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CVE-2026-28815

HIGH
7.5
CVSS Score
Published: April 3, 2026 at 01:32 AM UTC
Updated: July 24, 2026 at 09:20 PM UTC
2 products affected across 1 vendorSwift CryptomacOS

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
PoC

Description

A remote attacker can supply a short X-Wing HPKE encapsulated key and trigger an out-of-bounds read in the C decapsulation path, potentially causing a crash or memory disclosure depending on runtime protections. This issue is fixed in swift-crypto version 4.3.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Swift Crypto· Apple
95%
4.0.0 ≤ v < 4.3.1
Affected range stops below 4.3.1, so it looks safe — our inference, not a vendor statement
macOS· Apple
60%
4.0.0 ≤ v < 4.3.14.0.0
Affected range stops below 4.3.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

ExploitVendor Advisory
Source: cverecord
https://github.com/apple/swift-crypto/security/advisories/GHSA-9m44-rr2w-ppp7

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-125

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