High [CVE-2026-113869] Use-after-free via S/MIME decryption password prompt
This high-severity Red Hat Linux advisory covers CVE-2026-113869; related products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
Use-after-free via S/MIME decryption password prompt. Red Hat rates this important (CVSS 8.8).
Weakness: CWE-825.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: thunderbird.
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 13 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
Mitigation checklist
- --- CME Mitigation Guidance (2026-10-20) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to prevent premature deallocation of the S/MIME message decoder when message loading completes or is canceled while an interactive password prompt is open: upgrade to Thunderbird 158.0.1 (or the fixed Thunderbird builds), which prevents freeing the message decoder while it remains in use during active S/MIME security device password prompts, closing S/MIME encrypted message delivery triggering an interactive password prompt. Until patched, this is a concern on Thunderbird installations opening S/MIME encrypted messages across all supported platforms, so exercise caution when opening untrusted S/MIME messages and avoid canceling message load operations while smartcard PIN or Primary Password prompt dialogs are displayed. As a compensating measure, maintain Address Space Layout Randomization to randomize Thunderbird process memory and impede gadget predictability, deploy Endpoint Detection and Response agents to detect behavioral anomalies and post-exploitation activity, and enforce Non-Executable Memory (NX/XD bit) protections to block code execution from corrupted heap and data pages. These controls limit blast radius and contain exploitation, but they do not fix the underlying use-after-free defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-101 ASLR (Address Space Layout Randomization) (medium)
Official advisory · high-confidence parse· fetched 13 hours ago·verify at source
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