Skip to content
Noroxi
CVE-2013-0333· NVD / CVE Program· CNA redhat

lib/active_support/json/backends/yaml.rb in Ruby on Rails 2.3.x before 2.3.16 and 3.0.x before 3.0.20 does not properly convert JSON data to

Noroxi assessment

Priority: Plan (action score 59/100)

  • A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
  • Public proof-of-concept code exists (Exploit-DB, GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 95.5% (FIRST EPSS); higher than 99.8% of all records.
  • No special conditions are required; it is repeatable.
  • Fixed version: rails (Debian:12) 2.3.14.1; rails (Debian:6.0) 2.3.5-1.2+squeeze6; rubygem-activesupport (Red Hat:openshift:1::el6) 1:3.0.13-4.el6op.

Add it to your regular patch cycle. Upgrade to rails (Debian:12) 2.3.14.1; rails (Debian:6.0) 2.3.5-1.2+squeeze6; rubygem-activesupport (Red Hat:openshift:1::el6) 1:3.0.13-4.el6op or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

lib/active_support/json/backends/yaml.rb in Ruby on Rails 2.3.x before 2.3.16 and 3.0.x before 3.0.20 does not properly convert JSON data to YAML data for processing by a YAML parser, which allows remote attackers to execute arbitrary code, conduct SQL injection attacks, or bypass authentication via crafted data that triggers unsafe decoding, a different vulnerability than CVE-2013-0156.

HighCVSS 7.5 · v2.0—Weaponized Fix available
Published
Jan 30, 2013
Updated
Jun 16, 2026
EPSS
95.5% · 99th percentile
CWE
—

Report tools

JSON

Action score

59

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
29 / 30 · 95.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2013-0333

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for rubyonrails records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
rubyonrailsrails
rubyonrailsruby on rails

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • rubyonrails rails2.3.0
  • rubyonrails rails2.3.1
  • rubyonrails rails2.3.10
  • rubyonrails rails2.3.11
  • rubyonrails rails2.3.12
  • rubyonrails rails2.3.13
  • rubyonrails rails2.3.14
  • rubyonrails rails2.3.15
  • rubyonrails rails2.3.2
  • rubyonrails rails2.3.3
  • rubyonrails rails2.3.4
  • rubyonrails rails2.3.9
  • rubyonrails rails3.0.0
  • rubyonrails rails3.0.1
  • rubyonrails rails3.0.10
  • rubyonrails rails3.0.11
  • rubyonrails rails3.0.12
  • rubyonrails rails3.0.13
  • rubyonrails rails3.0.14
  • rubyonrails rails3.0.16

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12railsbefore 2.3.14.12.3.14.1
Debian:6.0railsbefore 2.3.5-1.2+squeeze62.3.5-1.2+squeeze6
Red Hat:openshift:1::el6rubygem-activesupportbefore 1:3.0.13-4.el6op1:3.0.13-4.el6op
RubyGemsactivesupportfrom 2.3.2 · before 2.3.162.3.16
RubyGemsactivesupportfrom 3.0.0 · before 3.0.203.0.20

Same product

rubyonrails: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-5418There is a File Content Disclosure vulnerability in Action View <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3 where specially crafted accepKEV
    90Now
  • CVE-2016-0752Directory traversal vulnerability in Action View in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, anKEV
    89Now
  • CVE-2019-5420A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically gene
    66This week

Published before and after this one in the same product

  • ← EarlierCVE-2013-0155Jan 13, 2013 · Ruby on Rails 3.0.x before 3.0.19, 3.1.x before 3.1.10, and 3.2.x before 3.2.11 does not properly consider differences in parameter handling
    27Monitor
  • ← EarlierCVE-2013-0156Jan 13, 2013 · active_support/core_ext/hash/conversions.rb in Ruby on Rails before 2.3.15, 3.0.x before 3.0.19, 3.1.x before 3.1.10, and 3.2.x before 3.2.1
    60This week
  • Later →CVE-2013-0276Feb 12, 2013 · ActiveRecord in Ruby on Rails before 2.3.17, 3.1.x before 3.1.11, and 3.2.x before 3.2.12 allows remote attackers to bypass the attr_protect
    18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:rails2.3.14.1 · Debian:12Package registry (OSV)
red hat:rubygem-activesupport1:3.0.13-4.el6op · Red Hat:openshift:1::el6Package registry (OSV)
RubyGems:activesupport2.3.16Package registry (OSV)
RubyGems:activesupport3.0.20Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×2
  • Exploit-DB entry ×1
  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entryremote2013-01-29
Metasploit moduleauxiliary/scanner/http/rails_json_yaml_scannerRuby on Rails JSON Processor YAML Deserialization Scannerauxiliary—
Metasploit moduleexploit/multi/http/rails_json_yaml_code_execRuby on Rails JSON Processor YAML Deserialization Code Executionexploit2013-01-28
Proof-of-concept repository on GitHubstars:22013-01-29

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-2 d
  2. First PoC-1 d
  3. Published
  4. TodayOct 21, 2026+5012 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
P · data can be read
Integrity
P · data or configuration can be modified
Availability
P · the service can be disrupted
Attack complexity
Low
Confidentiality impact
P
Integrity impact
P
Availability impact
P

Weakness class (CWE)

—

CVSS vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records