CVE-2026-49477

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Source
https://cve.org/CVERecord?id=CVE-2026-49477
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49477.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49477
Aliases
Downstream
Related
Published
2026-07-14T20:51:29.369Z
Modified
2026-07-17T03:41:42.609621085Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Soup Sieve: Regular Expression Denial of Service (ReDoS) in soupsieve Selector Parser
Details

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

Database specific 
{
    "cwe_ids": [
        "CWE-1333",
        "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49477.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/facelessuser/soupsieve

Affected ranges

Type
GIT
Repo
https://github.com/facelessuser/soupsieve
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
eb4397618709186c109400448c6043b728217dc3
Fixed
28108ab805818c832d9568142a99844fd95a0d39
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.8.4"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.4.0
0.5.0
0.5.1
0.5.2
0.5.3
0.6.0
1.*
1.0.0
1.0.0b1
1.0.0b2
1.0.1
1.0.2
1.1.0
1.2.0
1.2.1
1.3.0
1.3.1
1.4.0
1.5.0
1.6.0
1.6.1
1.7.0
1.7.1
1.7.2
1.7.3
1.8.0
1.9.0
1.9.1
1.9.2
1.9.3
1.9.4
2.*
2.0.0
2.0.1
2.1.0
2.2
2.2.1
2.3
2.3.1
2.3.2
2.3.2.post1
2.4
2.4.1
2.5
2.6
2.7
2.8
2.8.1
2.8.2
2.8.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49477.json"