CVE-2026-97689

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Source
https://cve.org/CVERecord?id=CVE-2026-97689
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97689.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-97689
Aliases
Downstream
Published
2026-09-29T15:36:05Z
Modified
2026-09-30T03:50:16Z
Severity
  • 8.9 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H CVSS Calculator
Summary
urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory
Details

urllib3 is an HTTP client library for Python. From 1.10.3 until 2.8.0, the HTTPResponse.read_chunked and HTTPResponse.stream methods can allocate unbounded memory because the streaming chunk parser buffers the chunk-size field until newline or EOF without a length bound. The trigger is that a malicious server returns Transfer-Encoding: chunked followed by a very long run of bytes without a newline. The attack mechanism is that a malicious HTTP server sends a very long unterminated chunk-size line. The impact is that unbounded memory allocation can exhaust the client process. This issue is fixed in version 2.8.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97689.json"
}
References

Affected packages

Git / github.com/urllib3/urllib3

Affected ranges

Type
GIT
Repo
https://github.com/urllib3/urllib3
Events
Introduced
0b744993bbe30fe6e3e4e0c93416412d8e598301
Fixed
b1d30ab61fe0db8f11092805e8c5ac43e091064a
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "1.10.3"
        },
        {
            "fixed": "2.8.0"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-97689.json"