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.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Get an email when Red Hat Linux publishes the next one.
See Red Hat Linux's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
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 4 days ago·verify at source
- nodejs24-main-11.16.0-1.24.18.0.0.5.hum1
- swift-lang-main-6.3.3-0.1.1.hum1
- RHSA-2026:45784
- RHSA-2026:45785
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
Mitigation
Upgrade to a fixed release: nodejs24-main-11.16.0-1.24.18.0.0.5.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 interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 4 days ago·verify at source
More Red Hat Linux advisories
- CVE-2026-119977Oct 31, 2026Arbitrary code execution via predictable upgrade staging paths
- CVE-2026-111497Oct 22, 2026Out-of-Bounds Write in Google Brotli Decoder
- CVE-2026-109619Oct 21, 2026fatal error handling retains stale request state leading to use-after-free
- CVE-2026-109618Oct 21, 2026OOM bailout during request parsing leads to memory corruption and RCE
- CVE-2026-97229Oct 13, 2026integer overflow issue in CI/CD regular expression compiler
- CVE-2026-64849Aug 17, 2026Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed
iPhone and Android apps · New on the App Store
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.