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Public proof of conceptFix available

CVE-2026-1002

A public proof of concept exists; no exploitation attested.

  • Published2026-01-15
  • WeaknessCWE-444

Am I 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

The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URI. The issue comes from an improper implementation of the C. rule of section 5.2.4 of RFC3986 and is fixed in Vert.x Core component (used by Vert.x Web): https://github.com/eclipse-vertx/vert.x/pull/5895 Steps to reproduce Given a file served by the static handler, craft an URI that introduces a string like bar%2F..%2F after the last / char to deny the access to the URI with an HTTP 404 response. For example https://example.com/foo/index.html can be denied with https://example.com/foo/bar%2F..%2Findex.html Mitgation Disabling Static Handler cache fixes the issue. StaticHandler staticHandler = StaticHandler.create().setCachingEnabled(false);

Timeline

dates in UTC
  1. 2026-01-1521:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-1002?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-1002?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Eclipse vert.x-web
BranchAffectedFixed in
4.x≥ 4.0.0, ≤ 4.5.23no fix published
5.0≥ 5.0.0, ≤ 5.0.6no fix published
vertx-core
BranchAffectedFixed in
5.0≥ 5.0.0.CR1, < 5.0.75.0.7
4.5< 4.5.244.5.24

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

  • CVE-2026-1002 Red Hat Product Security29 products fixed · 19 known affected

    io.vertx/vertx-core: static handler component cache can be manipulated to deny the access to static files

    openshift-serverless-1/kn-ekb-dispatcher-rhel9 as a component of OpenShift Serverless · openshift-serverless-1/kn-ekb-receiver-rhel9 as a component of OpenShift Serverless · openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9 as a component of OpenShift Serverless · +16 more

  • RHSA-2026:34608 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Streams for Apache Kafka 2.9.4 release and security update

  • RHSA-2026:33371 Red Hat Product Security6 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.18 security update

  • RHSA-2026:25089 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: HawtIO 4.4.0 for Red Hat build of Apache Camel 4 Release and security update.

  • RHSA-2026:17789 Red Hat Product Security6 products fixed

    Red Hat Security Advisory: Red Hat build of Cryostat 4.2.0: new RHEL 9 container image security update

  • RHSA-2026:13571 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Streams for Apache Kafka 3.2.0 release and security update

8 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:34608 · 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
  2. Vendor fix Red Hat Product Security RHSA-2026:33371 · 6 productsBefore applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access…
  3. Vendor fix Red Hat Product Security RHSA-2026:17789 · 6 productsYou can download the Cryostat 4 on RHEL 9 container images that this update provides from the Red Hat Container Registry at registry.access.redhat.com. Installation instructions for your platform are available in the Red Hat Container Catalog (see the References section). Dockerfiles and scripts s…
  4. Vendor fix Red Hat Product Security RHSA-2026:10184 · 4 productsFor Red Hat OpenShift AI 2.25.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  5. Vendor fix Red Hat Product Security RHSA-2026:8159 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on. The References section of this erratum contains a download link (you must log in to download the update).
  6. Vendor fix Red Hat Product Security RHSA-2026:6192 · 4 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

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-01-15
  • OpenCVESSVC decisionpoc—
  • CNACVSS 4.06.9read 2026-10-23
  • NVDCVSS 3.15.3read 2026-10-23
  • CNAweakness (CWE)CWE-444read 2026-10-23
  • FIRST EPSSEPSS score0.4 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/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
Published
2026-01-15
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-1002?

The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URI. The issue comes from an improper implementation of the C. rule of section 5.2.4 of RFC3986 and is fixed in Vert.x Core component (used by Vert.x Web): https://github.com/eclipse-vertx/vert.x/pull/5895 Steps to reproduce Given a file served by the static handler, craft an URI that introduces a string like bar%2F..%2F after the last / char to deny the access to the URI with an HTTP 404 response. For example https://example.com/foo/index.html can be denied with https://example.com/foo/bar%2F..%2Findex.html Mitgation Disabling Static Handler cache fixes the issue. StaticHandler staticHandler = StaticHandler.create().setCachingEnabled(false);

Is CVE-2026-1002 actively exploited?

A proof-of-concept exploit exists for CVE-2026-1002, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-1002?

CVE-2026-1002 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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