Ultrajson
Vendor:
First CVE: Jan 1, 2022 · Active for 4 years
7
Total CVEs
More Total CVEs than 85% of tracked products
3.5
Avg CVEs / Year
Higher CVE frequency than 84% of tracked products
6.8
Avg CVSS
Higher Avg CVSS than 42% of tracked products
0.0%
KEV Rate
Bottom 1%
Trends Over Time
The number and severity of CVEs published that impact Ultrajson over time
Volume of CVEsAvg CVSS Base Score
First CVE
Jan 1, 2022
4 years ago
Most Recent CVE
Jun 22, 2026
36 days ago
CVE Severity & Scoring
Ultrajson7 CVEs
43%
57%
All CVEs353,173 CVEs
45%
40%
11%
MediumHigh
Attack Vector
Local1 (14.3%)
Network6 (85.7%)
Unknown0 (0.0%)
Physical0 (0.0%)
Adjacent Network0 (0.0%)
Attack Complexity
Low6 (85.7%)
High1 (14.3%)
Unknown0 (0.0%)
User Interaction
None6 (85.7%)
Unknown0 (0.0%)
Required1 (14.3%)
Privileges Required
Low0 (0.0%)
High0 (0.0%)
None7 (100.0%)
Unknown0 (0.0%)
Top CVEs
Signals from CVEs in this product scope (7 CVEs).
7 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2026-32875HIGH UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.10 through 5.11.0 are vulnerable to buffer overflow or infinite loop throug | Mar 20, 2026 | 7.5 | 29 | NO | NO |
CVE-2026-32874HIGH UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Versions 5.4.0 through 5.11.0 contain an accumulating memory leak in JSON parsing larg | Mar 20, 2026 | 7.5 | 29 | NO | NO |
CVE-2022-31116HIGH UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Affected versions were found to improperly decode certain characters. JSON strings tha | Jul 5, 2022 | 7.5 | 27 | NO | NO |
CVE-2026-44660HIGH 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 operatio | May 27, 2026 | 7.5 | 26 | NO | NO |
CVE-2026-54911MEDIUM UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. Prior to 5.13.0, ujson.dumps() (or ujson.dump() or ujson.encode()) have a reject_bytes | Jun 22, 2026 | 6.5 | 24 | NO | NO |
CVE-2022-31117MEDIUM UltraJSON is a fast JSON encoder and decoder written in pure C with bindings for Python 3.7+. In versions prior to 5.4.0 an error occurring while reallocating a buffer for string d | Jul 5, 2022 | 5.9 | 23 | NO | NO |
CVE-2021-45958MEDIUM UltraJSON (aka ujson) through 5.1.0 has a stack-based buffer overflow in Buffer_AppendIndentUnchecked (called from encode). Exploitation can, for example, use a large amount of ind | Jan 1, 2022 | 5.5 | 22 | NO | NO |
Exploit Exposure
Signals from CVEs in this product scope (7 CVEs).
CISA KEV
0 CVEs
0.0% of CVEs· Bottom 1%
Metasploit
0 CVEs
0.0% of CVEs· Bottom 1%
Nuclei
0 CVEs
0.0% of CVEs· Bottom 1%
ExploitDB
0 CVEs
0.0% of CVEs· Bottom 1%
Social Chatter
Signals from CVEs in this product scope (7 CVEs).
Media Mentions
Signals from CVEs in this product scope (7 CVEs).
Top CNAs Publishing CVEs For Ultrajson
Top CWEs
Versions
No cataloged versions.