Is CVE-2026-42272 actively exploited?

No active exploitation of CVE-2026-42272 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42272 be exploited remotely?

Yes. CVE-2026-42272 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42272?

CVE-2026-42272 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-42272

HIGH

CVE-2026-42272

CWE-178Published: May 8, 2026· Updated: May 8, 2026

7.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.9th

Official Description

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall handles URL-encoded slashes (%2F) in a case-sensitive manner, while percent-encoding is defined to be case-insensitive. As a result, the lowercase equivalent (%2f) is not recognized and therefore not processed as expected when allow_encoded_slashes is set to off (the default setting). This discrepancy can lead to differences in how request paths are interpreted by heimdall and upstream components, which may result in authorization bypass. This issue has been patched in version 0.17.14.

NVD Source

Technical Analysis

CVE-2026-42272 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X