Interpretation Conflict Affecting github.com/dadrus/heimdall/internal/x/urlx package, versions <0.17.14
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published4 May 2026
- disclosed25 Apr 2026
- creditUnknown
Introduced: 25 Apr 2026
CVE-2026-42272 Â (opens in a new tab)How to fix?
Upgrade github.com/dadrus/heimdall/internal/x/urlx to version 0.17.14 or higher.
Overview
Affected versions of this package are vulnerable to Interpretation Conflict via inconsistent handling of URL-encoded slashes in the path processing. An attacker can gain unauthorized access or escalate privileges by crafting requests with lowercase percent-encoded slashes that bypass intended access control rules. This is only exploitable if the default rule is configured to allow all access and secure default rule enforcement is explicitly disabled.
Workaround
This vulnerability can be mitigated by configuring a "deny by default" rule, avoiding the use of --insecure or --insecure-skip-secure-default-rule-enforcement flags, rejecting HTTP paths containing encoded slashes at a proxy layer, or verifying the executed rule ID in downstream services.