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VulnerabilityPublished

CVE-2026-59171: stleary JSON-java · Uncontrolled Resource Consumption

Affects stleary JSON-javaSource CVE Database V5

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Not known to be exploited · CVSS 5.9 Medium.

Data as of 6 Nov 2026, 21:03 UTC

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.15.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
stlearyJSON-javaAffected
  • =>= 20150729, < 20260719
Fixed in–

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AI-suggested

Upgrade to JSON-java version 20260719 or later, which limits numeric conversion length and mitigates the vulnerability. No other configuration changes (such as strict mode or keep-strings) prevent exploitation. Patch status is confirmed by the introduction of the fix in version 20260719.

Description

CVE-2026-59171 is a vulnerability in the JSON-java library (stleary) affecting versions from 20150729 through 20260522. The flaw allows unbounded accumulation of numeric tokens in JSONTokener.nextSimpleValue, leading to excessive CPU consumption when converting large numeric literals. This can cause denial of service by blocking request-handling threads. The issue is not mitigated by strict mode or keep-strings settings. Version 20260719 introduces a limit on numeric conversion length to address this.

References

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