Is CVE-2026-42274 actively exploited?

No active exploitation of CVE-2026-42274 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42274 be exploited remotely?

Yes. CVE-2026-42274 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42274?

CVE-2026-42274 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-42274

HIGH

CVE-2026-42274

CWE-35Published: May 8, 2026· Updated: May 8, 2026

7.8

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:14.3th

Official Description

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). This issue has been patched in version 0.17.14.

NVD Source

Technical Analysis

CVE-2026-42274 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