CVE-2026-28898: swift-nio-http2's HTTP/2-to-HTTP/1.1 codec did not validate pseudo-header values for control characters before

Q: How do I fix CVE-2026-28898?

swiftnio http\/2: upgrade to 1.44.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-28898 being exploited?

CVE-2026-28898 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-2026-28898 affect?

CVE-2026-28898 affects swiftnio http\/2. Severity is medium (CVSS 5.3). swift-nio-http2's HTTP/2-to-HTTP/1.1 codec did not validate pseudo-header values for control characters before placing them into the translated HTTP/1.1 message. swift-nio-http2 1.44.1 adds validation of all pseudo-header values (:path, :au

Q: How urgent is CVE-2026-28898?

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

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-28898 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.

swift-nio-http2's HTTP/2-to-HTTP/1.1 codec did not validate pseudo-header values for control characters before placing them into the translated HTTP/1.1 message. swift-nio-http2 1.44.1 adds validation of all pseudo-header values (:path, :authority, :scheme, :method, and :status) at both the HPACK header validation layer and the HTTP/2-to-HTTP/1.1 translation layer. Requests or responses containing CR, LF, or NUL bytes in any pseudo-header value a

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 76%)
CISA exploited list	No
Weakness	CWE-116
Published	2026-06-25
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 19:16 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

apple swiftnio http\/2 UPGRADE

Affected: < 1.44.1

Fixed in: 1.44.1

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 1.44.1 (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-2026-28898?

swiftnio http\/2: upgrade to 1.44.1. Exact commands for each OS are on this page.

Is CVE-2026-28898 being exploited?

CVE-2026-28898 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-2026-28898 affect?

CVE-2026-28898 affects swiftnio http\/2. Severity is medium (CVSS 5.3). swift-nio-http2's HTTP/2-to-HTTP/1.1 codec did not validate pseudo-header values for control characters before placing them into the translated HTTP/1.1 message. swift-nio-http2 1.44.1 adds validation of all pseudo-header values (:path, :au

How urgent is CVE-2026-28898?

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

Software pages

Swift vulnerabilities

Related CVEs

CVE-2026-64785 MEDIUM 5.3 UPGRADE SwiftNIO HTTP/2 was missing validation on inbound HEADERS frames that let CR, LF, NUL, SP and other control ch

References

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