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CVE-2026-34338 is an elevation-of-privilege vulnerability in the Windows Telephony Service caused by a use-after-free condition. The flaw arises from improper object lifetime handling in the Telephony Service, where memory that has already been freed can still be referenced later. An attacker with local access and low privileges may be able to reclaim the freed memory with controlled data, leading to corruption of in-process structures or redirection of execution flow within the Telephony Service process. Because the service runs with elevated privileges, successful exploitation can result in escalation from a low-privileged local context to SYSTEM. Microsoft rated the issue Important and assigned it a CVSS v3.1 base score of 7.8.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local elevation of privilege vulnerability in Windows Telephony Service caused by a use-after-free condition, allowing an authorized attacker with low privileges to gain SYSTEM privileges.
A local privilege escalation vulnerability caused by a use-after-free flaw in the Windows Telephony Service that can allow a low-privileged local user to gain SYSTEM privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.