:23 UTCNVD updateCVSS v4 → 2.1
  25. 2026-08-04 16:27 UTCEG score recompute
  26. 2026-08-04 16:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18774?
CVE-2026-18774 is a medium vulnerability published on August 4, 2026. A flaw has been found in NousResearch hermes-agent up to 0.16.0. This affects the function saveurlimage of the file agent/imagegenprovider.py of the component xAI Image Generation Provider. This manipulation causes server-side request forgery. The attack may be initiated remotely. The exploit has…
When was CVE-2026-18774 disclosed?
CVE-2026-18774 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18774 actively exploited?
CVE-2026-18774 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 89.6% of all scored CVEs.
What is the CVSS score of CVE-2026-18774?
CVE-2026-18774 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-18774?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18774, 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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