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CVE-2026-70368 is a stack-based out-of-bounds read in stunnel's s_vlog function when processing oversized log messages through vsnprintf. When protocol input handled by a stunnel service causes generation of a log message longer than 1024 bytes, the vulnerable logging path can read past the intended bounds of stack memory. This can result in abnormal process termination and, in certain corner cases, replacement of trailing newline characters with null bytes during log handling.
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What an attacker gets, and what they’ve been doing with it.
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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.
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1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.