Bug#1148826: jackson-core: CVE-2026-89425

[Salvatore Bonaccorso]

Source: jackson-core
Version: 2.14.1-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>
Control: found -1 2.14.1-2~deb13u1 

Hi,

The following vulnerability was published for jackson-core.

CVE-2026-89425[0]:
| UTF8DataInputJsonParser._reportInvalidToken() in FasterXML jackson-
| core builds the offending-token text for its error message by
| appending Java identifier characters to a StringBuilder in a loop
| that has no upper bound. Unlike the three sibling parser
| implementations, including UTF8StreamJsonParser, it never consults
| ErrorReportConfiguration.getMaxErrorTokenLength() (default 256). A
| malformed token supplied to a parser created through
| JsonFactory.createParser(DataInput) is therefore accumulated in
| full. No StreamReadConstraints setting mitigates this:
| maxDocumentLength cannot be applied to DataInput sources at all, and
| maxStringLength does not cover this path because the accumulation
| bypasses ReadConstrainedTextBuffer. The reporter measured a
| 20,000,109-character exception message from a 20-million-character
| malformed token on the DataInput path, against 367 characters for
| identical input on the InputStream path. Scaling the payload drives
| the StringBuilder, which also incurs byte-to-char expansion and
| internal array doubling, to many times the raw payload size and can
| trigger OutOfMemoryError for the whole JVM. UTF8DataInputJsonParser
| was introduced in 2.8.0 together with createParser(DataInput);
| releases before 2.8.0 do not contain the affected class.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-89425
    https://www.cve.org/CVERecord?id=CVE-2026-89425
[1] https://github.com/FasterXML/jackson-core/security/advisories/GHSA-7hhh-6rmp-j9qf
[2] https://github.com/FasterXML/jackson-core/pull/1698 

Regards,
Salvatore