Is CVE-2026-64785 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-64785 being exploited in the wild.

How severe is CVE-2026-64785?

Medium severity, with a CVSS score of 5.3, published 23 July 2026.

Which products and versions are affected?

swift-nio-http2 (Swift) < 1.45.0.

Is there a fix for CVE-2026-64785?

A patch was published on 1.45.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-64785 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-64785?

Check whether you run Apple SwiftNIO HTTP2 or swift-nio-http2 (Swift) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-64785: Apple SwiftNIO HTTP/2 request smuggling via header validation bypass

Q: Is there a fix for CVE-2026-64785?

A patch was published on 1.45.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-64785 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-64785?

Check whether you run Apple SwiftNIO HTTP2 or swift-nio-http2 (Swift) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-64785 · Severity: medium · CVSS 5.3 · Published 2026-07-23

Apple's SwiftNIO HTTP/2 library, used for building high-performance network applications, contains a flaw in how it handles web traffic headers. An attacker could send specially crafted requests to bypass security checks, potentially leading to 'request smuggling' where they can interfere with other users' sessions or bypass security filters. This could allow unauthorized access to data or the ability to manipulate how a web server responds to legitimate users.

Technologies: Apple SwiftNIO HTTP2. Vendors: Apple, Swift.

Quick answers

Is CVE-2026-64785 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-64785 being exploited in the wild.
How severe is CVE-2026-64785?: Medium severity, with a CVSS score of 5.3, published 23 July 2026.
Which products and versions are affected?: swift-nio-http2 (Swift) < 1.45.0.
Is there a fix for CVE-2026-64785?: A patch was published on 1.45.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-64785 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-64785?: Check whether you run Apple SwiftNIO HTTP2 or swift-nio-http2 (Swift) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

SwiftNIO HTTP/2 fails to properly validate inbound HEADERS frames for control characters like CR, LF, NUL, and SP when using the HTTP2ToHTTP1Codec. Regular header values were only checked against a forbidden-name list, allowing attackers to inject CRLF sequences to terminate fields early and inject extra headers into outbound HTTP/1.1 messages. Additionally, pseudo-headers like ':path' were not checked for spaces, allowing for request-target manipulation that causes parser differentials in downstream HTTP/1.1 backends. This vulnerability is primarily reachable in pipelines that skip outbound validation or trust pre-validated headers. The issue is fixed in version 1.45.0.

Affected products

Apple swift-nio-http2 < 1.45.0

Identifiers

CVE-2026-64785
GHSA-q3g2-m552-3r9c

Timeline

2026-07-23: disclosed
2026-07-24: advisory
1.45.0: patched

References

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