DEBIAN-CVE-2026-71847

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Source
https://security-tracker.debian.org/tracker/CVE-2026-71847
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-71847.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-71847
Upstream
Published
2026-08-07T19:18:53Z
Modified
2026-09-19T23:00:28Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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 CVSS Calculator
Summary
[none]
Details

Ruby JSON is a JSON implementation for Ruby. From 2.20.0 until 2.21.2, Ruby's JSON native C extension clears the consumed JSON::ResumableParser input buffer but leaves state.start, state.cursor, and state.end pointing into released storage. When partial_value reconstructs an incomplete object containing duplicate keys, the duplicate-key warning path calls cursor_position, which dereferences those stale pointers. This results in a heap-use-after-free and can terminate the Ruby process. An attacker who can supply JSON stream data to an application using JSON::ResumableParser may cause process termination when the application calls partial_value on incomplete attacker-controlled input containing duplicate object keys. This issue has been fixed in version 2.21.2.

References

Affected packages

Debian:12 / ruby-json

Package

Name
ruby-json
Purl
pkg:deb/debian/ruby-json?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6.3+dfsg-1
2.7.2+dfsg-1
2.7.6+dfsg-1
2.9.1+dfsg-1
2.15.2+dfsg-1
2.18.1+dfsg-1
2.19.1+dfsg-1
2.19.2+dfsg-1
2.19.4+dfsg-1
2.19.9+dfsg-1
2.21.1+dfsg-1
2.21.2+dfsg-1
3.*
3.0.2+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-71847.json"

Debian:13 / ruby-json

Package

Name
ruby-json
Purl
pkg:deb/debian/ruby-json?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.1+dfsg-1
2.15.2+dfsg-1
2.18.1+dfsg-1
2.19.1+dfsg-1
2.19.2+dfsg-1
2.19.4+dfsg-1
2.19.9+dfsg-1
2.21.1+dfsg-1
2.21.2+dfsg-1
3.*
3.0.2+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-71847.json"

Debian:14 / ruby-json

Package

Name
ruby-json
Purl
pkg:deb/debian/ruby-json?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.21.2+dfsg-1

Affected versions

2.*
2.9.1+dfsg-1
2.15.2+dfsg-1
2.18.1+dfsg-1
2.19.1+dfsg-1
2.19.2+dfsg-1
2.19.4+dfsg-1
2.19.9+dfsg-1
2.21.1+dfsg-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-71847.json"