| Name | CVE-2018-20821 |
| Description | The parsing component in LibSass through 3.5.5 allows attackers to cause a denial-of-service (uncontrolled recursion in Sass::Parser::parse_css_variable_value in parser.cpp). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libsass (PTS) | stretch | 3.4.3-1 | fixed |
| buster | 3.5.5-4 | vulnerable |
| bullseye | 3.6.4+20201122-1 | fixed |
| bookworm | 3.6.5+20220909-1 | fixed |
| sid, trixie | 3.6.5+20231221-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libsass | source | stretch | (not affected) | | | |
| libsass | source | (unstable) | 3.6.3-1 | low | | |
Notes
[buster] - libsass <no-dsa> (Minor issue)
[stretch] - libsass <not-affected> (Vulnerable code introduced later)
https://github.com/sass/libsass/issues/2658
Introduced by: https://github.com/sass/libsass/commit/efd97dae376de50b3e6ed724337c4f274a21491d (3.5.0)
Fixed by: https://github.com/sass/libsass/commit/f2db04883e5fff4e03777dcc1eb60d4373c45be1