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CVE-2026-42934 is a heap buffer over-read vulnerability in the NGINX ngx_http_charset_module charset-conversion path. It affects configurations that enable charset, source_charset, and charset_map directives and proxy_pass with proxy buffering disabled. Under these conditions, unauthenticated requests can trigger a worker-process heap over-read when additional conditions outside the attacker's control are met.
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Patch, then assume compromise.
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.
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.
31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced by the TuxCare Rocky Linux 9.6 local security-check advisory; no technical flaw details are provided.
A vulnerability referenced by an AlmaLinux 9.6 local security-check plugin and associated security advisory.
A network-accessible vulnerability with high attack complexity and no required privileges or user interaction. The provided CVSS v3 vector indicates low confidentiality and availability impact, with no integrity impact.
Another memory corruption vulnerability identified during the same NGINX research process, but not the primary focus of the reference.
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.