Is CVE-2026-28898 actively exploited?

No active exploitation of CVE-2026-28898 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-28898 be exploited remotely?

Yes. CVE-2026-28898 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-28898?

CVE-2026-28898 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-28898

CWE-116Published: June 25, 2026· Updated: Jun 30, 2026

5.3

CVSS v3.1

EPSS:0.19%probability of exploitation in 30 daysPercentile:9.1th

Official Description

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 are now rejected with a connection error. This issue is fixed in swift-nio-http2 1.44.1.

NVD Source

Technical Analysis

CVE-2026-28898 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.