Description
Stack overflow vulnerability in ast_selectors.cpp in function Sass::CompoundSelector::has_real_parent_ref in libsass:3.6.5-8-g210218, which can be exploited by attackers to causea denial of service (DoS). Also affects the command line driver for libsass, sassc 3.6.2.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libsass | 3.6.5+20231221-2 | — |
| Debian 13 | libsass | 3.6.5+20231221-2 | — |
| Debian 12 | libsass | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | libsass | No fix yet | — |
| Ubuntu 20.04 LTS | libsass | No fix yet | — |
| Ubuntu 16.04 LTS | libsass | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libsass | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | libsass | 3.6.5-150200.4.10.1 | SUSE-SU-2023:4895-1 |
| SLES 15 SP4 | libsass | 3.6.5-150200.4.10.1 | SUSE-SU-2023:4895-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libsass | 3.6.5-2.1 | openSUSE-SU-2024:13516-1 |
| openSUSE Leap 15.5 | libsass | 3.6.5-150200.4.10.1 | SUSE-SU-2023:4895-1 |
| openSUSE Leap 15.4 | libsass | 3.6.5-150200.4.10.1 | SUSE-SU-2023:4895-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libsass | 3.6.6-r0 | — |
| Alpine v3.23 | libsass | 3.6.6-r0 | — |
| Alpine v3.22 | libsass | 3.6.6-r0 | — |
| Alpine v3.21 | libsass | 3.6.6-r0 | — |
| Alpine v3.20 | libsass | 3.6.6-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libsass | 3.6.6-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libsass | 3.6.6-1 | — |
| Azure Linux 2 (CBL-Mariner) | libsass | No fix yet | — |
Advisories 2
- openSUSE-SU-2024:13516-1 libsass-3_6_5-1-3.6.5-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4895-1 Security update for libsass SUSE / openSUSE Security Updates · Feb 4, 2026