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CVE-2026-49477

7.5 · HIGH

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4.

Published Jul 14, 2026CWE-400EPSS 0.64%

Overview

CVE-2026-49477 is a high-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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 selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/facelessuser/soupsieve/commit/eb4397618709186c109400448c6043b728217dc3GitHubgithub.com/facelessuser/soupsieve/releases/tag/2.8.4GitHubgithub.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37GitHubgithub.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37

How CyberStrike helps

Frequently asked questions

What is CVE-2026-49477?

CVE-2026-49477 is a high-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-49477?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-49477?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-49477?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-49477 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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