What is CVE-2026-28898?

CVE-2026-28898 is a medium-severity vulnerability in Apple Swift-nio-http2, classified under Improper Encoding or Escaping of Output. CVSS score: 5.3/10. Published 2026-06-25.

How severe is CVE-2026-28898?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apple Swift-nio-http2

CVE-2026-28898

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, :a…

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Apple Swift-nio-http2 — versions 0

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

product-security@apple.com

Frequently asked questions

What is CVE-2026-28898?: CVE-2026-28898 is a medium-severity vulnerability in Apple Swift-nio-http2, classified under Improper Encoding or Escaping of Output. CVSS score: 5.3/10. Published 2026-06-25.
How severe is CVE-2026-28898?: Medium severity. CVSS v3 base score is 5.3 out of 10.