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NVD Vulnerability Details :
CVE-2026-44660
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-27 May, 2026 | 21:16
Updated At-02 Jun, 2026 | 18:00

UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.12.1, when ujson.dump() writes to a file-like object and the write operation raises an exception, the serialized JSON string object is not decremented, leaking memory. Each failed write operation leaks the full size of the serialized payload. This vulnerability is fixed in 5.12.1.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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
Type: Primary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CPE Matches
ultrajson_project
ultrajson_project
>>ultrajson>>Versions before 5.12.1(exclusive)
cpe:2.3:a:ultrajson_project:ultrajson:*:*:*:*:*:python:*:*
Weaknesses
CWE IDTypeSource
CWE-401Secondarysecurity-advisories@github.com
CWE ID: CWE-401
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/ultrajson/ultrajson/commit/82af1d0ac01d09aa40c887b460d44b9d9f4bccd9security-advisories@github.com
Patch
https://github.com/ultrajson/ultrajson/releases/tag/5.12.1security-advisories@github.com
Product
Release Notes
https://github.com/ultrajson/ultrajson/security/advisories/GHSA-c38f-wx89-p2xgsecurity-advisories@github.com
Exploit
Mitigation
Patch
Vendor Advisory
https://github.com/ultrajson/ultrajson/security/advisories/GHSA-c38f-wx89-p2xg134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Mitigation
Patch
Vendor Advisory
Hyperlink: https://github.com/ultrajson/ultrajson/commit/82af1d0ac01d09aa40c887b460d44b9d9f4bccd9
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/ultrajson/ultrajson/releases/tag/5.12.1
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/ultrajson/ultrajson/security/advisories/GHSA-c38f-wx89-p2xg
Source: security-advisories@github.com
Resource:
Exploit
Mitigation
Patch
Vendor Advisory
Hyperlink: https://github.com/ultrajson/ultrajson/security/advisories/GHSA-c38f-wx89-p2xg
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Mitigation
Patch
Vendor Advisory
Change History
0Changes found
Details not found