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TI-2026-46317 Aliases CVE-2026-64785GHSA-q3g2-m552-3r9c

HTTP response splitting in Apple swift-nio-http2

Priority LOW 30CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub.

Summary

SwiftNIO HTTP/2 was missing validation on inbound HEADERS frames that let CR, LF, NUL, SP and other control characters reach an HTTP/1.1 backend through NIOHTTP2's HTTP/2-to-HTTP/1 codec, enabling HTTP request smuggling or response splitting. This vulnerability is addressed in swift-nio-http2 version 1.45.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00289 21st percentileScored 2026-11-07
Fix Fixed swift-nio-http2 (Apple): 1.45.0swift-nio-http2 (SwiftURL): 1.45.0

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
Appleswift-nio-http2before 1.45.01.45.0Patch availableCNA
—swift-nio-http2 (SwiftURL)before 1.45.01.45.0Patch availableGHSA-q3g2-m552-3r9c
  • swift-nio-http2 VendorApple Affected before 1.45.0 Fixed in 1.45.0 Patch available CNA
  • swift-nio-http2 (SwiftURL) Vendor— Affected before 1.45.0 Fixed in 1.45.0 Patch available GHSA-q3g2-m552-3r9c

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apple:swiftnio_http\/2:*:*:*:*:*:swift:*:*before 1.45.0VulnerableApple
  • cpe:2.3:a:apple:swiftnio_http\/2:*:*:*:*:*:swift:*:* Versions before 1.45.0 Vulnerable ·Apple

Remediation

  • Fix · CNA swift-nio-http2 (Apple) Fixed in 1.45.0
  • Fix · GHSA-q3g2-m552-3r9c swift-nio-http2 (SwiftURL) Fixed in 1.45.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Critical. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64785
  2. 2026-10-03 Alias added: GHSA-q3g2-m552-3r9c

References

Patch 1

Advisory 1

Other 4

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2022-08484 A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a… CVSS 3.1HIGH 7.5
  • TI-2022-08486 A program using swift-nio-http2 is vulnerable to a denial of service attack caused by a… CVSS 3.1HIGH 7.5
  • TI-2022-08485 Integer overflow in Apple SwiftNIO HTTP2 CVSS 3.1HIGH 7.5
  • TI-2022-00535 A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a… CVSS 3.1HIGH 7.5
  • TI-2026-23083 Improper output encoding in Apple swift-nio-http2 CVSS 3.1MEDIUM 5.3

Sources

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