VDB
CVE-2026-49477
CVE-2026-49477
PUBLISHED
CVSS 7.5 HIGH
Reported by GitHub_M · Published July 14, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| facelessuser | soupsieve | < 2.8.4 |
| wolfi | datadog-agent-7.74 | 0, 0, 0 |
| wolfi | datadog-agent-7.79 | 0, 0, 0 |
| chainguard | datadog-agent-fips-7.78 | 0, 0, 0 |
| wolfi | datadog-agent-7.77 | 0, 0, 0 |
| chainguard | datadog-agent-7.79 | 0, 0, 0 |
| chainguard | datadog-agent-fips-7.79 | 0, 0, 0 |
| chainguard | datadog-agent-7.77 | 0, 0, 0 |
| wolfi | datadog-agent-7.76 | 0, 0, 0 |
| wolfi | datadog-agent-7.73 | 0, 0, 0 |
| chainguard | datadog-agent-fips-7.71 | 0, 0, 0 |
| chainguard | datadog-agent-fips-7.76 | 0, 0, 0 |
| wolfi | open-webui | 0, 0, 0 |
| chainguard | datadog-agent-7.76 | 0, 0, 0 |
| chainguard | datadog-agent-fips-7.72 | 0, 0, 0 |
| chainguard | datadog-agent-fips-7.73 | 0, 0, 0 |
| chainguard | open-webui | 0, 0, 0 |
| chainguard | datadog-agent-fips-7.74 | 0, 0, 0 |
| PyPI | soupsieve | 0 |
| chainguard | datadog-agent-7.72 | 0, 0, 0 |
…and 11 more
Timeline
- Jul 9, 2026 CVE Published
- Jul 15, 2026 Security Advisory
- Aug 7, 2026 EPSS Score
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
References
- https://github.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37 x_refsource_CONFIRM
- https://github.com/facelessuser/soupsieve/commit/eb4397618709186c109400448c6043b728217dc3 x_refsource_MISC
- https://github.com/facelessuser/soupsieve/releases/tag/2.8.4 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-49477 advisory
- https://github.com/advisories/GHSA-836r-79rf-4m37 advisory