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VulnerabilityPublished

CVE-2026-42273: dadrus heimdall · Interpretation Conflict

Affects dadrus heimdallSource CVE Database V5

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Not known to be exploited · CVSS 7.8 High : upgrade to 0.17.14 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 22% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.17.14
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade heimdall and dadrus/heimdall to 0.17.14.

Affected software

ProductAffectedFixed in
dadrusheimdallAffected
  • <0.17.14
Fixed in
  • 0.17.14
GitHubdadrus/heimdallpkg:github/dadrus/heimdallOther threatsAffected
  • <0.17.14
Fixed in
  • 0.17.14

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade heimdall to version 0.17.14 or later, where the host matching logic has been corrected to be case-insensitive in accordance with HTTP standards. Patch status is confirmed by the vendor's versioning information. No additional mitigations are specified.

Description

CVE-2026-42273 is a high-severity vulnerability in dadrus heimdall, a cloud native Identity Aware Proxy and Access Control Decision service. The issue arises because heimdall versions prior to 0.17.14 perform host matching in a case-sensitive manner, whereas HTTP hostnames are case-insensitive by standard. This mismatch can cause heimdall to fail to match rules correctly when the request host differs only in letter casing, potentially leading to unintended request classification. The vulnerability has been addressed in version 0.17.14.

References

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