Evidence used
- No CISA KEV confirmation is currently recorded.
- The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
- EPSS is 1.01% for the current model date.
BlackTreeCVE Intelligenceruby · json
Official source article: GitHub GHSA-3M6G-2423-7CP3 ↗. Check the applicable product and release in the original source.
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | ruby-json | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian bookwormbookworm · source | ruby-json | Not affectedDebian marks this release not affected (fixed-version marker 0). | Not published in this feed | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian forkyforky · source | ruby-json | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.19.2+dfsg-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Debian sidsid · source | ruby-json | Vendor fix publishedDebian records a fixed source-package version for this release. | 2.19.2+dfsg-1 | Debian Security Tracker ↗Source updated 6 Oct 2026 |
| Ubuntu 24.04 LTSnoble · standard archive | ruby-json | Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing. | Not published in this feed | Canonical Ubuntu Security ↗Source updated 6 Oct 2026 |
These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.
| Ecosystem and package | Affected range | First fixed version | Evidence |
|---|---|---|---|
| RubyGemsjson | ECOSYSTEM: introduced 2.18.0; fixed 2.19.2 | 2.19.2 | OSV record ↗aggregator derived · 10 Sep 2026 |
| RubyGemsjson | ECOSYSTEM: introduced 2.16.0; fixed 2.17.1.2 | 2.17.1.2 | OSV record ↗aggregator derived · 10 Sep 2026 |
| RubyGemsjson | ECOSYSTEM: introduced 2.14.0; fixed 2.15.2.1 | 2.15.2.1 | OSV record ↗aggregator derived · 10 Sep 2026 |
| rubygemsjson | >= 2.18.0, < 2.19.2 | 2.19.2 | GitHub advisory ↗upstream repository advisory · 25 Mar 2026 |
| rubygemsjson | >= 2.16.0, < 2.17.1.2 | 2.17.1.2 | GitHub advisory ↗upstream repository advisory · 25 Mar 2026 |
| rubygemsjson | >= 2.14.0, < 2.15.2.1 | 2.15.2.1 | GitHub advisory ↗upstream repository advisory · 25 Mar 2026 |
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
The vendor explicitly identifies these products or versions as containing the fix.
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch availableRuby 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.
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.
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may obtain information outside the intended access boundary.
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.
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may obtain information outside the intended access boundary.
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
CWE-134: Use of Externally-Controlled Format String. The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:NCommon Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.
Operational remediation based on structured source evidence.
Published 20 Mar 2026 · Last source change 21 Aug 2026, 12:13 UTC · CWE-134 · Use of Externally-Controlled Format String
Core structured fields are present and their contributing authorities are shown above.