How severe is CVE-2026-64785?

CVE-2026-64785 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-64785 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-64785?

CVE-2026-64785 affects Apple Swiftnio Http/2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-64785?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-64785 published?

CVE-2026-64785 was published on 2026-07-23 and last updated on 2026-09-01.

CVE-2026-64785

CVE-2026-64785 is a medium-severity vulnerability in Apple Swiftnio Http/2 with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-444.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-444
Affected product: Apple Swiftnio Http/2
Published: 2026-07-23
Last modified: 2026-09-01

Description

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 HTTP request smuggling or response splitting. This vulnerability is addressed in swift-nio-http2 version 1.45.0.

Frequently asked questions

What is CVE-2026-64785?: 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 HTTP request smuggling or response splitting. This vulnerability is addressed in swift-nio-http2 version 1.45.0.
How severe is CVE-2026-64785?: CVE-2026-64785 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-64785 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-64785?: CVE-2026-64785 affects Apple Swiftnio Http/2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-64785?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-64785 published?: CVE-2026-64785 was published on 2026-07-23 and last updated on 2026-09-01.

References

https://github.com/apple/swift-nio-http2/security/advisories/GHSA-q3g2-m552-3r9c

Affected products (1)

cpe:2.3:a:apple:swiftnio_http\/2:*:*:*:*:*:swift:*:*

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