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CVE-2026-64785

MEDIUM
5.3
CVSS Score
Published: July 23, 2026 at 06:50 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
1 product affected across 1 vendorSwiftnio HTTP /2

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Swiftnio HTTP /2· Apple
95%
v < 1.45.0
Affected range stops below 1.45.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://github.com/apple/swift-nio-http2/security/advisories/GHSA-q3g2-m552-3r9c

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-444

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