CVE catalog
CVE-2026-57236
Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a nu
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.43% · Oct 25, 2026
Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a null byte) raises an exception, but only after freeing the document's current encoding string without replacing it. The document is left referencing freed memory, so the next call to Document#encoding reads invalid memory, which can cause a segfault or leak freed bytes into a Ruby String. Affects the CRuby (libxml2) implementation only; JRuby is not affected. This vulnerability is fixed in 1.19.4.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | ruby-nokogiri | sid | 1.19.4+dfsg-1 | fixed |
| Debian | ruby-nokogiri | forky | 1.19.4+dfsg-1 | fixed |
| Debian | ruby-nokogiri | trixie | 1.18.2+dfsg-1 | vulnerable |
| Debian | ruby-nokogiri | bookworm | 1.13.10+dfsg-2 | vulnerable |
| Cpe | ruby-nokogiri | Not reported | Not reported | vulnerable |
| Cpe | nokogiri | Not reported | 1.19.4 | fixed |
| Cpe | nokogiri | Not reported | 1.19.4 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | ruby-nokogiri | source | sid | 1.19.4+dfsg-1 | not yet assigned | Not reported | [1140769] |
| Debian | ruby-nokogiri | source | forky | 1.19.4+dfsg-1 | not yet assigned | Not reported | [1140769] |
| Debian | ruby-nokogiri | source | trixie | (unfixed) | not yet assigned | Not reported | [1140769] |
| Debian | ruby-nokogiri | source | bookworm | (unfixed) | not yet assigned | Not reported | [1140769] |
| Cpe | nokogiri | cpe | Not reported | 1.19.4 | Not reported | Not reported | Not reported |
| Cpe | nokogiri | cpe | Not reported | 1.19.4 | Not reported | NVD-CVE-2026-57236 | Not reported |
Notes
[trixie] ruby-nokogiri: Minor issue [bookworm] ruby-nokogiri: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [ruby-nokogiri]Affected
Source package: [ruby-nokogiri]
Details (2)
1.13.10+dfsg-2+b1· amd64 · bookwormAffected
nvd · ruby-nokogiri · debian · bookworm; nvd · ruby-nokogiri · debian · 12
1.13.10+dfsg-2+b1· arm64 · bookwormAffected
nvd · ruby-nokogiri · debian · bookworm; nvd · ruby-nokogiri · debian · 12
[Debian 13 (Trixie)]
- [ruby-nokogiri]Affected
Source package: [ruby-nokogiri]
Details (2)
1.18.2+dfsg-1+b1· amd64 · trixieAffected
nvd · ruby-nokogiri · debian · 13
1.18.2+dfsg-1+b1· arm64 · trixieAffected
nvd · ruby-nokogiri · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-5v8h-3h3q-446p]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-57236]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-57236]
- [https://security-tracker.debian.org/tracker/CVE-2026-57236]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57236.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]