Information Exposure Affecting com.fasterxml.jackson.core:jackson-core package, versions [2.0.0,2.13.0-rc1)
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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Start learning- Snyk IDSNYK-JAVA-COMFASTERXMLJACKSONCORE-10332631
- published8 Jun 2025
- disclosed6 Jun 2025
- creditGreg Wittel
Introduced: 6 Jun 2025
NewCVE-2025-49128 (opens in a new tab)How to fix?
Upgrade com.fasterxml.jackson.core:jackson-core to version 2.13.0-rc1 or higher.
Overview
com.fasterxml.jackson.core:jackson-core is a Core Jackson abstractions, basic JSON streaming API implementation
Affected versions of this package are vulnerable to Information Exposure due to the JsonLocation._appendSourceDesc method. An attacker can access up to 500 bytes of unintended memory content by exploiting exception messages that incorrectly read from the beginning of a byte array instead of the logical payload start.
Workaround
This vulnerability can be mitigated by disabling exception message exposure to clients to avoid returning parsing exception messages in HTTP responses and/or disabling source inclusion in exceptions to prevent Jackson from embedding any source content in exception messages, avoiding leakage.
PoC
byte[] buffer = new byte[1000];
System.arraycopy("SECRET".getBytes(), 0, buffer, 0, 6);
System.arraycopy("{ \"bad\": }".getBytes(), 0, buffer, 700, 10);
JsonFactory factory = new JsonFactory();
JsonParser parser = factory.createParser(buffer, 700, 20);
parser.nextToken(); // throws exception
// Exception message will include "SECRET"