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CVE-2026-40996 is a cryptographic-default vulnerability in Spring Web Services' Wss4jSecurityInterceptor. The interceptor set the inbound validation setting allowing RSA PKCS#1 v1.5 key transport to true, overriding Apache WSS4J's safer default. Consequently, inbound WS-Security decryption accepted rsa-1_5 encrypted key material unless administrators explicitly disabled the option. Affected versions are Spring Web Services 3.1.0 through 3.1.8, 4.0.0 through 4.0.18, 4.1.0 through 4.1.3, and 5.0.0 through 5.0.1.
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No public exploit code observed for this vulnerability.
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6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity Spring Web Services cryptographic configuration flaw in Wss4jSecurityInterceptor. Its unsafe default permits inbound WS-Security decryption using the legacy RSA PKCS#1 v1.5 (rsa-1_5) key-transport algorithm, contrary to Apache WSS4J's safer default.
A Spring vulnerability in the same release involving failure to disable the weak RSA PKCS #1 v1.5 key transport algorithm.
A vulnerability in Spring Web Services where inbound WS-Security decryption accepts RSA PKCS#1 v1.5 key transport by default, weakening cryptographic protections and increasing exposure to attacks against the legacy rsa-1_5 key transport mechanism.
A vulnerability in Spring Web Services where RSA PKCS#1 v1.5 key transport is enabled by default.
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.