CVE-2026-43823

HighCVSS 7.5

Published: 23/07/2026(UTC)Updated: 23/07/2026(UTC)Translated: 25/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.26%

17th percentile - higher than 17% of all known CVEs

Summary

In the swift-crypto library before version 4.5.1, when initializing an RSA public key from DER or PEM bytes fails, a double-free occurs. This can cause a crash on future memory allocations. The issue manifests when BoringSSL cannot decode the key.

Risk Assessment

A double-free can crash the application, leading to denial of service and potential system instability.

Recommendation

Update swift-crypto to version 4.5.1 or later, which includes a fix for the double-free.

Other vulnerabilities in swift-crypto

CVE-2026-28815High
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.

Original NVD description (English source)

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.