VulnerabilityAnalyzed
CVE-2025-13836
This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.
MEDIUM 6.3EPSS 1.63%
Does this matter?
Lower severity and a low EPSS score (1.63%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 4.0
- 6.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 1.63% probability · 75th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- python/python
- Source
- cna@python.org
References
- https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628Patch
- https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15Patch
- https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155Patch
- https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5Patch
- https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0Patch
- https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587cPatch
- https://github.com/python/cpython/issues/119451Issue Tracking, Patch
- https://github.com/python/cpython/pull/119454Issue Tracking, Patch
- https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.