CVE-2019-5477
A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Ruby's `Kernel.open` method.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.90%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Ruby's `Kernel.open` method. Processes are vulnerable only if the undocumented method `Nokogiri::CSS::Tokenizer#load_file` is being called with unsafe user input as the filename. This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.90% probability · 93th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- nokogiri/nokogiri · canonical/ubuntu linux · debian/debian linux
- Source
- support@hackerone.com
EPSS 5.9% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/sparklemotion/nokogiri/issues/1915Patch, Third Party Advisory
- https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdocRelease Notes
- https://hackerone.com/reports/650835Permissions Required
- https://lists.debian.org/debian-lts-announce/2019/09/msg00027.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00018.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00019.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202006-05Third Party Advisory
- https://usn.ubuntu.com/4175-1/Third Party Advisory
- https://github.com/sparklemotion/nokogiri/issues/1915Patch, Third Party Advisory
- https://github.com/tenderlove/rexical/blob/master/CHANGELOG.rdocRelease Notes
- https://hackerone.com/reports/650835Permissions Required
- https://lists.debian.org/debian-lts-announce/2019/09/msg00027.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00018.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00019.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202006-05Third Party Advisory
- https://usn.ubuntu.com/4175-1/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.