Medium [CVE-2026-43823] Denial of Service due to double-free during RSA public key initialization
This medium-severity Red Hat Linux advisory covers CVE-2026-43823 affecting Red Hat Hardened Images.
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Summary
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.
When an RSA (Rivest-Shamir-Adleman) public key is initialized from DER (Distinguished Encoding Rules) or PEM (Privacy-Enhanced Mail) formatted bytes, and an error occurs during the decoding process, a double-free vulnerability can be triggered. Red Hat severity: Moderate — CVSS 6.2 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-763. Affected Red Hat products: Red Hat Hardened Images.
Red Hat fixing advisory: RHSA-2026:45784, RHSA-2026:45785.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
- nodejs24-main-24.18.0-0.5.hum1
- swift-lang-main-6.3.3-0.1.1.hum1
- RHSA-2026:45784
- RHSA-2026:45785
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation
Upgrade to a fixed release: nodejs24-main-24.18.0-0.5.hum1, swift-lang-main-6.3.3-0.1.1.hum1, RHSA-2026:45784, RHSA-2026:45785. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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