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No exploitation reportedFix available

CVE-2022-31117

No exploitation reported by the sources we read.

  • Published2022-07-05
  • WeaknessCWE-415

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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 decoding can cause the buffer to get freed twice. Due to how UltraJSON uses the internal decoder, this double free is impossible to trigger from Python. This issue has been resolved in version 5.4.0 and all users should upgrade to UltraJSON 5.4.0. There are no known workarounds for this issue.

Timeline

dates in UTC
  1. 2022-07-0518:15CVE publishedNVD

Versions per branch

NVD · OSV
Fedoraproject fedora
BranchAffectedFixed in
35.x= 35no fix published
36.x= 36no fix published
Ultrajson project ultrajson
BranchAffectedFixed in
5.4< 5.4.05.4.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • ultrajson
    Affected
    • = < 5.4.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-08-03

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • pandasUbuntu:26.10all versions · no fixed version listed
  • pandasUbuntu:26.04:LTSall versions · no fixed version listed
  • pandasUbuntu:25.10all versions · no fixed version listed
  • pandasUbuntu:24.04:LTSall versions · no fixed version listed
  • pandasUbuntu:22.04:LTSall versions · no fixed version listedand 1 other package
  • pandasUbuntu:20.04:LTSall versions · no fixed version listed
  • pandasUbuntu:18.04:LTSall versions · no fixed version listedand 1 other package
  • pandasUbuntu:16.04:LTSall versions · no fixed version listedand 1 other package

29 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2025-04-23
  • CNACVSS 3.15.9known since 2026-10-23
  • NVDCVSS 3.15.9read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • CNAweakness (CWE)CWE-415known since 2026-10-23
  • FIRST EPSSEPSS score1.9 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2022-07-05

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-07-05
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-fm67-cv37-96ff

Frequently asked questions

What is CVE-2022-31117?

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 decoding can cause the buffer to get freed twice. Due to how UltraJSON uses the internal decoder, this double free is impossible to trigger from Python. This issue has been resolved in version 5.4.0 and all users should upgrade to UltraJSON 5.4.0. There are no known workarounds for this issue.

Is CVE-2022-31117 actively exploited?

Active exploitation of CVE-2022-31117 has not been confirmed. Its EPSS score was 1.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-31117?

CVE-2022-31117 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

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