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Fencer Intel
critical 9.8

CVE-2017-11465 json

The parser_yyerror function in the UTF-8 parser in Ruby 2.4.1 allows attackers to cause a denial of service (invalid write or read) or poss…

published 2017-07-19 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-3086

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

The parser_yyerror function in the UTF-8 parser in Ruby 2.4.1 allows attackers to cause a denial of service (invalid write or read) or possibly have unspecified other impact via a crafted Ruby script, related to the parser_tokadd_utf8 function in parse.y. NOTE: this might have security relevance as a bypass of a $SAFE protection mechanism.

Patch / fix

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-11465 updated cvss 5.9

ruby: Invalid read/write in parser_yyerror function in UTF-8 parser

  • Red Hat Software Collections rh-ruby24-ruby, rh-ruby24-ruby-irb, rh-ruby24-rubygems, rh-ruby24-ruby-libs, rh-ruby24-rubygem-json, rh-ruby24-rubygem-rake, +11 more
    affected: no fix planned “Will not fix”
  • Red Hat CloudForms Management Engine 5 ruby-200-ruby, rh-ruby22-ruby Red Hat Enterprise Linux 5 ruby Red Hat Enterprise Linux 6 ruby, ruby-ri, ruby-irb, ruby-libs, ruby-rdoc, ruby-tcltk Red Hat Enterprise Linux 7 ruby, ruby-irb, rubygems, ruby-libs, ruby-tcltk, rubygem-json, +6 more Red Hat Software Collections rh-ruby22-ruby, rh-ruby23-ruby, rh-ruby22-ruby-irb, rh-ruby22-rubygems, rh-ruby23-ruby-irb, rh-ruby23-rubygems, +24 more Red Hat Subscription Asset Manager ruby193-ruby
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.68% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.