Security readout for executives and security teams
Plain-English summary
CVE-2026-3260 is a denial-of-service flaw in Undertow-related Red Hat products. A remote unauthenticated requester may cause excessive disk/resource use when an application parses parameters from a GET request carrying multipart/form-data. The main business risk is service disruption, not data theft or code execution.
Executive priority
Treat as a medium-priority availability issue. Prioritize systems where downtime affects customers, authentication, integration platforms, or revenue workflows. Because no active exploitation is cited and attack complexity is high, this should not displace critical actively exploited vulnerabilities, but it should enter normal patch and exposure-review cycles.
Technical view
Undertow may prematurely parse multipart/form-data content in HTTP GET requests when application code uses parameter-processing methods such as getParameterMap(). Parsed content can be stored to disk, enabling resource exhaustion. CVSS 3.1 is 5.9, with network access, no privileges, no user interaction, high attack complexity, and availability impact only.
Likely exposure
Exposure is most relevant for internet- or network-facing Java services using affected Red Hat products/packages, including undertow-core, RESTEasy-related packages, JBoss EAP, Fuse, Data Grid, SSO, Camel, and RHEL-listed components. Exact affected versions are not provided in the supplied data.
Exploitation context
The supplied sources do not indicate active exploitation, and the CVE is not listed as KEV. Exploitation requires an application behavior condition: processing request parameters on a GET request with multipart/form-data. CVSS marks attack complexity high, limiting broad opportunistic risk but not eliminating targeted DoS concern.
Researcher notes
Key unknowns are exact fixed versions, product errata, and whether specific deployments expose vulnerable parsing paths. The affected list is Red Hat-centric and includes multiple products with package-level references. Avoid assuming all Undertow deployments are affected unless vendor/product evidence supports it.
Mitigation direction
- Check Red Hat CVE and product advisories for fixed packages or supported mitigations.
- Prioritize externally reachable services using affected Red Hat Undertow or RESTEasy components.
- Review applications for parameter parsing on GET requests with multipart/form-data content.
- Apply vendor-provided updates when Red Hat publishes applicable fixes.
- Monitor disk usage and request patterns on exposed Java application servers.
Validation and detection
- Inventory affected Red Hat products and packages listed for CVE-2026-3260.
- Confirm whether deployed applications use Undertow or RESTEasy from affected product streams.
- Review application code paths that parse parameters for GET requests.
- Check Red Hat advisory status for exact fixed versions and errata.
- Validate monitoring alerts for abnormal temporary-file or disk growth.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-770: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-3260 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/CVE-2026-3260CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2443010CVE reference · issue-tracking, x_refsource_REDHAT
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Allocation of Resources Without Limits or Throttling
Allocation of Resources Without Limits or Throttling represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.