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CVE-2022-31116

27
FAUCET Score

CVE-2022-31116 affects UltraJSON, a Python JSON encoder/decoder, where versions prior to 5.4.0 improperly decode escaped surrogate characters, leading to potential string corruption, key confusion, and value overwriting in dictionaries when parsing untrusted JSON. This vulnerability carries a high CVSS score of 7.5, indicating a network-based attack with low complexity and high impact on availability. While the EPSS score is low, suggesting limited real-world exploitation, there are currently no known public exploits, Metasploit modules, or Nuclei templates available. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.4.0CPE matchmatch criteria
cpe:2.3:a:ultrajson_project:ultrajson:*:*:*:*:*:python:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
36CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.30%
Probability of exploitation in next 30 days
EPSS Percentile
81.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0230 is in the 67th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: ujsonFixed in: 5.4.0
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 16.1Fixed in: python-ujson-0:2.0.3-3.el8ost
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 16.2Fixed in: python-ujson-0:2.0.3-3.el8ost
View patch

Vendor Advisories (2)

pipGHSA-wpqr-jcpx-745rhigh

Incorrect handling of invalid surrogate pair characters

Jul 5, 2022
redhatCVE-2022-31116Moderate

python-ujson: improper decoding of escaped surrogate characters may lead to string corruption, key confusion or value overwriting

Jul 2, 2022

References

github.com / ultrajson/ultrajson/commit/67ec07183342589d602e0fcf7bb1ff3e19272687
PatchThird Party Advisory
github.com / ultrajson/ultrajson/security/advisories/GHSA-wpqr-jcpx-745r
ExploitThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/NAU5N4A7EUK2AMUCOLYDD5ARXAJYZBD2
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/OPPU5FZP3LCTXYORFH7NHUMYA5X66IA7