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01 Record

CVE-2025-13836

Excessive read buffering DoS in http.client

MediumPUBLISHEDCNA: PSF
CNA base score6.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
View raw JSON

02 Description

Excessive read buffering DoS in http.client

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.63% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 76.0% of scored records. A rank, not a probability.
NVD base score
6.3 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Analyzed. NVD last modified this record on 2026-09-03.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2025-12-01 18:02Z11 MO AGO
Last updated
2026-03-03 14:41Z8 MO AGO
Reserved
2025-12-01
Assigning CNA
PSF
Record state
PUBLISHED
Severity
Medium (CVSS 6.3)
CNA CVSS vector
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
Weaknesses
  • CWE-400Uncontrolled Resource ConsumptionClass
  • CWE-770Allocation of Resources Without Limits or ThrottlingBase
Data version
5.2
Document digest
1bc5e04b263e31fce7fcb0515c693a4b9dfa265b125d270411f7dae15aec6825

05 Affected products

VendorProductVersionsPlatforms
Python Software FoundationCPython0 to < 3.10.20, 3.11.0 to < 3.11.15, 3.12.0 to < 3.12.13, 3.13.0 to < 3.13.11, 3.14.0 to < 3.14.1, 3.15.0a1 to < 3.15.0a3—

06 References

07 Fixed in

AlmaLinux 8

  • python3.11
    Fixed in 3.11.13-4.el8_10
  • python3.11-debug
    Fixed in 3.11.13-4.el8_10
  • python3.11-devel
    Fixed in 3.11.13-4.el8_10
  • python3.11-idle
    Fixed in 3.11.13-4.el8_10
  • python3.11-libs
    Fixed in 3.11.13-4.el8_10
  • python3.11-rpm-macros
    Fixed in 3.11.13-4.el8_10
  • python3.11-test
    Fixed in 3.11.13-4.el8_10
  • python3.11-tkinter
    Fixed in 3.11.13-4.el8_10
  • python3.12
    Fixed in 3.12.12-2.el8_10
  • python3.12-debug
    Fixed in 3.12.12-2.el8_10
  • python3.12-devel
    Fixed in 3.12.12-2.el8_10
  • python3.12-idle
    Fixed in 3.12.12-2.el8_10
  • python3.12-libs
    Fixed in 3.12.12-2.el8_10
  • python3.12-rpm-macros
    Fixed in 3.12.12-2.el8_10
  • python3.12-test
    Fixed in 3.12.12-2.el8_10
  • python3.12-tkinter
    Fixed in 3.12.12-2.el8_10

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • python3.11
    Fixed in 3.11.13-5.el9_7
  • python3.11-debug
    Fixed in 3.11.13-5.el9_7
  • python3.11-devel
    Fixed in 3.11.13-5.el9_7
  • python3.11-idle
    Fixed in 3.11.13-5.el9_7
  • python3.11-libs
    Fixed in 3.11.13-5.el9_7
  • python3.11-test
    Fixed in 3.11.13-5.el9_7
  • python3.11-tkinter
    Fixed in 3.11.13-5.el9_7
  • python3.12
    Fixed in 3.12.12-4.el9_7
  • python3.12-debug
    Fixed in 3.12.12-4.el9_7
  • python3.12-devel
    Fixed in 3.12.12-4.el9_7
  • python3.12-idle
    Fixed in 3.12.12-4.el9_7
  • python3.12-libs
    Fixed in 3.12.12-4.el9_7
  • python3.12-test
    Fixed in 3.12.12-4.el9_7
  • python3.12-tkinter
    Fixed in 3.12.12-4.el9_7

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • python-unversioned-command
    Fixed in 3.12.12-3.el10_1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • python3.11
    Fixed in 3.11.13-4.el8_10
  • python3.11-debug
    Fixed in 3.11.13-4.el8_10
  • python3.11-devel
    Fixed in 3.11.13-4.el8_10
  • python3.11-idle
    Fixed in 3.11.13-4.el8_10
  • python3.11-libs
    Fixed in 3.11.13-4.el8_10
  • python3.11-rpm-macros
    Fixed in 3.11.13-4.el8_10
  • python3.11-test
    Fixed in 3.11.13-4.el8_10
  • python3.11-tkinter
    Fixed in 3.11.13-4.el8_10
  • python3.12
    Fixed in 3.12.12-2.el8_10
  • python3.12-debug
    Fixed in 3.12.12-2.el8_10
  • python3.12-devel
    Fixed in 3.12.12-2.el8_10
  • python3.12-idle
    Fixed in 3.12.12-2.el8_10
  • python3.12-libs
    Fixed in 3.12.12-2.el8_10
  • python3.12-rpm-macros
    Fixed in 3.12.12-2.el8_10
  • python3.12-test
    Fixed in 3.12.12-2.el8_10
  • python3.12-tkinter
    Fixed in 3.12.12-2.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • python3.11
    Fixed in 3.11.13-5.el9_7
  • python3.11-debug
    Fixed in 3.11.13-5.el9_7
  • python3.11-devel
    Fixed in 3.11.13-5.el9_7
  • python3.11-idle
    Fixed in 3.11.13-5.el9_7
  • python3.11-libs
    Fixed in 3.11.13-5.el9_7
  • python3.11-test
    Fixed in 3.11.13-5.el9_7
  • python3.11-tkinter
    Fixed in 3.11.13-5.el9_7
  • python3.12
    Fixed in 3.12.12-4.el9_7
  • python3.12-debug
    Fixed in 3.12.12-4.el9_7
  • python3.12-devel
    Fixed in 3.12.12-4.el9_7
  • python3.12-idle
    Fixed in 3.12.12-4.el9_7
  • python3.12-libs
    Fixed in 3.12.12-4.el9_7
  • python3.12-test
    Fixed in 3.12.12-4.el9_7
  • python3.12-tkinter
    Fixed in 3.12.12-4.el9_7

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • python-unversioned-command
    Fixed in 3.12.12-3.el10_1

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • pypy3
    No fix yet
  • python3.11
    Fixed in 3.11.2-6+deb12u7

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • pypy3
    No fix yet
  • python3.13
    Fixed in 3.13.5-2+deb13u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • pypy3
    Fixed in 7.3.21+dfsg-1
  • python3.13
    Fixed in 3.13.11-1
  • python3.14
    Fixed in 3.14.2-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • python3.10
    Fixed in 3.10.12-1~22.04.13

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • python3.12
    Fixed in 3.12.3-1ubuntu0.10

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • python3.13
    Fixed in 3.13.7-1ubuntu0.2
  • python3.14
    Fixed in 3.14.0-1ubuntu0.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • python3.8
    Fixed in 3.8.0-3ubuntu1~18.04.2+esm8
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • python3.8
    Fixed in 3.8.10-0ubuntu1~20.04.18+esm4
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • python3.9
    Fixed in 3.9.5-3ubuntu0~20.04.1+esm8
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • python3.11
    Fixed in 3.11.0~rc1-1~22.04.1~esm7
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.