Information disclosure via ignored byte-array offset
Published Jun 6, 2025 · Updated Jun 9, 2025
Information disclosure in FasterXML Jackson Core 2.x before 2.13.0 allows attackers to read residual buffer data via malformed JSON. The JsonLocation._appendSourceDesc method ignores the byte-array offset supplied to JsonFactory.createParser and copies from index zero into exception text. Exposure requires a reused or pooled buffer, source inclusion, a parsing error, and propagation of the exception; up to 500 bytes can be disclosed.
Summary
What happened
Information disclosure in FasterXML Jackson Core 2.x before 2.13.0 allows attackers to read residual buffer data via malformed JSON. The JsonLocation._appendSourceDesc method ignores the byte-array offset supplied to JsonFactory.createParser and copies from index zero into exception text. Exposure requires a reused or pooled buffer, source inclusion, a parsing error, and propagation of the exception; up to 500 bytes can be disclosed.
The record
- CVE
- CVE-2025-49128
- Published
- Jun 6, 2025
- Updated
- Jun 9, 2025
- Vendor
- FasterXML
- Product
- Jackson Core
- Classifications
- CWE-209, T1005
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 6, 2025CVE publishedPublication date reported by the CVE source.
- Jun 9, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 2.0.0, < 2.13.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream residual-buffer disclosure proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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