Server-side Request Forgery (SSRF) Affecting com.github.java-json-tools:jackson-coreutils package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-COMGITHUBJAVAJSONTOOLS-19644208
- published8 Sept 2026
- disclosed7 Sept 2026
- creditUnknown
Introduced: 7 Sep 2026
NewCVE-2026-86321 (opens in a new tab)How to fix?
There is no fixed version for com.github.java-json-tools:jackson-coreutils.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) in JsonLoader.fromURL(), which fetches any URL without validation, and to memory amplification through JacksonUtils.newMapper(), which enables WRITE_BIGDECIMAL_AS_PLAIN so a BigDecimal serializes via toPlainString() with no size bound. An attacker can crash the JVM with an OutOfMemoryError, and reach internal services or local files, by getting the application to load a small JSON document such as 1e2000000000 whose plain-string serialization allocates roughly 2 GB. This requires the application to call JsonLoader.fromURL() with a user-controlled URL, or to parse untrusted JSON through the default mapper and then serialize it.
Workaround
This vulnerability can be avoided by restricting the URLs passed to JsonLoader.fromURL() to an allowlist that blocks internal and link-local addresses and non-http(s) schemes such as file://, which removes the SSRF sink and the path that fetches the amplification payload.