CVE-2026-40988
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
An application using spring-security-saml2-service-provider with the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.
Risk Assessment
An attacker can overload the server, causing memory exhaustion and service disruption, leading to application unavailability.
Recommendation
Update Spring Security to a patched version (e.g., 5.7.24, 5.8.26, 6.3.17, 6.4.17, 6.5.11, 7.0.6 or later).
Other vulnerabilities in Spring Security
See all- CVE-2014-0097High
The ActiveDirectoryLdapAuthenticator in Spring Security versions 3.2.0 to 3.2.1 and 3.1.0 to 3.1.5 does not check the password length. If the directory allows anonymous binds, it may incorrectly authenticate a user who supplies an empty password.
- CVE-2026-59270Critical
Spring Security's embedded UnboundID LDAP server (UnboundIdContainer) unconditionally registers an administrative credential and binds its listener to all available network interfaces. Affected versions include Spring Security 7.1.0, 7.0.0-7.0.6, 6.5.0-6.5.11, 6.4.0-6.4.18, 5.8.0-5.8.27, and 5.7.0-5.7.25.
- CVE-2026-59277Low
Spring Security's InetAddressMatchers utility provides matchInternal() and matchExternal() builders for constructing an InetAddressMatcher that classifies a given IP address as internal (private) or external (public). Affects Spring Security 7.1.0.
- CVE-2026-59276Medium
Several components in Spring Security compare security-sensitive values using standard string equality (String.equals()) rather than a constant-time comparison. Because String.equals() returns as soon as it finds a differing character, the time taken to reject an incorrect value is proportional to the number of leading characters that match the expected value.
- CVE-2026-47877High
Spring Security Authorization Server versions 7.1.0 and 7.0.0-7.0.6 are vulnerable because the default consent page renders user-controlled values without HTML entity encoding.
- CVE-2026-47842Medium
Applications using AesBytesEncryptor with the two-argument constructor or when passing a null IV generator and CBC as the encryption mode encrypt data with AES/CBC using a null (all-zero) initialization vector. Affected versions include Spring Security 5.7.0 through 7.1.0.
- CVE-2026-47841High
An application using Spring Security's WebAuthn support may be vulnerable to user verification bypass when using a distributed HTTP session store. Affected versions: Spring Security 7.1.0, 7.0.0-7.0.6, 6.5.0-6.5.11, 6.4.0-6.4.18.
- CVE-2026-41707High
Authentication Bypass by Capture-replay vulnerability in Spring Security allows Spring Security's DPoPProofJwtDecoderFactory to contain a cache-based replay attack vulnerability. The internal cache storing JWT ID claims has a strict size limit, allowing attackers to evict legitimate entries by flooding the server with dummy requests, then replay intercepted valid DPoP proofs.
- CVE-2026-47838Medium
The SubjectDnX509PrincipalExtractor in Spring Security does not correctly handle certain malformed X.509 certificate CN values, potentially reading the wrong username. A crafted certificate could allow an attacker to impersonate another user. Affected versions: 5.7.0-5.7.24, 5.8.0-5.8.26, 6.3.0-6.3.17, 6.4.0-6.4.17, 6.5.0-6.5.10.
- CVE-2026-41706Medium
A vulnerability in Spring Security's CookieRequestCache and CookieServerRequestCache stores the full absolute pre-authentication URL in a browser cookie. After login, the user is redirected to this URL without validation, enabling an open redirect attack.
Original NVD description (English source)
An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.