9.4

CVE-2026-115557: Distrust compromised intermediate certificates in ssl module

Awaiting analysis
AliasesDEBIAN-CVE-2026-115557UBUNTU-CVE-2026-115557ALPINE-CVE-2026-115557
Published 24-10-2026Last modified 02-11-2026

Vulnerability summary

CVE-2026-115557 is a critical (CVSS 9.4) vulnerability in python software foundation cpython. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 45.1% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.4 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.4/10
010
Critical · v4.0 (CVE.org)
EPSS score
0.53%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12348-1

Timeline

  1. 24-10-2026
    PublishedVulnerability first disclosed.
  2. 02-11-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.53%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

25-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu11 products
  • python2.7All versions (No fix recorded)
  • python3.10All versions (No fix recorded)
  • python3.11All versions (No fix recorded)
  • python3.12All versions (No fix recorded)
  • python3.14All versions (No fix recorded)
Debian4 products
  • python3.11All versions (No fix recorded)
  • python3.13All versions (No fix recorded)
  • python3.14All versions (No fix recorded) | < 3.14.10-1
  • python3.15All versions (No fix recorded) | < 3.15.2-1
Chainguard3 products
  • python-3.10All versions (No fix recorded)
  • python-3.14All versions (No fix recorded) | < 3.14.10_git20261028-r0
  • python-3.15All versions (No fix recorded) | < 3.15.2_git20261030-r0
Wolfi3 products
  • python-3.10All versions (No fix recorded)
  • python-3.14All versions (No fix recorded) | < 3.14.10_git20261028-r0
  • python-3.15All versions (No fix recorded) | < 3.15.2_git20261030-r0
Alpine1 product
  • python3< 3.12.16-r0 | < 3.14.10-r0
Python software foundation1 product
  • cpython< 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 | ≥ 3.16.0a1, < 3.16.0

6 vendors · 23 products

References

25 links
Show all 25 references