CVE-2026-64785: SwiftNIO HTTP/2 was missing validation on inbound HEADERS frames that let CR, LF, NUL, SP and other control ch

Q: How do I fix CVE-2026-64785?

swiftnio http\/2: upgrade to 1.45.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-64785 being exploited?

CVE-2026-64785 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-64785 affect?

CVE-2026-64785 affects swiftnio http\/2. Severity is medium (CVSS 5.3). 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 splittin

Q: How urgent is CVE-2026-64785?

Priority 29/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-64785 is a medium-severity flaw (CVSS 5.3) affecting swiftnio http\/2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-07-23
Last modified	2026-10-24

Publisher (CNA): Apple Inc. · Vendor: apple

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-23 20:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

apple swiftnio http\/2 UPGRADE

Affected: < 1.45.0

Fixed in: 1.45.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy swiftnio-http2 || rpm -q swiftnio-http2 || swiftnio-http2 --version

2. UPGRADE to 1.45.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade swiftnio-http2

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade swiftnio-http2

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-64785?

swiftnio http\/2: upgrade to 1.45.0. Exact commands for each OS are on this page.

Is CVE-2026-64785 being exploited?

CVE-2026-64785 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-64785 affect?

CVE-2026-64785 affects swiftnio http\/2. Severity is medium (CVSS 5.3). 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 splittin

How urgent is CVE-2026-64785?

Priority 29/100. Remotely exploitable, no login, no user action

References

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