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Vulnerability record · CVE-2026-43823 · published 23 July 2026

CVE-2026-43823: Apple swift-crypto double free vulnerability

Apple · Swift Crypto

When initializing an RSA public key from DER or PEM bytes throws an error, the EVP_PKEY* is double-freed: first in the catch block, then in the deinit. This can lead to a crash on future memory allocations. This double-free manifests when BoringSSL cannot decode the public key from the bytes provided. This vulnerability is addressed in swift-crypto version 4.5.1.

7.5 CVSS 3.1 High EPSS 0.43% · top 65.4% CWE-415 · Double free
7.5CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
4 Sep 2026Last modified by NVD

Description

When initializing an RSA public key from DER or PEM bytes throws an error, the EVP_PKEY* is double-freed: first in the catch block, then in the deinit. This can lead to a crash on future memory allocations. This double-free manifests when BoringSSL cannot decode the public key from the bytes provided. This vulnerability is addressed in swift-crypto version 4.5.1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/apple/swift-crypto/security/advisories/GHSA-8q93-f6xh-4f6f Vendor Advisory
https://github.com/apple/swift-crypto/security/advisories/GHSA-8q93-f6xh-4f6f Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-43823), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.