Vulnerability · Published Oct 20, 2026 · Assigned by VulnCheck
CVE-2026-113602json-smart through 2.6.0 Strict-Mode Validation Bypass via 0x1A Character
Medium 5.3
In plain English
A medium-severity security flaw in json-smart from json-smart. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 60.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
json-smart through 2.6.0 contains an input validation bypass vulnerability that allows attackers to evade strict-mode trailing-data checks by inserting a literal 0x1A character. Attackers can append 0x1A and malformed content to pass JSONValue.parseStrict or isValidJsonStrict validation, creating parser differentials with downstream parsers like Jackson or Gson.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | json-smart | no fix listed | DEBIAN-CVE-2026-113602 |
| Debian:13 | json-smart | no fix listed | DEBIAN-CVE-2026-113602 |
| Debian:14 | json-smart | no fix listed | DEBIAN-CVE-2026-113602 |
| Ubuntu:22.04:LTS | json-smart | no fix listed | UBUNTU-CVE-2026-113602 |
| Ubuntu:24.04:LTS | json-smart | no fix listed | UBUNTU-CVE-2026-113602 |
| Ubuntu:26.04:LTS | json-smart | no fix listed | UBUNTU-CVE-2026-113602 |
| Ubuntu:26.10 | json-smart | no fix listed | UBUNTU-CVE-2026-113602 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| json-smart | json-smart | 0 – through 2.6.0 |
Weakness: CWE-147 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- https://github.com/netplex/json-smart-v2/issues/302 issue-tracking
- https://github.com/netplex/json-smart-v2/blob/v2.6.0/json-smart/src/main/java/net/minidev/json/parser/JSONParserBase.java technical-description
- VulnCheck Advisory: json-smart through 2.6.0 Strict-Mode Validation Bypass via 0x1A Character third-party-advisory