CVE-2026-113602

json-smart through 2.6.0 Strict-Mode Validation Bypass via 0x1A Character

6.9 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: None

Exploit likelihood

0.45%Unchanged since Oct 21, 2026

What each source reports

CVE List Score used 6.9

json-smart through 2.6.0 Strict-Mode Validation Bypass via 0x1A Character

Record: CVE-2026-113602
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-147
Updated: 2026-11-02

EUVDEUVD-2026-105168 6.9

Record: EUVD-2026-105168
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-77mf-7xf5-w9wc 6.9

json-smart through 2.6.0 contains an input validation bypass vulnerability that allows attackers...

Record: GHSA-77mf-7xf5-w9wc
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-147
Updated: 2026-11-02

NVD 6.9

Record: CVE-2026-113602
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness: CWE-147
Updated: 2026-11-02

OSV 6.9

json-smart through 2.6.0 Strict-Mode Validation Bypass via 0x1A Character

Record: CVE-2026-113602
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-147
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-113602 6.9

Record: DEBIAN-CVE-2026-113602
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-113602 6.9

Record: UBUNTU-CVE-2026-113602
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated: 2026-11-02

Affected products

json-smart

Affected packages

Affected packages
Package	Affected	Fixed
`json-smart` Debian:12	All versions, plus listed versions 2.2-22.2-2+deb12u12.2-32.5.1-12.5.2-1	None known
`json-smart` Debian:13	All versions, plus listed versions 2.5.2-1	None known
`json-smart` Debian:14	All versions, plus listed versions 2.5.2-1	None known
`json-smart` Ubuntu:18.04:LTS	All versions, plus listed versions 2.2-12.2-22.2-2ubuntu0.18.04.1	None known
`json-smart` Ubuntu:20.04:LTS	All versions, plus listed versions 2.2-22.2-2ubuntu0.20.04.1	None known
`json-smart` Ubuntu:22.04:LTS	All versions, plus listed versions 2.2-22.2-2ubuntu0.22.04.1	None known
`json-smart` Ubuntu:24.04:LTS	All versions, plus listed versions 2.2-2ubuntu1	None known
`json-smart` Ubuntu:26.10	All versions, plus listed versions 2.5.2-1	None known
`json-smart` Ubuntu:26.04:LTS	All versions, plus listed versions 2.5.2-1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-113602 is a medium vulnerability (CVSS 6.9) in Json-smart, published October 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. No source names a fixed version.

References

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