CVE-2026-43823
Swift-Crypto RSA Double Free Vulnerability
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.
INFO
Published Date :
July 23, 2026, 3:17 p.m.
Last Modified :
July 23, 2026, 3:28 p.m.
Remotely Exploit :
No
Source :
[email protected]
Solution
- Update swift-crypto to version 4.5.1.
- Apply relevant security patches.
- Test the application for stability.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43823.
| URL | Resource |
|---|---|
| https://github.com/apple/swift-crypto/security/advisories/GHSA-8q93-f6xh-4f6f |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43823 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43823
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43823 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43823 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apple', 'product': 'swift-crypto', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '4.5.1', 'versionType': 'custom'}]}] Added 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. Added Reference https://github.com/apple/swift-crypto/security/advisories/GHSA-8q93-f6xh-4f6f