CVE-2026-100390

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-25. A secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.4EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.4Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Zoraxy versions 3.2.3 through 3.3.4 fail to properly parse IPv6 addresses in the RemoteAddr field when setting forwarded headers. Unauthenticated attackers connecting over IPv6 can supply arbitrary X-Forwarded-For values to spoof their source IP and bypass authorization provider IP-based access controls.

CVSS v3
7.4
EG Score
7.4HIGHhigh confidence
EG Risk
33
EG Risk 33/100CISA SSVC

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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 25, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

Zoraxy 3.2.3 through 3.3.4 Client IP Spoofing via X-Forwarded-For IPv6 | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zoraxy-3.2.3-through-3.3.4-client-ip-spoofing-via-x-forwarded-for-ipv6
generic

GitHub - tobychui/zoraxy: A general purpose HTTP reverse proxy and forwarding tool. Now written in Go! · GitHub

https://github.com/tobychui/zoraxy
generic

zoraxy/src/mod/auth/sso/forward/util.go at v3.3.4 · tobychui/zoraxy · GitHub

https://github.com/tobychui/zoraxy/blob/v3.3.4/src/mod/auth/sso/forward/util.go#L127-L142
github_commit

commit 56bb3e5abb83 (tobychui/zoraxy)

Fix landed in tobychui/zoraxy commit 56bb3e5abb83 — awaiting tagged release

https://github.com/tobychui/zoraxy/commit/56bb3e5abb83eae42a64203028d73a001d6096c4
github_pr

Fix client IP detection for IPv6 clients in forward auth

Fix merged in tobychui/zoraxy PR #1264 on 2026-08-18 — awaiting tagged release

https://github.com/tobychui/zoraxy/pull/1264

Vendor Advisories for CVE-2026-100390(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 28× in last 7d / 41× 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. 2026-10-05 05:24 UTCEG score recompute
  2. 2026-10-05 05:24 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 17:27 UTCGHSA enrichment
  5. 2026-10-04 05:30 UTCGHSA enrichment
  6. 2026-10-03 17:32 UTCEG score recompute
  7. 2026-10-03 17:32 UTCGHSA enrichment
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-03 05:36 UTCGHSA enrichment
  10. 2026-10-02 17:39 UTCEG score recompute
  11. 2026-10-02 17:38 UTCGHSA enrichment
  12. 2026-10-02 05:41 UTCEG score recompute
  13. 2026-10-02 05:41 UTCGHSA enrichment
  14. 2026-10-01 19:49 UTCEPSS rescore
  15. 2026-10-01 17:42 UTCGHSA enrichment
  16. 2026-10-01 05:44 UTCGHSA enrichment
  17. 2026-09-30 17:47 UTCEG score recompute
  18. 2026-09-30 17:47 UTCGHSA enrichment
  19. 2026-09-30 15:02 UTCEPSS rescore
  20. 2026-09-30 11:46 UTCGHSA enrichment
  21. 2026-09-29 23:49 UTCEG score recompute
  22. 2026-09-29 23:49 UTCGHSA enrichment
  23. 2026-09-29 15:20 UTCEPSS rescore
  24. 2026-09-29 09:04 UTCEG score recompute
  25. 2026-09-29 09:04 UTCGHSA enrichment
Show 16 more
  1. 2026-09-28 21:03 UTCEG score recompute
  2. 2026-09-28 21:03 UTCGHSA enrichment
  3. 2026-09-28 13:50 UTCEPSS rescore
  4. 2026-09-28 09:06 UTCGHSA enrichment
  5. 2026-09-27 21:09 UTCEG score recompute
  6. 2026-09-27 21:09 UTCGHSA enrichment
  7. 2026-09-27 09:12 UTCGHSA enrichment
  8. 2026-09-26 21:15 UTCEG score recompute
  9. 2026-09-26 21:15 UTCGHSA enrichment
  10. 2026-09-26 15:58 UTCEPSS rescore
  11. 2026-09-26 09:18 UTCEG score recompute
  12. 2026-09-26 09:18 UTCGHSA enrichment
  13. 2026-09-25 21:19 UTCEG score recompute
  14. 2026-09-25 20:51 UTCEG score recompute
  15. 2026-09-25 20:24 UTCEG score recompute
  16. 2026-09-25 20:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100390?
CVE-2026-100390 is a high vulnerability published on September 25, 2026. Zoraxy versions 3.2.3 through 3.3.4 fail to properly parse IPv6 addresses in the RemoteAddr field when setting forwarded headers. Unauthenticated attackers connecting over IPv6 can supply arbitrary X-Forwarded-For values to spoof their source IP and bypass authorization provider IP-based access…
When was CVE-2026-100390 disclosed?
CVE-2026-100390 was first published on September 25, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100390 actively exploited?
CVE-2026-100390 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100390?
CVE-2026-100390 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100390?
An upstream fix for CVE-2026-100390 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-100390 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-100390

Explore →

Is Your Infrastructure Affected by CVE-2026-100390?

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

Book a Demo →Browse All CVEs