HighCVE-2026-89407

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

    Published Last modified Sources: Red Hat, CVE.org, OSV, Hersteller, BSI, SUSE

    What is affected, what to do

    A flaw was found in jackson-core. An attacker can supply specially crafted JSON that, when deserialized into a numeric target type, triggers a Regular expression Denial of Service (ReDoS) vulnerability.

    An exploit is publicly available. Update JobScheduler to version 2.8.5.

    Affected
    • FasterXML Jackson-core lte 2.17.0..2.18.10
    • FasterXML Jackson-core lte 2.19.0..2.21.6
    • FasterXML Jackson-core lte 2.22.0..2.22.2
    • FasterXML Jackson-core lte 3.0.0..3.1.6
    • FasterXML Jackson-core lte 3.2.0..3.2.1

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Red Hat, CVE.org, OSV, Hersteller, BSI, SUSE

    0.6 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 50.1

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    85.54 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    PoC (publicly reported)
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.6 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    50.1
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: proof of concept · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 22 September 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-1333, CWE-400

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A flaw was found in jackson-core. An attacker can supply specially crafted JSON that, when deserialized into a numeric target type, triggers a Regular expression Denial of Service (ReDoS) vulnerability. This occurs due to quadratic backtracking in the NumberInput.looksLikeValidNumber() method's PATTERN_FLOAT regular expression. A small number of concurrent requests with a long input string can exhaust a server's request-handling thread pool, leading to a Denial of Service (DoS).

    Source: redhat_csaf, NVD (NIST), cvelistv5, OSV (Open Source Vulnerabilities), GitHub Security Advisories, BSI WID Portal, BSI CSAF, suse_csaf

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    FasterXMLjackson-core
    • 2.22.0 – ≤ 2.22.2
    • 3.0.0 – ≤ 3.1.6
    • 2.17.0 – ≤ 2.18.10
    • 3.2.0 – ≤ 3.2.1
    • 2.19.0 – ≤ 2.21.6
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    SOS GmbHJobScheduler
    • < 2.8.5
    • 2.8.5
    mavencom.fasterxml.jackson.core:jackson-core
    • 2.21.0
    • 2.17.2
    • 2.19.3
    • 2.19.1
    • 2.18.0-rc1
    • 2.20.2
    • 2.18.0
    • 2.21.1
    • 2.22.2
    • 2.19.4
    • 2.18.7
    • 2.21.2
    • 2.21.5
    • 2.18.1
    • 2.22.1
    • 2.18.6
    • 2.21.6
    • 2.18.4.1
    • 2.18.4
    • 2.20.1
    • 2.21.3
    • 2.19.0
    • 2.20.0
    • 2.17.1
    • 2.18.3
    • 2.17.3
    • 2.19.2
    • 2.18.8
    • 2.22.0
    • 2.18.5
    • 2.18.10
    • 2.17.0
    • 2.18.2
    • 2.20.0-rc1
    • 2.21.4
    • 2.18.9
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    maventools.jackson.core:jackson-core
    • 3.0.2
    • 3.1.3
    • 3.0.0
    • 3.0.3
    • 3.1.6
    • 3.1.4
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    Vendors and products

    Weakness classes (CWE)

    • CWE-1333Inefficient Regular Expression Complexity

      Base

      The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

      Entry at MITRE CWE-1333

    • CWE-400Uncontrolled Resource Consumption

      Class

      The product does not properly control the allocation and maintenance of a limited resource.

      Entry at MITRE CWE-400

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    CIRCL Sightingsgithub.com (opens in a new tab)PoC (publicly reported)reported, not verified

    References & sources

    • github.comGHSA-p6pp-m3f8-5c89Vendor advisory
    • github.comFasterXML/jackson-core#1649Issue tracking
    • github.comFasterXML/jackson-core#1650Patch
    • github.comFasterXML/jackson-core#1701 (2.18 backport)Patch
    • NVD (NIST)vuln/detail/CVE-2026-89407advisory
    • github.comFasterXML/jackson-core/commit/731e794f62623aa0d86ced52490166be9…web
    • github.comFasterXML/jackson-core/commit/e7acd64cc99bd346704423dc2bfea1ab0…web
    • github.comFasterXML/jackson-corepackage

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: proof of concept, automatable: yes

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://github.com/FasterXML/jackson-core/security/advisories/GHSA-p6pp-m3f8-5c89
      SSVC assessmentadded
      —
      {"id":"CVE-2026-89407","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-09-22T15:52:15.349840Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. Received36c7be3b…

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

      Weakness type: CWE-400, CWE-1333

      Description added or changed

      Show 9 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      NumberInput.looksLikeValidNumber() in FasterXML jackson-core pre-validates "stringified numbers" with two regular expressions: PATTERN_FLOAT ([+-]?[0-9]*[\.]?[0-9]+([eE][+-]?[0-9]+)?), present since 2.17.0, and PATTERN_FLOAT_TRAILING_DOT, added in 2.17.2. PATTERN_FLOAT places adjacent quantifiers over the same character class -- an optional [0-9]* run, an optional dot, then a required [0-9]+ run -- so input that ultimately fails to match forces Java's backtracking engine to retry every possible split point of the digit run.  Matching cost therefore grows with the square of the input length.  An attacker who can supply JSON that an application deserializes into a numeric target type reaches this method through jackson-databind's default String-to-number coercion (StdDeserializer and NumberDeserializers for BigDecimal, BigInteger, Double and Float).  Because StreamReadConstraints.maxStringLength defaults to 20,000,000 characters, no constraint bounds the input before it reaches the regex.  Testing by the reporter confirmed O(n^2) growth across five consecutive input-size doublings, with a single 160,000-character string consuming roughly 74 seconds in one call; a small number of concurrent requests of ordinary body size can therefore exhaust a server's request-handling thread pool.  The affected method does not exist before 2.17.0, so 2.16.x and earlier releases are not affected.  The fix replaces both regular expressions with a hand-rolled single-pass scan.
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
      Weakness type (CWE)added
      —
      CWE-400
      Weakness type (CWE)added
      —
      CWE-1333
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89407.json">CVE-2026-89407</a>
      Referenceadded
      —
      https://github.com/FasterXML/jackson-core/issues/1649
      Referenceadded
      —
      https://github.com/FasterXML/jackson-core/pull/1650
      Referenceadded
      —
      https://github.com/FasterXML/jackson-core/pull/1701
      Referenceadded
      —
      https://github.com/FasterXML/jackson-core/security/advisories/GHSA-p6pp-m3f8-5c89

      Source identifier: 36c7be3b-2937-45df-85ea-ca7133ea542c

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