Answer in brief
CVE-2026-40988 records a High severity (CVSS 7.5) vulnerability in Unbounded DEFLATE Inflation in SAML 2.0 Service Provider. The current sources do not mark it as known exploited. The current feed maps Spring/Spring Security (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Spring/Spring Security (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Spring/Spring Securitygeneric | >=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 <6.5.10.2 || >=7.0.0 <7.0.5.1 | 5.7.24, 5.8.26, 6.3.17, 6.4.17, 6.5.10.2, 7.0.5.1 |
Published upstream
Jun 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 27, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-40988 records a High severity (CVSS 7.5) vulnerability in Unbounded DEFLATE Inflation in SAML 2.0 Service Provider. The current sources do not mark it as known exploited. The current feed maps Spring/Spring Security (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Spring/Spring Security (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Spring/Spring Securitygeneric | >=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 <6.5.10.2 || >=7.0.0 <7.0.5.1 | 5.7.24, 5.8.26, 6.3.17, 6.4.17, 6.5.10.2, 7.0.5.1 |
Published upstream
Jun 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 27, 2026
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.
Quoted source text, attributed separately from HOL analysis.