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Fencer Vulns
critical 9.4

CVE-2026-115557 json

Distrust compromised intermediate certificates in ssl module

published 2026-10-24 15 d ago modified 2026-11-02 6 d ago also BIT-libpython-2026-115557 , BIT-python-2026-115557 , BIT-python-min-2026-115557 , EUVD-2026-109299

cvss
9.4
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.

Patch / fix

  • bitnami libpython 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2
  • bitnami python 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2
  • bitnami python-min 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2
  • Python Software Foundation CPython 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2, 3.16.0
  • python3.14 Debian 14 3.14.10-1
  • python3.15 Debian 14 3.15.2-1

debian advisories DEBIAN-CVE-2026-115557

  • python315 openSUSE Tumbleweed 3.15.2-1.1

opensuse advisories openSUSE-SU-2026:12348-1

  • python3 Alpine 3.23, Alpine 3.22, Alpine 3.21 3.12.16-r0
  • python3 Alpine 3.24 3.14.10-r0

alpine advisories ALPINE-CVE-2026-115557

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python3 Azure Linux 3.0 3.12.15-3

azure linux advisories AZL-111101

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-115557 updated cvss 6.8

python: Distrust compromised eMudhra intermediate certificates in Python ssl module

  • Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools Red Hat Enterprise Linux 7 python, python3, tkinter, python-libs, python-test, python-tools, +4 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 python3, python3.12, python3-idle, python3-libs, python3-test, platform-python, +6 more Red Hat Enterprise Linux 9 python3, python3.9, python3.12, python3.14, python3-idle, python3-libs, +16 more Red Hat Enterprise Linux 10 python3.12, python3.14 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9, +1 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images python3.12, python3.14, python3.13 3.13.17-1.hum1, python3.15 3.15.2-0.1.hum1, python3.10 3.10.22-1.1.hum1, python3.11 3.11.17-1.1.hum1
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Virtualization 4 container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat OpenShift Virtualization 5 container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat Self-service automation portal 2 ansible-automation-platform/bootc-automation-portal-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 8 scipy, python36, python-nose, python-wheel, python3-bson, python3-nose, +19 more Red Hat Hardened Images hi/python
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
6 d ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 9.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA 4.0 9.4 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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

Affected packages

ecosystem package affected fixed in
bitnami libpython
<3.11.18
>=3.12.0, <3.12.16
>=3.13.0, <3.13.18
>=3.14.0, <3.14.10
>=3.15.0, <3.15.2
3.11.18
3.12.16
3.13.18
3.14.10
3.15.2
bitnami python
<3.11.18
>=3.12.0, <3.12.16
>=3.13.0, <3.13.18
>=3.14.0, <3.14.10
>=3.15.0, <3.15.2
3.11.18
3.12.16
3.13.18
3.14.10
3.15.2
bitnami python-min
<3.11.18
>=3.12.0, <3.12.16
>=3.13.0, <3.13.18
>=3.14.0, <3.14.10
>=3.15.0, <3.15.2
3.11.18
3.12.16
3.13.18
3.14.10
3.15.2

Affected products

  • Python Software Foundation CPython

Classification

Weakness
  • CWE-299 Improper Check for Certificate Revocation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.