What is CVE-2026-49477?

CVE-2026-49477 is a high-severity vulnerability in Facelessuser Soupsieve, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-14.

How severe is CVE-2026-49477?

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

Resource exhaustion in Facelessuser Soupsieve

CVE-2026-49477

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selecto…

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Facelessuser Soupsieve — versions < 2.8.4

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-49477?: CVE-2026-49477 is a high-severity vulnerability in Facelessuser Soupsieve, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-14.
How severe is CVE-2026-49477?: High severity. CVSS v3 base score is 7.5 out of 10.