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CVE-2026-41873 is a critical HTTP Request/Response Smuggling vulnerability in the retired Lua implementation of Apache Pony Mail. The flaw stems from a CRLF injection condition in the Lua email handling logic, described as occurring in email.lua, where attacker-controlled input is incorporated into internally generated HTTP requests to the backend Elasticsearch service with insufficient sanitization. By injecting crafted line breaks into a request parameter, an unauthenticated attacker can cause inconsistent interpretation of the HTTP stream and smuggle arbitrary HTTP requests to Elasticsearch. This bypasses Pony Mail’s normal application-layer access controls and can be used to directly manipulate backend data, including creating or modifying account and session records, resulting in administrator account takeover. All versions of the Lua implementation are affected.
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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.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An HTTP Request/Response Smuggling vulnerability in the Lua implementation of Apache Pony Mail that can lead to admin account takeover. The affected product is retired and unsupported, and no fixed version is planned.
A critical CRLF injection / HTTP request smuggling vulnerability in the retired Apache Pony Mail Lua implementation that lets an unauthenticated attacker smuggle arbitrary requests to the backend Elasticsearch instance and take over accounts, including administrator accounts.
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.