Apple Swiftnio http/2 vulnerabilities

7 CVEs affecting Apple Swiftnio http/2, 1 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-64785, published 2026-07-23.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2023-44487: HTTP/2 Rapid Reset Attack Vulnerability, published 2023-10-10. High severity, CVSS 7.5. Actively exploited: in CISA KEV since 2023-10-10. EPSS: 100% chance of exploitation in the next 30 days. The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
CVE-2022-24666, published 2022-02-09. High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days. A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HTTP/2 frame. This attack affects all swift-nio-http2 versions from…
CVE-2022-0618, published 2022-03-10. High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days. A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HTTP/2 frame. This vulnerability is caused by a logical error when…
CVE-2022-24668, published 2022-02-09. High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days. A program using swift-nio-http2 is vulnerable to a denial of service attack caused by a network peer sending ALTSVC or ORIGIN frames. This attack affects all swift-nio-http2 versions from 1.0.0 to…
CVE-2022-24667, published 2022-02-09. High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days. A program using swift-nio-http2 is vulnerable to a denial of service attack, caused by a network peer sending a specially crafted HPACK-encoded header block. This attack affects all swift-nio-http2…
CVE-2026-28898, published 2026-06-25. Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days. 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…
CVE-2026-64785, published 2026-07-23. Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days. 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…