FasterXML jackson-core up to 2.12.x JsonLocation._appendSourceDesc information exposure

Summaryinfo

A vulnerability, which was classified as problematic, has been found in FasterXML jackson-core up to 2.12.x. Affected is the function JsonLocation._appendSourceDesc. The manipulation leads to information exposure. This vulnerability is referenced as CVE-2025-49128. The attack can only be performed from a local environment. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in FasterXML jackson-core up to 2.12.x and classified as problematic. This issue affects the function JsonLocation._appendSourceDesc. The manipulation with an unknown input leads to a information exposure vulnerability. Using CWE to declare the problem leads to CWE-209. The product generates an error message that includes sensitive information about its environment, users, or associated data. Impacted is confidentiality. The summary by CVE is:

Jackson-core contains core low-level incremental ("streaming") parser and generator abstractions used by Jackson Data Processor. Starting in version 2.0.0 and prior to version 2.13.0, a flaw in jackson-core's `JsonLocation._appendSourceDesc` method allows up to 500 bytes of unintended memory content to be included in exception messages. When parsing JSON from a byte array with an offset and length, the exception message incorrectly reads from the beginning of the array instead of the logical payload start. This results in possible information disclosure in systems using pooled or reused buffers, like Netty or Vert.x. This issue was silently fixed in jackson-core version 2.13.0, released on September 30, 2021, via PR #652. All users should upgrade to version 2.13.0 or later. If upgrading is not immediately possible, applications can mitigate the issue 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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2025-49128 since 06/02/2025. The exploitation is known to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 240316 (Amazon Linux 2023 : aws-kinesis-agent (ALAS2023-2025-1024)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.13.0 eliminates this vulnerability. Applying the patch a6c297682737dde13337cb7c3020f299518609a8 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (240316) and EUVD (EUVD-2025-17366). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Programming Language Software

Vendor

• FasterXML

Name

• jackson-core

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12

License

• open-source

Website

• Product: https://github.com/FasterXML/jackson-core/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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