CVE-2026-22735 — spring-webmvc
LOWCVE-2026-22735 is a low-severity (CVSS 2.6) CWE-667 vulnerability in org.springframework:spring-webmvc. A fix is available for org.springframework:spring-webmvc — see the affected versions and patch details below.
Spring MVC and WebFlux has Server Sent Event stream corruption
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-22735.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2026-22735 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
org.springframework:spring-webmvc☕org.springframework:spring-webmvc☕org.springframework:spring-webmvc☕org.springframework:spring-webmvc☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webflux☕org.springframework:spring-webfluxReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
Spring MVC and WebFlux applications are vulnerable to stream corruption when using Server-Sent Events (SSE). This issue affects Spring Foundation: from 7.0.0 through 7.0.5, from 6.2.0 through 6.2.16, from 6.1.0 through 6.1.25, from 5.3.0 through 5.3.46.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.springframework:spring-webmvc | ≥ 7.0.0-M1&&< 7.0.6 | 7.0.6org.springframework:spring-webmvc:7.0.6 |
| ☕Maven | org.springframework:spring-webmvc | ≥ 6.2.0&&< 6.2.17 | 6.2.17org.springframework:spring-webmvc:6.2.17 |
| ☕Maven | org.springframework:spring-webmvc | ≥ 6.0.0 | No fix |
| ☕Maven | org.springframework:spring-webmvc | ≥ 5.3.0 | No fix |
| ☕Maven | org.springframework:spring-webflux | ≥ 7.0.0-M1&&< 7.0.6 | 7.0.6org.springframework:spring-webflux:7.0.6 |
| ☕Maven | org.springframework:spring-webflux | ≥ 6.2.0&&< 6.2.17 | 6.2.17org.springframework:spring-webflux:6.2.17 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.springframework:spring-webmvc, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.springframework:spring-webmvc to 7.0.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-22735 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-22735 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-22735. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2026-22735 in your dependencies?
O3 Security finds CVE-2026-22735 across Maven dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.