CVE-2026-86242

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-06. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: None knownExposed: 0

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

Bifrost HTTP transport before 2.0.0 accepts an enabled custom plugin whose path is an HTTP URL through unauthenticated POST /api/plugins when management authentication is disabled (the default, governance.auth_config.is_enabled=false). The shared-object loader treats an http-prefixed path as a download URL, writes the body to a temporary .so, and passes it to Go's plugin.Open. After a successful open, optional Init runs immediately with the supplied config as the Bifrost process user. On documented dynamically linked builds (DYNAMIC=1 / no static-link flags), which the vendor requires for custom Go plugins, plugin.Open is expected to succeed and this is unauthenticated remote code execution. On the published statically linked Docker image, plugin.Open fails with Dynamic loading not supported, so that build class is only server-side request forgery. Attack complexity is High because the attacker cannot force RCE on the default static image and a loadable plugin must match the host Go version, OS, architecture, and linkage. The 1.6.x HTTP transport line through 1.6.11 does not contain the fix.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

September 6, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Sep 6, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

GitHub - maximhq/bifrost: Fastest enterprise AI gateway (50x faster than LiteLLM) with adaptive load balancer, cluster mode, guardrails, 1000+ models support & <100 µs overhead at 5k RPS. · GitHub

https://github.com/maximhq/bifrost
github_commit

commit e0057ff355f8 (maximhq/bifrost)

Fix landed in maximhq/bifrost commit e0057ff355f8 — awaiting tagged release

https://github.com/maximhq/bifrost/commit/e0057ff355f831c251eabe9d0e44f3a3748532c6
github_pr

path normalization auth bypass

Fix merged in maximhq/bifrost PR #5763 on 2026-08-03 — awaiting tagged release

https://github.com/maximhq/bifrost/pull/5763

Vendor Advisories for CVE-2026-86242(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 56× 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. 2026-09-20 10:17 UTCGHSA enrichment
  2. 2026-09-19 22:37 UTCEG score recompute
  3. 2026-09-19 22:37 UTCGHSA enrichment
  4. 2026-09-19 10:57 UTCGHSA enrichment
  5. 2026-09-18 23:18 UTCEG score recompute
  6. 2026-09-18 23:18 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 11:38 UTCGHSA enrichment
  9. 2026-09-17 23:56 UTCEG score recompute
  10. 2026-09-17 23:56 UTCGHSA enrichment
  11. 2026-09-17 19:32 UTCEPSS rescore
  12. 2026-09-17 10:59 UTCGHSA enrichment
  13. 2026-09-16 23:19 UTCEG score recompute
  14. 2026-09-16 23:19 UTCGHSA enrichment
  15. 2026-09-16 14:09 UTCEPSS rescore
  16. 2026-09-16 11:39 UTCEG score recompute
  17. 2026-09-16 11:38 UTCGHSA enrichment
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 23:54 UTCGHSA enrichment
  20. 2026-09-15 12:15 UTCEG score recompute
  21. 2026-09-15 12:15 UTCGHSA enrichment
  22. 2026-09-15 03:12 UTCEPSS rescore
  23. 2026-09-15 03:12 UTCEPSS rescore
  24. 2026-09-15 00:33 UTCGHSA enrichment
  25. 2026-09-14 12:53 UTCGHSA enrichment
Show 31 more
  1. 2026-09-14 01:13 UTCEG score recompute
  2. 2026-09-14 01:13 UTCGHSA enrichment
  3. 2026-09-13 13:33 UTCGHSA enrichment
  4. 2026-09-13 01:53 UTCEG score recompute
  5. 2026-09-13 01:53 UTCGHSA enrichment
  6. 2026-09-12 14:12 UTCGHSA enrichment
  7. 2026-09-12 02:32 UTCEG score recompute
  8. 2026-09-12 02:32 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 14:53 UTCEPSS rescore
  11. 2026-09-11 14:51 UTCEG score recompute
  12. 2026-09-11 14:50 UTCGHSA enrichment
  13. 2026-09-11 03:09 UTCGHSA enrichment
  14. 2026-09-10 15:29 UTCEG score recompute
  15. 2026-09-10 15:29 UTCGHSA enrichment
  16. 2026-09-10 03:43 UTCGHSA enrichment
  17. 2026-09-09 16:03 UTCGHSA enrichment
  18. 2026-09-09 07:33 UTCEG score recompute
  19. 2026-09-09 07:33 UTCGHSA enrichment
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-08 19:54 UTCEG score recompute
  22. 2026-09-08 19:54 UTCGHSA enrichment
  23. 2026-09-08 11:08 UTCGHSA enrichment
  24. 2026-09-07 23:26 UTCEG score recompute
  25. 2026-09-07 23:26 UTCGHSA enrichment
  26. 2026-09-07 11:44 UTCGHSA enrichment
  27. 2026-09-07 00:03 UTCEG score recompute
  28. 2026-09-07 00:03 UTCGHSA enrichment
  29. 2026-09-06 12:22 UTCEG score recompute
  30. 2026-09-06 11:29 UTCEG score recompute
  31. 2026-09-06 11:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86242?
CVE-2026-86242 is a high vulnerability published on September 6, 2026. Bifrost HTTP transport before 2.0.0 accepts an enabled custom plugin whose path is an HTTP URL through unauthenticated POST /api/plugins when management authentication is disabled (the default, governance.authconfig.isenabled=false). The shared-object loader treats an http-prefixed path as a…
When was CVE-2026-86242 disclosed?
CVE-2026-86242 was first published in the National Vulnerability Database on September 6, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86242 actively exploited?
CVE-2026-86242 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 51.8% of all scored CVEs.
What is the CVSS score of CVE-2026-86242?
CVE-2026-86242 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-86242?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86242, 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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