Description
The cr_parser_parse_selector_core function in cr-parser.c in libcroco 0.6.12 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a crafted CSS file.
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.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libcroco | 0.6.13-1ubuntu0.1 | USN-6958-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libcroco | 0.6.12-2ubuntu0.1~esm1 | USN-6958-1 |
| Ubuntu Pro 16.04 LTS | libcroco | 0.6.11-1ubuntu0.1~esm1 | USN-5389-1 |
| Ubuntu Pro 14.04 LTS | libcroco | 0.6.8-2ubuntu1+esm1 | USN-6958-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | libcroco | 0.6.12-4.3.51 | SUSE-SU-2020:1535-1 |
| SLES 12 SP4 | libcroco | 0.6.11-12.3.1 | SUSE-SU-2019:1468-1 |
| SLES 12 SP3 | libcroco | 0.6.11-12.3.1 | SUSE-SU-2019:1468-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | libcroco | 0.6.11-12.3.1 | SUSE-SU-2019:1468-1 |
| SLES for SAP 12 SP3 | libcroco | 0.6.11-12.3.1 | SUSE-SU-2019:1468-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | libcroco | 0.6.12-lp151.4.3.1 | openSUSE-SU-2020:0780-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.11 | libcroco | 0.6.13-r1 | — |
| Alpine v3.10 | libcroco | 0.6.13-r1 | — |
| Alpine v3.9 | libcroco | 0.6.12-r2 | — |
| Alpine v3.8 | libcroco | 0.6.12-r2 | — |
| Alpine v3.7 | libcroco | 0.6.12-r1 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libcroco | No fix yet | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- libcroco 0.6.12 - Denial of Service EDB-42147 · dos · Jun 9, 2017
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 5
- USN-6958-1 libcroco vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5389-1 libcroco vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- SUSE-SU-2019:1468-1 Security update for libcroco SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0780-1 Security update for libcroco SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1535-1 Security update for libcroco SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://bugzilla.gnome.org/show_bug.cgi?id=782649
- 42147 exploit
- openSUSE-SU-2019:1575 vendor-advisory
- [oss-security] 20200813 Re: Re: [FD] libcroco multiple vulnerabilities mailing-list