CVE-2026-33210
No exploitation reported by the sources we read.
- Published2026-03-20
- Fixed in2.19.2 · 2.17.1.2 · 2.15.2.1
- WeaknessCWE-134
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « 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
Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.
Timeline
dates in UTC- 2026-03-2023:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-33210?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-33210?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.x | ≥ 2.18.0, < 2.19.2 | 2.19.2 | NVD · OSV |
| 2.x | ≥ 2.16.0, < 2.17.1.2 | 2.17.1.2 | NVD · OSV |
| 2.x | ≥ 2.14.0, < 2.15.2.1 | 2.15.2.1 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
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
- rubyAlmaLinux:9all versions · fixed in 4.0.3-32.module_el9.8.0+251+5fdbd96band 5 other packages
- ruby4.0AlmaLinux:10all versions · fixed in 4.0.3-34.el10_2and 2 other packages
- ruby4.0-rubygem-mysql2AlmaLinux:10all versions · fixed in 0.5.7-34.el10_2
- ruby4.0-rubygem-pgAlmaLinux:10all versions · fixed in 1.6.3-34.el10_2
- rubygem-bigdecimalAlmaLinux:9all versions · fixed in 4.0.1-32.module_el9.8.0+251+5fdbd96b
- rubygem-io-consoleAlmaLinux:9all versions · fixed in 0.8.2-32.module_el9.8.0+251+5fdbd96b
- rubygem-irbAlmaLinux:9all versions · fixed in 1.16.0-32.module_el9.8.0+251+5fdbd96b
- rubygem-jsonAlmaLinux:9all versions · fixed in 2.18.0-32.module_el9.8.0+251+5fdbd96b
14 more package ranges on OSV.dev
Fix
- Update Ruby-lang json to 2.19.2 · 2.17.1.2 · 2.15.2.1
Advisories and patches
- github.comMitigation · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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
- Published
- 2026-03-20
- Last Modified
- 2026-08-21
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-33210?
Is CVE-2026-33210 actively exploited?
What is the CVSS score for CVE-2026-33210?
Running json? Hear about its next vulnerability
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.