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CVE-2026-34877 affects Mbed TLS versions 2.19.0 through 3.6.5 and Mbed TLS 4.0.0. The flaw is caused by insufficient protection of serialized SSL context or session structures. If an attacker can modify these serialized structures before they are restored or processed by the library, the malformed data can trigger memory corruption. The provided context states that the issue is associated with incorrect use of privileged APIs and that successful exploitation can lead to arbitrary code execution.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in Mbed TLS caused by insufficient protection of serialized SSL context or session structures, allowing modified serialized data to trigger memory corruption and arbitrary code execution.
A vulnerability listed as fixed by updating Mbed TLS to version 3.6.6 in OpenWrt 24.10.7.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.