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CVE-2026-41920 is an improper access control vulnerability in Apache Traffic Server caused by incorrect comparison of the TLS Server Name Indication (SNI) value against the HTTP Host header. Apache Traffic Server compares the SNI and Host values using a length derived only from the Host header, which causes the comparison to succeed when the SNI merely has the Host value as a prefix. As a result, host-SNI policy enforcement can be bypassed. The issue affects Apache Traffic Server 9.0.0 through 9.1.14 and 10.0.0 through 10.1.3.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An improper access control vulnerability in Apache Traffic Server affecting versions 9.0.0 through 9.1.14 and 10.0.0 through 10.1.3.
A host-SNI policy bypass vulnerability in Apache Traffic Server caused by flawed length handling in SNI and Host comparison.
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.