Read the docs
TI-2025-12644 Aliases CVE-2025-13836GHSA-399h-rrqc-rpgv

Excessive read buffering DoS in http.client

Priority LOW 32CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Partial Red Hat: 21 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01748 77th percentileScored 2026-11-07
Fix Partial CPython (Python Software Foundation): 3.10.20, 3.11.15, 3.12.13 +3Red Hat: 23 advisoriesRed Hat: 21 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Python Software FoundationCPythonbefore 3.10.20; 3.11.0 to before 3.11.15; 3.12.0 to before 3.12.13; 3.13.0 to before 3.13.11; 3.14.0 to before 3.14.1; 3.15.0a1 to before 3.15.0a33.10.20, 3.11.15, 3.12.13, 3.13.11, 3.14.1, 3.15.0a3Patch availableCNA
  • CPython VendorPython Software Foundation Affected before 3.10.20; 3.11.0 to before 3.11.15; 3.12.0 to before 3.12.13; 3.13.0 to before 3.13.11; 3.14.0 to before 3.14.1; 3.15.0a1 to before 3.15.0a3 Fixed in 3.10.20, 3.11.15, 3.12.13, 3.13.11, 3.14.1, 3.15.0a3 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*before 3.10.20; 3.11.0 to before 3.11.15; 3.12.0 to before 3.12.13; 3.13.0 to before 3.13.11Vulnerablepython-pillow
cpe:2.3:a:python:python:3.14.0:-:*:*:*:*:*:*3.14.0Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*3.15.0 alpha1Vulnerablepython-pillow
cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*3.15.0 alpha2Vulnerablepython-pillow
  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Versions before 3.10.20; 3.11.0 to before 3.11.15; 3.12.0 to before 3.12.13; 3.13.0 to before 3.13.11 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.14.0:-:*:*:*:*:*:* Versions 3.14.0 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:* Versions 3.15.0 alpha1 Vulnerable ·python-pillow
  • cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:* Versions 3.15.0 alpha2 Vulnerable ·python-pillow

Remediation

  • Fix · CNA CPython (Python Software Foundation) Fixed in 3.10.20, 3.11.15, 3.12.13, 3.13.11, 3.14.1, 3.15.0a3

Red Hat 23 advisories

  • RHSA-2026:16174 Released 2026-05-12 · Red Hat rating Important
    Red Hat AI Inference Server 3.3.3 (Spyre)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-spyre-rhel9
  • RHSA-2026:8824 Released 2026-04-17 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python3.12-3.12.13-3.hum1@aarch64, python3.12-3.12.13-3.hum1@src, python3.12-3.12.13-3.hum1@x86_64 +12
  • RHSA-2026:8822 Released 2026-04-17 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python3.11-3.11.15-4.hum1@aarch64, python3.11-3.11.15-4.hum1@src, python3.11-3.11.15-4.hum1@x86_64 +12
Show 20 more Red Hat advisories
  • RHSA-2026:8748 Released 2026-04-17 · Red Hat rating Important
    Red Hat AI Inference Server Model Optimization Tools 3.3.1 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/model-opt-cuda-rhel9
  • RHSA-2026:8746 Released 2026-04-17 · Red Hat rating Important
    Red Hat AI Inference Server 3.3.1 (CUDA)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-cuda-rhel9
  • RHSA-2026:8747 Released 2026-04-17 · Red Hat rating Important
    Red Hat AI Inference Server 3.3.1 (ROCm)
    • Red Hat AI Inference Server 3.3 registry.redhat.io/rhaiis/vllm-rocm-rhel9
  • RHSA-2026:7661 Released 2026-04-11 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python-unversioned-command-3.14.4-1.hum1@noarch@public-hummingbird-aarch64-rpms, python-unversioned-command-3.14.4-1.hum1@noarch@public-hummingbird-x86_64-rpms, python3-3.14.4-1.hum1@aarch64 +28
  • RHSA-2026:7443 Released 2026-04-10 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images python3.13-3.13.13-1.hum1@aarch64, python3.13-3.13.13-1.hum1@src, python3.13-3.13.13-1.hum1@x86_64 +16
  • RHSA-2026:4943 Released 2026-03-18 · Red Hat rating Important
    Red Hat Update Infrastructure 5.1 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:3900 Released 2026-03-05 · Red Hat rating Moderate
    python3.12 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) python3.12-3.12.9-1.el9_6.5, python3.12-debug-3.12.9-1.el9_6.5, python3.12-idle-3.12.9-1.el9_6.5 +2
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) python3.12-3.12.9-1.el9_6.5, python3.12-devel-3.12.9-1.el9_6.5, python3.12-libs-3.12.9-1.el9_6.5 +1
  • RHSA-2026:3897 Released 2026-03-05 · Red Hat rating Moderate
    python3.12 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) python3.12-3.12.1-4.el9_4.10, python3.12-debug-3.12.1-4.el9_4.10, python3.12-idle-3.12.1-4.el9_4.10 +2
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) python3.12-3.12.1-4.el9_4.10, python3.12-devel-3.12.1-4.el9_4.10, python3.12-libs-3.12.1-4.el9_4.10 +1
  • RHSA-2026:2563 Released 2026-02-11 · Red Hat rating Important
    Red Hat Update Infrastructure 5 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:2419 Released 2026-02-10 · Red Hat rating Moderate
    python3.12 security update
    • Red Hat Enterprise Linux AppStream (v. 8) python3.12-3.12.12-2.el8_10, python3.12-devel-3.12.12-2.el8_10, python3.12-libs-3.12.12-2.el8_10 +2
    • Red Hat Enterprise Linux CRB (v. 8) python3.12-3.12.12-2.el8_10, python3.12-debug-3.12.12-2.el8_10, python3.12-idle-3.12.12-2.el8_10 +2
  • RHSA-2026:2233 Released 2026-02-09 · Red Hat rating Moderate
    python3.12 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) python-unversioned-command-3.12.9-2.el10_0.6, python3-devel-3.12.9-2.el10_0.6, python3-tkinter-3.12.9-2.el10_0.6
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) python3-3.12.9-2.el10_0.6, python3-libs-3.12.9-2.el10_0.6, python3.12-3.12.9-2.el10_0.6
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) python3-debug-3.12.9-2.el10_0.6, python3-idle-3.12.9-2.el10_0.6, python3-test-3.12.9-2.el10_0.6
  • RHSA-2026:2084 Released 2026-02-05 · Red Hat rating Moderate
    python3.11 security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) python3.11-3.11.2-2.el8_8.7, python3.11-devel-3.11.2-2.el8_8.7, python3.11-libs-3.11.2-2.el8_8.7 +2
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) python3.11-3.11.2-2.el8_8.7, python3.11-devel-3.11.2-2.el8_8.7, python3.11-libs-3.11.2-2.el8_8.7 +2
  • RHSA-2026:1893 Released 2026-02-04 · Red Hat rating Moderate
    python3.11 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) python3.11-3.11.7-1.el9_4.10, python3.11-debug-3.11.7-1.el9_4.10, python3.11-idle-3.11.7-1.el9_4.10 +2
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) python3.11-3.11.7-1.el9_4.10, python3.11-devel-3.11.7-1.el9_4.10, python3.11-libs-3.11.7-1.el9_4.10 +1
  • RHSA-2026:1892 Released 2026-02-04 · Red Hat rating Moderate
    python3.11 security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) python3.11-3.11.11-2.el9_6.4, python3.11-debug-3.11.11-2.el9_6.4, python3.11-idle-3.11.11-2.el9_6.4 +2
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) python3.11-3.11.11-2.el9_6.4, python3.11-devel-3.11.11-2.el9_6.4, python3.11-libs-3.11.11-2.el9_6.4 +1
  • RHSA-2026:1922 Released 2026-02-04 · Red Hat rating Moderate
    python3.11 security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) python3.11-3.11.2-2.el9_2.9, python3.11-devel-3.11.2-2.el9_2.9, python3.11-libs-3.11.2-2.el9_2.9 +1
  • RHSA-2026:1828 Released 2026-02-03 · Red Hat rating Moderate
    python3.12 security update
    • Red Hat Enterprise Linux AppStream (v. 10) python-unversioned-command-3.12.12-3.el10_1, python3-devel-3.12.12-3.el10_1, python3-tkinter-3.12.12-3.el10_1
    • Red Hat Enterprise Linux BaseOS (v. 10) python3-3.12.12-3.el10_1, python3-libs-3.12.12-3.el10_1, python3.12-3.12.12-3.el10_1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) python3-debug-3.12.12-3.el10_1, python3-idle-3.12.12-3.el10_1, python3-test-3.12.12-3.el10_1
  • RHSA-2026:1736 Released 2026-02-02 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:1410 Released 2026-01-27 · Red Hat rating Moderate
    python3.11 security update
    • Red Hat Enterprise Linux AppStream (v. 9) python3.11-3.11.13-5.el9_7, python3.11-devel-3.11.13-5.el9_7, python3.11-libs-3.11.13-5.el9_7 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) python3.11-3.11.13-5.el9_7, python3.11-debug-3.11.13-5.el9_7, python3.11-idle-3.11.13-5.el9_7 +2
  • RHSA-2026:1408 Released 2026-01-27 · Red Hat rating Moderate
    python3.12 security update
    • Red Hat Enterprise Linux AppStream (v. 9) python3.12-3.12.12-4.el9_7, python3.12-devel-3.12.12-4.el9_7, python3.12-libs-3.12.12-4.el9_7 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) python3.12-3.12.12-4.el9_7, python3.12-debug-3.12.12-4.el9_7, python3.12-idle-3.12.12-4.el9_7 +2
  • RHSA-2026:1374 Released 2026-01-27 · Red Hat rating Moderate
    python3.11 security update
    • Red Hat Enterprise Linux AppStream (v. 8) python3.11-3.11.13-4.el8_10, python3.11-devel-3.11.13-4.el8_10, python3.11-libs-3.11.13-4.el8_10 +2
    • Red Hat Enterprise Linux CRB (v. 8) python3.11-3.11.13-4.el8_10, python3.11-debug-3.11.13-4.el8_10, python3.11-idle-3.11.13-4.el8_10 +2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix planned: Will not fix
Red Hat AI Inference Server 3.3Fixed RHSA-2026:16174, RHSA-2026:8746, RHSA-2026:8747, RHSA-2026:8748
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:1893, RHSA-2026:3897
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:1892, RHSA-2026:3900
Red Hat Discovery 2Fixed RHSA-2026:1736
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:1828
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:1374, RHSA-2026:2419
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:1408, RHSA-2026:1410
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:2084
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:1922
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:2233
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:1893, RHSA-2026:3897
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:1892, RHSA-2026:3900
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:2084
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:1828
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:2233
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:1374, RHSA-2026:2419
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:1828
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:1408, RHSA-2026:1410
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:2233
Red Hat Hardened ImagesFixed RHSA-2026:7443, RHSA-2026:7661, RHSA-2026:8822, RHSA-2026:8824
Red Hat Update Infrastructure 5Fixed RHSA-2026:2563, RHSA-2026:4943
Not affected: 10 products
  • Red Hat Discovery 2
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux AI (RHEL AI)
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift Dev Spaces
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-13836
  2. 2026-10-03 Alias added: GHSA-399h-rrqc-rpgv

References

Patch 8

Advisory 1

  • TI-2024-07037 Quadratic complexity parsing cookies with backslashes CVSS 3.1HIGH 7.5
  • TI-2024-11791 Bypass extraction filter to modify file metadata outside extraction directory CVSS 3.1MEDIUM 5.3
  • TI-2024-00411 Quoted zip-bomb protection for zipfile CVSS 3.1MEDIUM 6.2
  • TI-2026-13296 `HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matching CVSS 4.0MEDIUM 6.0
  • TI-2024-06422 Email header injection due to unquoted newlines CVSS 3.1MEDIUM 5.5
  • TI-2026-04606 Possible to hijack modules in current working directory CVSS 4.0MEDIUM 5.6
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences