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Advisory record · GHSA-m69x-pw9p-7j3q

Spring Security SAML2 Service Provider: Unbounded writer inflates the compressed SAML payload into memory (DoS)

CVSS 7.5 HighEPSS 0.0033 · 26th percentile

Published by the GitHub Advisory Database at 10 Jun 2026, 00:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.springframework.security:spring-security-saml2-service-providerMaven>=7.0.0, <7.0.6 || >=6.5.0, <6.5.11 || >=6.4.0, <=6.4.16 || >=6.3.0, <=6.3.16 || >=5.8.0, <=5.8.25 || <=5.7.237.0.6, 6.5.11
Identifiers
GHSA-m69x-pw9p-7j3q · CVE-2026-40988
Weakness (CWE)
CWE-400
Tags
Published
10 Jun 2026
Updated
12 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Spring Security's spring-security-saml2-service-provider module is vulnerable in versions 7.0.0 through 7.0.5, 6.5.0 through 6.5.10, 6.4.0 through 6.4.16, 6.3.0 through 6.3.16, 5.8.0 through 5.8.25, and 5.7.23 and earlier. Applications using the REDIRECT binding for SAML 2.0 Login or Logout can be driven into denial of service, because an unbounded writer inflates the compressed SAML payload into memory. Upgrade to 7.0.6 or 6.5.11, or to the fixed release on your own maintenance line.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (vmware)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 26th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.