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CVE-2026-78689 is a heap-based out-of-bounds write in the NGINX JavaScript (njs) XML module namespace-prefix-list parser, reachable through xml.exclusiveC14n(). A crafted XML namespace prefix list writes past a heap allocation. Both the njs and QuickJS (qjs) engines are affected. Under the default njs engine, heap corruption can affect adjacent objects and crash an NGINX worker. Under qjs, affected calls also leak the supplied prefix list, causing worker memory consumption to increase across requests. The nginxinc/nginx-saml reference implementation processes the InclusiveNamespaces PrefixList value from untrusted SAML messages before signature verification, making crafted unsigned SAML protocol messages an exposed attack path.
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A memory-leak vulnerability in the njs xml.exclusiveC14n function, fixed in njs 1.0.1.
A vulnerability affecting the xml.exclusiveC14n function in njs, fixed in njs 1.0.1. The content does not provide technical impact details.
An unauthenticated remote heap out-of-bounds write in the NGINX JavaScript XML module namespace-prefix-list parser, reachable through xml.exclusiveC14n(). It can cause repeatable NGINX worker crashes with njs or memory growth with QuickJS; potential code execution has not been demonstrated. The nginxinc/nginx-saml reference implementation is affected because it processes an untrusted SAML InclusiveNamespaces PrefixList before signature verification.
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