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CVE-2026-42934 is an out-of-bounds read vulnerability in NGINX Open Source and NGINX Plus within ngx_http_charset_module. The flaw is described as an off-by-one error in handling incomplete UTF-8 sequences across proxy buffer boundaries, which corrupts internal length state and can compute a negative source offset, resulting in a heap buffer over-read in the NGINX worker process. The issue is reachable when charset, source_charset, and charset_map are configured together with proxy_pass while proxy buffering is disabled. A remote unauthenticated attacker can trigger the vulnerable code path by sending crafted requests under the required runtime conditions, causing limited memory disclosure or a worker process restart.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Another memory corruption vulnerability identified during the same NGINX research process, but not the primary focus of the reference.
An NGINX ngx_http_charset_module heap over-read vulnerability mentioned only as background in a disclosure table.
A medium-severity out-of-bounds read vulnerability in NGINX ngx_http_charset_module caused by an off-by-one error when handling incomplete UTF-8 sequences across proxy buffer boundaries.
An out-of-bounds read in NGINX ngx_http_charset_module that can expose memory contents or cause worker restart under a specific combination of charset and proxy buffering settings.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.