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CVE-2026-40988: An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Log

38
Routine
HIGH 7.5REMOTEUPGRADE

CVE-2026-40988 is a high-severity flaw (CVSS 7.5) affecting spring security. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 74%)
CISA exploited listNo
WeaknessCWE-400
Published2026-06-10
Last modified2026-07-23
Publisher (CNA): VMware · Vendor: vmware

Share: LinkedIn · X · Reddit

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

vmware spring security UPGRADE
Affected: >= 5.7.0 and < 5.7.24 · >= 5.8.0 and < 5.8.26 · >= 6.3.0 and < 6.3.17 · >= 6.4.0 and < 6.4.17 · >= 6.5.0 and < 6.5.10.2 · >= 7.0.0 and < 7.0.5.1
Fixed in: 5.7.24, 5.8.26, 6.3.17, 6.4.17, 6.5.10.2, 7.0.5.1
Safe to downgrade to: a release before 5.7.0
1. Check installed version
apt-cache policy spring-security || rpm -q spring-security || spring-security --version
2. UPGRADE to 5.7.24 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade spring-security
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade spring-security
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 5.7.0 (Debian / Ubuntu)
apt-cache madison spring-security sudo apt install spring-security=<VERSION_BEFORE_5.7.0> sudo apt-mark hold spring-security
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list spring-security sudo dnf downgrade spring-security-<VERSION_BEFORE_5.7.0> sudo dnf versionlock add spring-security
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40988?

spring security: upgrade to 5.7.24, 5.8.26, 6.3.17, 6.4.17, 6.5.10.2, 7.0.5.1. Exact commands for each OS are on this page.

Is CVE-2026-40988 being exploited?

CVE-2026-40988 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40988 affect?

CVE-2026-40988 affects spring security. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2026-40988?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Software pages

VMware vulnerabilities

Related CVEs

References

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