High severity · published Jul 23, 2026
CVE-2026-43823
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
7.5
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SW
swift-crypto · Apple
before 4.5.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43823
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43823
Vendor Advisory
https://github.com/apple/swift-crypto/security/advisories/GHSA-8q93-f6xh-4f6f
More from swift-crypto
7.5
CVE-2026-28815
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…
–
CVE-2026-86983
A remote attacker may be able to terminate a process that passes attacker-controlled input to the P-384 VOPRF API without bounding its length