CVE-2026-44660

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Source
https://cve.org/CVERecord?id=CVE-2026-44660
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-44660.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-44660
Aliases
Downstream
Related
Published
2026-05-27T20:42:59.830Z
Modified
2026-06-03T03:54:55.980951898Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
UltraJSON: Memory Leak in ujson.dump() on Write Failure
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44660.json",
    "cwe_ids": [
        "CWE-401"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/ultrajson/ultrajson

Affected ranges

Type
GIT
Repo
https://github.com/ultrajson/ultrajson
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7d9036f4896256ac772fdb45d27d45463efe59cb

Affected versions

2.*
2.0.0
2.0.1
2.0.2
2.0.3
3.*
3.0.0
3.1.0
3.2.0
4.*
4.0.0
4.0.1
4.0.2
4.1.0
4.2.0
4.3.0
5.*
5.0.0
5.1.0
5.10.0
5.11.0
5.12.0
5.2.0
5.3.0
5.4.0
5.5.0
5.6.0
5.7.0
5.8.0
5.9.0
v1.*
v1.34
v1.35

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-44660.json"