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High 7.5Published May 5, 2026

CVE-2026-6322fast-uri vulnerable to host confusion via percent-encoded authority delimiters

Updated under an hour ago ()

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It affects fast-uri and 31 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.

CVSS
7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE)
CWE-436, CWE-140
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
openjs
NVD analysis
Modified
Record last updated
Sep 10, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
fast-uri fast-uri
fast_uri:fast_uri (from the name)
before 3.1.2; 3.1.2 not affected
CNA record
from 0:2.5.20260715-1.el8ap not affected
CISA ADP
Red Hat Red Hat Data Grid 8.6.2
redhat:jboss_data_grid
8
CISA ADP
from 0:1.1.1-1.el10_2 not affected
CISA ADP
Red Hat Cluster Observability Operator 1.5.0
redhat:cluster_observability_operator
from 1782840519 not affected
CISA ADP
from 1780910888 not affected
CISA ADP
from 1780600823 not affected
CISA ADP
from 1783448184 not affected
CISA ADP
from 1782166952 not affected; from 1788206196 not affected
CISA ADP
from 1783502765 not affected
CISA ADP
from 13.1.3-0.3.hum1 not affected
CISA ADP
from 1783690532 not affected
CISA ADP
Red Hat Red Hat Migration Toolkit for Applications 8.2
redhat:migration_toolkit_applications
from 1784109883 not affected
CISA ADP
from 1787347991 not affected
CISA ADP
from 1787031447 not affected
CISA ADP
Red Hat Red Hat Openshift Data Foundation 4.18
redhat:openshift_data_foundation
from 1786705347 not affected
CISA ADP
from 1782487717 not affected
CISA ADP
from 1781032495 not affected
CISA ADP
Red Hat Confidential Compute Attestation
redhat:confidential_compute_attestation
1
CISA ADP
Red Hat Cryostat 4
redhat:cryostat
4
CISA ADP
Red Hat Network Observability Operator
redhat:network_observ_optr
1
CISA ADP
Red Hat OpenShift Lightspeed
redhat:openshift_lightspeed
All versions
CISA ADP
Red Hat OpenShift Pipelines
redhat:openshift_pipelines
1
CISA ADP
1
CISA ADP
7
CISA ADP
4
CISA ADP
1
CISA ADP
3
CISA ADP
Red Hat Red Hat OpenShift Dev Spaces
redhat:openshift_devspaces
3
CISA ADP
Red Hat Red Hat OpenShift Virtualization 4
redhat:container_native_virtualization
4
CISA ADP
2
CISA ADP
openjsf fast-uri
openjsf:fast-uri
before 3.1.2
NVD

References

  • vendor-advisory
  • vendor-advisory

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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