CVE-2026-97689

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Source
https://cve.org/CVERecord?id=CVE-2026-97689
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97689.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-97689
Aliases
Downstream
AZL (2)
BELL (1)
CGA (369)
CLEANSTART (4)
CLSA (5)
DEBIAN (1)
ECHO (1)
MINI (34)
openSUSE (3)
RHSA (3)
RLSA (2)
ROOT (1)
SUSE (4)
UBUNTU (1)
Related
ALSA (2)
openSUSE (3)
SUSE (4)
Published
2026-09-29T15:36:05Z
Modified
2026-10-20T12:02:41Z
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
Fixed
cd770b059b543be29298ea5c52afb0b1b090f5ed
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "1.10.3"
                },
                {
                    "fixed":  "2.8.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "cd770b059b543be29298ea5c52afb0b1b090f5ed"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "2.8.0",
            "range":  [
                {
                    "fixed":  "b1d30ab61fe0db8f11092805e8c5ac43e091064a"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Database specific

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