CVE-2026-42273

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 77% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. This issue has been patched in version 0.17.14.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

May 8, 2026

Last Modified

May 8, 2026

Advisory Details (4)

Auto-updated May 8, 2026
Patch available. Sources: github.
github Patch Available

Case-sensitive host matching may lead to policy bypass · Advisory · dadrus/heimdall · GitHub

https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37
generic

Release v0.17.14 · dadrus/heimdall · GitHub

https://github.com/dadrus/heimdall/releases/tag/v0.17.14
generic

fix: Case-insensitive host matching by dadrus · Pull Request #3208 · dadrus/heimdall · GitHub

https://github.com/dadrus/heimdall/pull/3208
generic

fix: Case-insensitive host matching (#3208) · dadrus/heimdall@3d05e56 · GitHub

https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/dadrus/heimdall—0.17.14—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 26× 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 147 total refreshes for this CVE.

  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 15:10 UTCOSV refresh
  4. 2026-09-11 14:53 UTCEPSS rescore
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  25. 2026-08-17 11:59 UTCEG score recompute
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  1. 2026-08-16 14:56 UTCEPSS rescore
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  3. 2026-08-16 02:14 UTCEPSS rescore
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  5. 2026-08-14 03:16 UTCEG score recompute
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-12 16:51 UTCEG score recompute
  8. 2026-08-12 13:51 UTCEPSS rescore
  9. 2026-08-11 15:54 UTCEG score recompute
  10. 2026-08-11 13:43 UTCEPSS rescore
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  21. 2026-08-05 19:17 UTCEPSS rescore
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  24. 2026-08-03 19:35 UTCEG score recompute
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  26. 2026-08-02 03:39 UTCEG score recompute
  27. 2026-08-01 04:16 UTCEPSS rescore
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  37. 2026-07-23 03:11 UTCEG score recompute
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  43. 2026-07-18 10:04 UTCEPSS rescore
  44. 2026-07-16 17:03 UTCEPSS rescore
  45. 2026-07-16 09:53 UTCOSV refresh
  46. 2026-07-15 16:57 UTCEPSS rescore
  47. 2026-07-15 02:00 UTCEPSS rescore
  48. 2026-07-13 22:30 UTCEPSS rescore
  49. 2026-07-13 06:13 UTCEPSS rescore
  50. 2026-07-12 05:46 UTCEPSS rescore
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  67. 2026-06-25 13:49 UTCEPSS rescore
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  73. 2026-06-21 14:56 UTCEPSS rescore
  74. 2026-06-21 14:56 UTCEPSS rescore
  75. 2026-06-21 01:59 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42273?
CVE-2026-42273 is a high vulnerability published on May 8, 2026. Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host…
When was CVE-2026-42273 disclosed?
CVE-2026-42273 was first published in the National Vulnerability Database on May 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42273 actively exploited?
CVE-2026-42273 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 77.3% of all scored CVEs.
What is the CVSS score of CVE-2026-42273?
CVE-2026-42273 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-42273?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42273, 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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