jackson-core: ReDoS: quadratic backtracking in NumberInput.PATTERN_FLOAT via looksLikeValidNumber()

Status FULLY REPRODUCED with a clean, textbook empirical signature: measured runtime grew almost exactly 4x for every doubling of input size across five consecutive doublings 5,000 → 160,000 characters, confirming On² behavior. A single 160,000-character string smaller than a typical HTTP request...

Regular Expression Denial of Service (ReDoS)

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 Regular Expression Denial of Service ReDoS in the PATTERNFLOAT regex of NumberInput, reached through looksLikeValidNumber,...

Regular Expression Denial of Service (ReDoS)

Overview Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS in the PATTERNFLOAT regex of NumberInput, reached through looksLikeValidNumber, where adjacent quantifiers over the same character class 0-9, then an optional ., then 0-9+ carry no possessive...

CVE-2026-89407 jackson-core: quadratic backtracking in NumberInput.PATTERN_FLOAT via looksLikeValidNumber() enables ReDoS

NumberInput.looksLikeValidNumber in FasterXML jackson-core pre-validates "stringified numbers" with two regular expressions: PATTERNFLOAT +-?0-9.?0-9+eE+-?0-9+?, present since 2.17.0, and PATTERNFLOATTRAILINGDOT, added in 2.17.2. PATTERNFLOAT places adjacent quantifiers over the same character...

CVE-2026-89407 jackson-core: quadratic backtracking in NumberInput.PATTERN_FLOAT via looksLikeValidNumber() enables ReDoS

NumberInput.looksLikeValidNumber in FasterXML jackson-core pre-validates "stringified numbers" with two regular expressions: PATTERNFLOAT +-?0-9.?0-9+eE+-?0-9+?, present since 2.17.0, and PATTERNFLOATTRAILINGDOT, added in 2.17.2. PATTERNFLOAT places adjacent quantifiers over the same character...

CVE-2026-89407

FasterXML jackson-core (versions 2.17.0+) is vulnerable to a ReDoS (Regular Expression Denial of Service) in NumberInput.looksLikeValidNumber(). The PATTERN_FLOAT regex uses adjacent quantifiers over the same character class, causing quadratic backtracking when an input ultimately fails to match....