What is CVE-2017-11554?

CVE-2017-11554 is a high-severity vulnerability in Libsass, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2017-07-23.

How severe is CVE-2017-11554?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Libsass

CVE-2017-11554

There is a stack consumption vulnerability in the lex function in parser.hpp (as used in sassc) in LibSass 3.4.5. A crafted input will lead to a remote denial of service.

Published 2017-07-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Libsass — versions 3.4.5

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

github.com/sass/libsass/issues/2445 (Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2017-11554?: CVE-2017-11554 is a high-severity vulnerability in Libsass, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2017-07-23.
How severe is CVE-2017-11554?: High severity. CVSS v3 base score is 7.5 out of 10.