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CVE-2026-49423 is a remote denial-of-service vulnerability in FreeBSD Kernel TLS (KTLS) receive processing. The flaw occurs while handling TLS 1.2 CBC records, where a remote TLS peer can cause the kernel to read uninitialized iovec entries during HMAC computation. According to the advisory, exploitation depends on a specific record layout in which the first mbuf of a CBC record contains only the 5-byte TLS record header. This uninitialized memory access can trigger a kernel panic on systems using receive-side KTLS.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote denial-of-service vulnerability in FreeBSD KTLS affecting TLS servers with kernel TLS enabled.
A remote denial-of-service vulnerability in FreeBSD KTLS that affects systems with kernel TLS enabled.
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.