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Vulnerabilities

Vulnerability · CVE-2026-3260

The Undertow web server enforces a default maximum HTTP request entity size limit.

Published Mar 24, 2026 · catalog updated Jul 7, 2026 · The Undertow web server

Last checked Nov 10, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2026-3260 is not in CISA KEV. FIRST estimates a 44.00% chance of exploitation in the next 30 days. Check whether you run The Undertow web server.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The Undertow web server).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
44.00%
Remediation
Vendor / distro source
Affected products
vendor redhat

The Undertow web server enforces a default maximum HTTP request entity size limit. Any request (including GET or HEAD) containing a body that exceeds this configurable limit is safely dropped by the server, preventing single-request Resource Exhaustion (Out of Memory) Denial of Service attacks.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor redhatversion unspecified

How to fix CVE-2026-3260

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-3260 is not in CISA KEV. FIRST estimates a 44.00% chance of exploitation in the next 30 days. Check whether you run The Undertow web server.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 44.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 24, 2026 · EUVD

    Detected

    The Undertow web server enforces a default maximum HTTP request entity size limit. Any request (including GET or HEAD) containing a body that exceeds this configurable limit is safely dropped by the server, preventing single-request Resource Exhaustion (Out of Memory) Denial of Service attacks.

  2. Jul 7, 2026 · EUVD

    Updated

    The Undertow web server enforces a default maximum HTTP request entity size limit. Any request (including GET or HEAD) containing a body that exceeds this configurable limit is safely dropped by the server, preventing single-request Resource Exhaustion (Out of Memory) Denial of Service attacks.

Sources

  • CVE.orgVulnerability recordCVE-2026-3260

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2026-14732

    The Undertow web server enforces a default maximum HTTP request entity size limit. Any request (including GET or HEAD) containing a body that exceeds this configurable limit is safely dropped by the server, preventing single-request Resource Exhaustion (Out of Memory) Denial of S

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Jul 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 10, 2026
  • EUVDNov 10, 2026