CVE-2025-13836

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2025-13836
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-13836.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-13836
Aliases
Downstream
AZL (2)
BELL (1)
CGA (10)
CLSA (3)
DEBIAN (1)
ECHO (1)
MGASA (1)
MINI (5)
OESA (6)
openSUSE (10)
RHSA (16)
RLSA (5)
ROOT (2)
SUSE (37)
UBUNTU (1)
Related
ALSA (5)
openSUSE (10)
SUSE (37)
Published
2025-12-01T18:02:38Z
Modified
2026-10-21T02:31:05Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L CVSS Calculator
Summary
Excessive read buffering DoS in http.client
Details

When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.

Database specific 
{
    "cna_assigner":  "PSF",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/13xxx/CVE-2025-13836.json"
}
References

Affected packages

Git / github.com/python/cpython

Affected ranges

Type
GIT
Repo
https://github.com/python/cpython
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
842e987df856a5d4db37933c62a3456930a19092
Introduced
deaf509e8fc6e0363bd6f26d52ad42f976ec42f2
Fixed
2340a037f7450e70fccfe411e6531afb4d57a312
Introduced
0fb18b02c8ad56299d6a2910be0bab8ad601ef24
Fixed
3bb231a6a5dc02b95658877318bf61501a7209e9
Introduced
60403a5409ff2c3f3b07dd2ca91a7a3e096839c7
Fixed
627894459a84be3488a1789919679c997056a03c
Introduced
ebf955df7a89ed0c7968f79faec1de49f61ed7cb
Fixed
14b1fdb0a94b96f86fc7b86671ea9582b8676628
Fixed
289f29b0fe38baf2d7cb5854f4bb573cc34a6a15
Fixed
4ce27904b597c77d74dd93f2c912676021a99155
Fixed
5a4c4a033a4a54481be6870aa1896fad732555b5
Fixed
5dc101675fd22918facbbe0fecdc821502beaaf0
Fixed
afc40bdd3dd71f343fd9016f6d8eebbacbd6587c
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "3.10.20"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.11.0"
                },
                {
                    "fixed":  "3.11.15"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.12.0"
                },
                {
                    "fixed":  "3.12.13"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.13.0"
                },
                {
                    "fixed":  "3.13.11"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:python:python:3.14.0:-:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "3.14.0-NA"
                },
                {
                    "last_affected":  "3.14.0-NA"
                }
            ],
            "source":  "CPE_STRING"
        },
        {
            "range":  [
                {
                    "fixed":  "14b1fdb0a94b96f86fc7b86671ea9582b8676628"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "289f29b0fe38baf2d7cb5854f4bb573cc34a6a15"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "4ce27904b597c77d74dd93f2c912676021a99155"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "5a4c4a033a4a54481be6870aa1896fad732555b5"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "5dc101675fd22918facbbe0fecdc821502beaaf0"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "afc40bdd3dd71f343fd9016f6d8eebbacbd6587c"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

3.*
3.14.0-NA
v0.*
v0.9.8
v0.9.9
v1.*
v1.0.1
v1.0.2
v1.1
v1.1.1
v1.2
v1.2b1
v1.2b2
v1.2b3
v1.2b4
v1.3
v1.3b1
v1.4
v1.4b1
v1.4b2
v1.4b3
v1.5
v1.5.1
v1.5.2
v1.5.2a1
v1.5.2a2
v1.5.2b1
v1.5.2b2
v1.5.2c1
v1.5a1
v1.5a2
v1.5a3
v1.5a4
v1.5b1
v1.5b2
v1.6a1
v1.6a2
v2.*
v2.0
v2.0b1
v2.0b2
v2.0c1
v2.1
v2.1a1
v2.1a2
v2.1b1
v2.1b2
v2.1c1
v2.1c2
v2.2a3
v2.3c1
v2.3c2
v2.4
v2.4a1
v2.4a2
v2.4a3
v2.4b1
v2.4b2
v2.4c1
v3.*
v3.0a1
v3.0a2
v3.0a3
v3.0a4
v3.0a5
v3.0b1
v3.0b2
v3.0b3
v3.0rc1
v3.0rc2
v3.0rc3
v3.1
v3.10.0a1
v3.10.0a7
v3.10.0b1
v3.10.0b2
v3.10.0b3
v3.10.0b4
v3.10.0rc1
v3.10.0rc2
v3.10.1
v3.10.10
v3.10.11
v3.10.12
v3.10.13
v3.10.14
v3.10.15
v3.10.16
v3.10.17
v3.10.18
v3.10.19
v3.10.2
v3.10.3
v3.10.4
v3.10.5
v3.10.6
v3.10.7
v3.10.8
v3.10.9
v3.11.0a3
v3.11.0a4
v3.11.0a5
v3.11.0a6
v3.11.0a7
v3.11.0b1
v3.11.0b2
v3.11.0b3
v3.11.0b4
v3.11.0b5
v3.11.0rc1
v3.11.0rc2
v3.11.1
v3.11.10
v3.11.11
v3.11.12
v3.11.13
v3.11.14
v3.11.2
v3.11.3
v3.11.4
v3.11.5
v3.11.6
v3.11.7
v3.11.8
v3.11.9
v3.12.0
v3.12.0a1
v3.12.0a2
v3.12.0a3
v3.12.0a4
v3.12.0a5
v3.12.0a6
v3.12.0a7
v3.12.0b1
v3.12.1
v3.12.10
v3.12.11
v3.12.12
v3.12.2
v3.12.3
v3.12.4
v3.12.5
v3.12.6
v3.12.7
v3.12.8
v3.12.9
v3.13.0
v3.13.0a1
v3.13.0a2
v3.13.0a3
v3.13.0a4
v3.13.0a5
v3.13.0a6
v3.13.0b1
v3.13.1
v3.13.10
v3.13.2
v3.13.3
v3.13.4
v3.13.5
v3.13.6
v3.13.7
v3.13.8
v3.14.0
v3.14.0a1
v3.14.0a2
v3.14.0a3
v3.14.0a4
v3.14.0a5
v3.14.0a6
v3.14.0a7
v3.14.0b1
v3.15.0a1
v3.15.0a2
v3.1a1
v3.1a2
v3.1b1
v3.1rc1
v3.1rc2
v3.2a1
v3.2a2
v3.2a3
v3.2a4
v3.2b1
v3.2b2
v3.2rc1
v3.2rc2
v3.2rc3
v3.3.0a2
v3.3.0a3
v3.3.0a4
v3.3.0b1
v3.3.0b2
v3.3.0rc1
v3.3.0rc2
v3.3.0rc3
v3.4.0a1
v3.4.0a2
v3.4.0a3
v3.4.0a4
v3.4.0b1
v3.4.0b2
v3.4.0b3
v3.5.0a1
v3.5.0a2
v3.5.0a3
v3.5.0a4
v3.5.0b1
v3.6.0a3
v3.6.0b1
v3.7.0a2
v3.9.0a2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-13836.json"