CVE-2026-86000

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Source
https://cve.org/CVERecord?id=CVE-2026-86000
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86000.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-86000
Aliases
Downstream
AZL (1)
CGA (24)
CLEANSTART (3)
DEBIAN (1)
ECHO (1)
MINI (7)
openSUSE (2)
SUSE (2)
UBUNTU (1)
Related
openSUSE (2)
SUSE (2)
Published
2026-09-17T15:21:57Z
Modified
2026-10-28T02:30:58Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Soup Sieve: Polynomial-time ReDoS (O(n²)) in the `IDENTIFIER` / `VALUE` selector sub-patterns
Details

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.9, the selector parser in src/soupsieve/css_parser.py defines IDENTIFIER with adjacent quantified groups over overlapping character classes, and VALUE embeds IDENTIFIER for attribute selectors. When an attacker-controlled selector contains a long identifier or unquoted attribute-value run followed by input that makes the overall match fail, the regular expression engine explores quadratically many splits between the overlapping groups. User-controlled selectors can reach this path through soupsieve.compile(), soupsieve.select(), or BeautifulSoup.select(), while applications using only hard-coded selectors are unaffected. The resulting CPU consumption can hold the Python GIL, exhaust application workers, and stall a service; successful plain identifier matches are linear, and the issue does not cause memory corruption or code execution. The issue is fixed in version 2.9.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-1333",
        "CWE-400"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86000.json"
}
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
8763f914472fc83652babda708bed5c8ef287004
Fixed
ce44e4996e6632871c18cdd7a7fb641be8ef34ef
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2.9"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "ce44e4996e6632871c18cdd7a7fb641be8ef34ef"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "2.9",
            "range":  [
                {
                    "fixed":  "8763f914472fc83652babda708bed5c8ef287004"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

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
2.8.4

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86000.json"