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CVE-2026-71290 is an improper TLS hostname verification flaw in Apache HttpComponents Client affecting the async version of HttpClient in versions 5.4-alpha through 5.6.3. When the async client is configured with HostnameVerificationPolicy.BUILTIN, that setting has no effect, resulting in hostname verification not being properly enforced on the async transport. This allows a certificate that is otherwise valid but issued for a different domain to be accepted in scenarios where the client is expected to verify the server hostname. The classic version of HttpClient is not affected.
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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.
9 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.