CVE-2026-57235CWE-125CWE-190

Nokogiri: Possible Out-of-Bounds Read in `Nokogiri::XML::NodeSet#[]`

Medium · published June 25, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
35.9
In the wild
Unconfirmed
What it is

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::NodeSet#[] (and its alias #slice) checked the requested index against the node set's bounds using a 32-bit-truncated copy of the index. A large negative index could pass the check and then be used at full width, reading outside the node set's storage. On CRuby this is an out-of-bounds read that typically crashes the process; on JRuby it is not memory-unsafe but returns an incorrect node. This vulnerability is fixed in 1.19.4.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00426 · 35.9th percentile
Weaknesses
CWE-125 · Out-of-bounds Read; CWE-190 · Integer Overflow or Wraparound
Published
2026-06-25T14:31Z
EPSS history
Timeline
  • 25 JUN 14:31Z
    Nokogiri: Possible Out-of-Bounds Read in `Nokogiri::XML::NodeSet#[]`
    cvelistv5