CVE-2026-59279
Last modified
CVE-2026-59279 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The MCP Streamable HTTP server transport (WebFlux and WebMvc variants) does not place any limit on the number of sessions it retains, and by default does not require clients to be authenticated. As a result, a remote attacker can cause the server to accumulate an unbounded number of sessions over time, gradually exhausting available memory and ultimately causing a Denial of Service that affects all legitimate clients. Affected versions: Spring AI: 2.0.0. EPSS estimates a 0.55% chance of exploitation in the next 30 days.
Description
The MCP Streamable HTTP server transport (WebFlux and WebMvc variants) does not place any limit on the number of sessions it retains, and by default does not require clients to be authenticated. As a result, a remote attacker can cause the server to accumulate an unbounded number of sessions over time, gradually exhausting available memory and ultimately causing a Denial of Service that affects all legitimate clients. Affected versions: Spring AI: 2.0.0
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Vmware | Spring Ai | >= 2.0.0, < 2.0.1 |
References
- https://spring.io/security/cve-2026-59279Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-59279?
How severe is CVE-2026-59279?
How do I fix CVE-2026-59279?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-59272Any application shipping logs to RabbitMQ over TLS via the L…6.8
- CVE-2026-59274The UnZipTransformer does not limit decompressed entry size …6.5
- CVE-2026-59275A single hostile AMQP message can terminate the entire consu…4.9
- CVE-2026-59276Several components in Spring Security compare security-sensi…5.9
- CVE-2026-59277Spring Security's InetAddressMatchers utility provides match…5.3
- CVE-2026-59278JsonKafkaHeaderMapper and DefaultKafkaHeaderMapper include j…6.5
- CVE-2026-5928Calling the ungetwc function on a FILE stream with wide char…7.5
- CVE-2026-59280Applications using Spring Framework's FreeMarker integration…4.3
- CVE-2026-59281Spring MVC and WebFlux applications that obtain a data-bindi…6.1
- CVE-2026-59282Spring Framework applications that use Spring's data binding…7.5
- CVE-2026-59283Applications that evaluate Spring Expression Language (SpEL)…9.1
- CVE-2026-59284There is no allow list for property keys when Spring Cloud C…7.6
Are you affected by CVE-2026-59279?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST