Description
Spring WebFlux applications may be vulnerable to a security bypass when using the Kotlin Router DSL.
Affected versions:
Spring Framework 5.3.0 through 5.3.48.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Spring | Spring Framework | 5.3.0 – < 5.3.49 | 5.3.49 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libspring-java | No fix yet | — |
| Debian 13 | libspring-java | No fix yet | — |
| Debian 12 | libspring-java | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libspring-java | No fix yet | — |
| Ubuntu 26.04 LTS | libspring-java | No fix yet | — |
| Ubuntu 25.10 | libspring-java | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | libspring-java | No fix yet | — |
| Ubuntu Pro 22.04 LTS | libspring-java | No fix yet | — |
| Ubuntu Pro 20.04 LTS | libspring-java | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libspring-java | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libspring-java | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libspring-java | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.springframework:spring-webflux | <= 5.3.39 | — | GHSA-vqgp-pf68-6947 |
Advisories 1
- WID-SEC-2026-1828 VMware Tanzu Spring Framework: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2026