5.5

CVE-2026-0864: Configuration Injection via Carriage Return (\r) in write() method

Analyzed
AliasesALPINE-CVE-2026-0864UBUNTU-CVE-2026-0864DEBIAN-CVE-2026-0864
Published 23-06-2026Last modified 13-08-2026

Vulnerability summary

CVE-2026-0864 is a medium (CVSS 5.5) vulnerability in python software foundation cpython. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.1, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 29 · Related 30
OPENSUSE-SU-2026:11426-1OPENSUSE-SU-2026:11427-1OPENSUSE-SU-2026:11428-1OPENSUSE-SU-2026:11429-1OPENSUSE-SU-2026:11534-1OPENSUSE-SU-2026:21595-1

Timeline

  1. 23-06-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

When using the "configparser" module to write configuration files containing multi-line text values with carriage return characters (\r) the resulting file could be injected with unexpected keys and values if the attacker controls the written value.

CVSS metrics

9 scores · 7 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.13% on 04-10-2026

04-10-202603-11-2026

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: local access, administrative account, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu12 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)
  • python3.13All versions (No fix recorded)
Chainguard5 products
  • python-3.10< 3.10.20-r10
  • python-3.11< 3.11.15-r8
  • python-3.12< 3.12.13-r10
  • python-3.13< 3.13.14-r2
  • python-3.14< 3.14.6-r3
Wolfi5 products
  • python-3.10< 3.10.20-r10
  • python-3.11< 3.11.15-r8
  • python-3.12< 3.12.13-r10
  • python-3.13< 3.13.14-r2
  • python-3.14< 3.14.6-r3
Debian4 products
  • pypy3All versions (No fix recorded) | < 8.0.0+dfsg-1
  • python3.11All versions (No fix recorded)
  • python3.13< 3.13.15-1 | < 3.13.5-2+deb13u5
  • python3.14< 3.14.7-1
Alpine1 product
  • python3< 3.12.14-r0 | < 3.14.7-r0
Python1 product
  • python< 3.10.21 | ≥ 3.11.0, < 3.11.16 | ≥ 3.12.0, < 3.12.14 | ≥ 3.13.0, < 3.13.15 | ≥ 3.14.0, < 3.14.7 | 3.15.0:alpha1 | 3.15.0:alpha2 | 3.15.0:alpha3 | 3.15.0:alpha4 | 3.15.0:alpha5 | 3.15.0:alpha6 | 3.15.0:alpha7 | 3.15.0:alpha8 | 3.15.0:beta1 | 3.15.0:beta2 | 3.15.0:beta3
Python software foundation1 product
  • cpython< 3.10.21 | ≥ 3.11.0, < 3.11.16 | ≥ 3.12.0, < 3.12.14 | ≥ 3.13.0, < 3.13.15 | ≥ 3.14.0, < 3.14.7 | ≥ 3.15.0a1, < 3.15.0b4

7 vendors · 29 products

References

17 links
Show all 17 references