EUVD-2026-35883
GHSA-m69x-pw9p-7j3q
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (vmware) · only source for this CVE.
CVSS VectorVendor: vmware
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Denial of service in Spring Security's SAML 2.0 service provider module allows remote unauthenticated attackers to exhaust application memory by submitting a maliciously compressed SAML payload over the REDIRECT binding. The flaw stems from an unbounded inflater that decompresses attacker-controlled data without size limits, enabling a classic decompression-bomb attack against any Spring application using SAML Login or Logout. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target application must include the spring-security-saml2-service-provider dependency and have SAML 2.0 Login or Logout configured to use the REDIRECT binding, with the SAML endpoints reachable by the attacker (typically internet-exposed for federated SSO). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) describes a high-impact availability attack reachable over the network with no authentication, no user interaction, and low complexity - a strong signal for prioritization in any internet-exposed SAML deployment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a SAML 2.0 message containing highly compressible padding (e.g., a long run of identical bytes that DEFLATE reduces to a few hundred bytes), base64-encodes it, and submits it as the SAMLRequest query parameter to the target's SAML SSO or SLO endpoint over the REDIRECT binding. The Spring Security filter inflates the payload into JVM heap without a size cap, and a small number of concurrent requests exhausts memory, triggering OutOfMemoryError and taking the SSO-protected application offline. … |
| Remediation | Patch available per vendor advisory at https://spring.io/security/cve-2026-40988 - upgrade to the next patched maintenance release in each affected branch (5.7.24+, 5.8.26+, 6.3.17+, 6.4.17+, 6.5.11+, 7.0.6+ as released by VMware/Broadcom; verify exact fix version against the Spring advisory before deployment). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all applications using Spring Security with SAML Login or Logout (search build artifacts for spring-security-saml2-service-provider dependency). …
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