CVE-2026-6321
No exploitation reported by the sources we read.
- Published2026-05-04
- Fixed in3.1.1
- WeaknessCWE-22
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path. Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed, with a path that appears confined under an allowed prefix normalizing to a different location. Versions <= 3.1.0 are affected. Update to 3.1.1 or later.
Timeline
dates in UTC- 2026-05-0420:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6321?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6321?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.1 | < 3.1.1 | 3.1.1 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.17.28 security, enhancement & bug fix update
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.20.17 security, enhancement & bug fix update
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.27 security, enhancement & bug fix update
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.19.22 security, enhancement & bug fix update
Red Hat Security Advisory: Cluster Observability Operator 1.5.0
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.24 security, enhancement & bug fix update
6 more advisories
Fix
- Update Openjsf fast-uri to 3.1.1
- Vendor fix Red Hat Product Security RHSA-2026:83622 · 68 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.17/html/updating_openshift_data_foundation/updating-ocs-…
- Vendor fix Red Hat Product Security RHSA-2026:57013 · 88 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.20/html/updating_openshift_data_foundation/updating-ocs-…
- Vendor fix Red Hat Product Security RHSA-2026:56431 · 68 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.18/html/updating_openshift_data_foundation/updating-ocs-…
- Vendor fix Red Hat Product Security RHSA-2026:56366 · 78 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.19/html/updating_openshift_data_foundation/updating-ocs-…
- Vendor fix Red Hat Product Security RHSA-2026:34342 · 40 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:25089 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Advisories and patches
- cna.openjsf.orgVendor Advisory
- github.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Published
- 2026-05-04
- Last Modified
- 2026-09-10
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-6321?
Is CVE-2026-6321 actively exploited?
What is the CVSS score for CVE-2026-6321?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.