CVE-2026-43823

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

7.5 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.43%Up 0.2 points since Jul 24, 2026

What each source reports

CVE List Score used 7.5

Record: CVE-2026-43823
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-415
Updated: 2026-11-02

EUVDEUVD-2026-48288 7.5

Record: EUVD-2026-48288
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

NVD 7.5

Record: CVE-2026-43823
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-415
Updated: 2026-11-02

OSV 7.5

Record: CVE-2026-43823
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2026:45784 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record: RHSA-2026:45784
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2026:45785 8.8

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Record: RHSA-2026:45785
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

apple swift-crypto

Affected packages

Affected packages
Package	Affected	Fixed
`nodejs24` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:24.18.0-0.5.hum1	0:24.18.0-0.5.hum1
`nodejs24-bin` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:24.18.0-0.5.hum1	0:24.18.0-0.5.hum1
`nodejs24-devel` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:24.18.0-0.5.hum1	0:24.18.0-0.5.hum1
`nodejs24-docs` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:24.18.0-0.5.hum1	0:24.18.0-0.5.hum1
`nodejs24-full-i18n` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:24.18.0-0.5.hum1	0:24.18.0-0.5.hum1
`nodejs24-libs` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:24.18.0-0.5.hum1	0:24.18.0-0.5.hum1
`nodejs24-npm` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:11.16.0-1.24.18.0.0.5.hum1	0:11.16.0-1.24.18.0.0.5.hum1
`nodejs24-npm-bin` Red Hat:hummingbird:1 From an advisory covering 2 CVEs	before 0:24.18.0-0.5.hum1	0:24.18.0-0.5.hum1
`swift-lang` Red Hat:hummingbird:1 From an advisory covering 5 CVEs	before 0:6.3.3-0.1.1.hum1	0:6.3.3-0.1.1.hum1
`swift-lang-runtime` Red Hat:hummingbird:1 From an advisory covering 5 CVEs	before 0:6.3.3-0.1.1.hum1	0:6.3.3-0.1.1.hum1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-43823 is a high vulnerability (CVSS 7.5) in Apple Swift-crypto, published July 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. No source names a fixed version.

References

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