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TI-2026-74403 Aliases CVE-2026-102479

Request smuggling in Eclipse Vert.x via crafted HTTP/1.x headers

Priority MEDIUM 44CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Eclipse Vert.x versions 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, and 5.2.0 are affected. The HTTP/1.x decoder's header canonicalization misreads crafted header names as well-known headers, so Content-Xength is read as Content-Length (CWE-444). A remote attacker without privileges or user interaction can send crafted HTTP requests to enable request smuggling, with high integrity impact.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

In Eclipse Vert.x versions [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x HTTP/1.x decoder uses a canonicalization for well known HTTP headers, the canonicalization process interprets well crafted headers as headers of this list, allowing for instance Content-Xength to be interpeted as Content-Length. This can be exploited for request smuggling purpose. The impacted component is io.vertx:vertx-core.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00335 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Eclipse FoundationEclipse Vert.x5.0.0 – 5.0.12; 5.1.0 – 5.1.9; 5.2.0—No fix listedCNA
  • Eclipse Vert.x VendorEclipse Foundation Affected 5.0.0 – 5.0.12; 5.1.0 – 5.1.9; 5.2.0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*5.0.0 to before 5.1.10VulnerableEclipse Foundation
cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*5.2.0VulnerableEclipse Foundation
  • cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:* Versions 5.0.0 to before 5.1.10 Vulnerable ·Eclipse Foundation
  • cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:* Versions 5.2.0 Vulnerable ·Eclipse Foundation

Remediation

The sources list no fixed version for Eclipse Vert.x.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-15 Threatist record created from CVE-2026-102479
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-16 Weakness changed · CISA ADP
  4. 2026-10-16 CISA SSVC decision points changed
  5. 2026-10-16 Priority changed: LOW → MEDIUM
  6. 2026-10-21 CVSS score added · NVD
  7. 2026-11-06 Affected versions changed · Red Hat
  8. 2026-11-06 CVSS score added · Red Hat

References

Advisory 2

  • TI-2026-06017 Improper certificate validation in Eclipse Vert.x CVSS 4.0MEDIUM 6.9
  • TI-2025-10971 In Eclipse Vert.x versions [4.0.0, 4.5.21] and [5.0.0, 5.0.4], a StaticHandler… CVSS 4.0MEDIUM 6.3
  • TI-2019-13165 Path traversal in Eclipse Vert.x CVSS 3.1CRITICAL 9.8
  • TI-2018-09003 XML external entity injection in Eclipse Vert.x CVSS 3.0CRITICAL 9.8
  • TI-2018-09001 Path traversal in Eclipse Vert.x CVSS 3.0CRITICAL 9.8
  • TI-2025-10972 Cross-site scripting in Eclipse Foundation Vert.x CVSS 4.0LOW 2.3
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences