CVE-2025-57052

Publication date 3 September 2025

Last updated 26 January 2026

Ubuntu priority

Cvss 3 Severity Score

Description

cJSON 1.5.0 through 1.7.18 allows out-of-bounds access via the decode_array_index_from_pointer function in cJSON_Utils.c, allowing remote attackers to bypass array bounds checking and access restricted data via malformed JSON pointer strings containing alphanumeric characters.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
cjson	26.04 LTS resolute	Not affected
	25.10 questing	Fixed 1.7.18-3.1ubuntu0.1
	25.04 plucky	Ignored end of life, was needed
	24.04 LTS noble	Fixed 1.7.17-1ubuntu0.1~esm3
	22.04 LTS jammy	Fixed 1.7.15-1ubuntu0.1
	20.04 LTS focal	Fixed 1.7.10-1.1ubuntu0.1~esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
cjson	Upstream: 74e1ff4

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-7973-1
cJSON vulnerabilities
23 January 2026