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NVD / CVE Program· CNA PSF

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

Noroxi assessment

Priority: Monitor (action score 16/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. Administrator privileges are required. No special conditions are required; it is repeatable.
  • Fixed version: Python Software Foundation CPython 3.10.21, 3.11.16, 3.12.14; azl3 python-py 1.11.0-1 on Azure Linux 3.0 Release Notes; azl3 python3 3.12.9-14 on Azure Linux 3.0 3.12.9-14.

Low priority for now. Upgrade to Python Software Foundation CPython 3.10.21, 3.11.16, 3.12.14; azl3 python-py 1.11.0-1 on Azure Linux 3.0 Release Notes; azl3 python3 3.12.9-14 on Azure Linux 3.0 3.12.9-14 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 4.1 · v4.0—No exploit Fix available
Published
Jun 23, 2026
Updated
Oct 25, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

16

Monitor

Low priority for now.

CVSS
16 / 40 · 4.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · PSF
4.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
pythonpython

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • python pythonbefore 3.10.21
  • python python3.11.0 and later · before 3.11.16
  • python python3.12.0 and later · before 3.12.14
  • python python3.13.0 and later · before 3.13.15
  • python python3.14.0 and later · before 3.14.7
  • python python3.15.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (PSF). Independent of NVD's CPE analysis and usually ahead of it.

  • Python Software Foundation CPython

    • before 3.10.21affected · python
    • 3.11.0 and later · before 3.11.16affected · python
    • 3.12.0 and later · before 3.12.14affected · python
    • 3.13.0 and later · before 3.13.15affected · python
    • 3.14.0 and later · before 3.14.7affected · python
    • 3.15.0a1 and later · before 3.15.0b4affected · python

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.21python3before 3.12.14-r03.12.14-r0
Alpine:v3.24python3before 3.14.7-r03.14.7-r0
Debian:12pypy3from 0—
Debian:12python3.11from 0—
Debian:13python3.13before 3.13.5-2+deb13u53.13.5-2+deb13u5
Debian:14pypy3before 8.0.0+dfsg-18.0.0+dfsg-1
Debian:14python3.14before 3.14.7-13.14.7-1
openSUSE:Leap 16.0python313before 3.13.14-160000.2.13.13.14-160000.2.1
openSUSE:Leap 16.0python313-corebefore 3.13.14-160000.2.13.13.14-160000.2.1
openSUSE:Leap 16.0python313-documentationbefore 3.13.14-160000.2.13.13.14-160000.2.1
openSUSE:Leap 16.0python313-nogilbefore 3.13.14-160000.2.13.13.14-160000.2.1
openSUSE:Leap 16.0python313-nogil-nogil-corebefore 3.13.14-160000.2.13.13.14-160000.2.1
openSUSE:Tumbleweedpython310before 3.10.20-8.13.10.20-8.1
openSUSE:Tumbleweedpython311before 3.11.15-8.13.11.15-8.1
openSUSE:Tumbleweedpython312before 3.12.13-8.13.12.13-8.1
openSUSE:Tumbleweedpython313before 3.13.14-2.13.13.14-2.1
openSUSE:Tumbleweedpython315before 3.15.0~b4-1.13.15.0~b4-1.1
SUSE:EL-10:Update:Products:MultiLinuxManagerTools:Updatesaltbundlepybefore 3.11.15-100002.1.9.13.11.15-100002.1.9.1
SUSE:EL-10:Update:Products:MultiLinuxManagerTools:Updatesaltbundlepy-cffibefore 1.17.1-100002.1.6.21.17.1-100002.1.6.2
SUSE:EL-10:Update:Products:MultiLinuxManagerTools:Updatesaltbundlepy-corebefore 3.11.15-100002.1.9.13.11.15-100002.1.9.1
SUSE:EL-10:Update:Products:MultiLinuxManagerTools:Updatesaltbundlepy-cryptographybefore 3.3.2-100002.1.6.23.3.2-100002.1.6.2
SUSE:EL-10:Update:Products:MultiLinuxManagerTools:Updatesaltbundlepy-cssselectbefore 1.3.0-100002.1.6.21.3.0-100002.1.6.2
SUSE:EL-10:Update:Products:MultiLinuxManagerTools:Updatesaltbundlepy-editablesbefore 0.5-100002.1.6.20.5-100002.1.6.2
SUSE:EL-10:Update:Products:MultiLinuxManagerTools:Updatesaltbundlepy-exceptiongroupbefore 1.2.2-100002.1.6.21.2.2-100002.1.6.2

+96

Same product

python: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-5636Integer overflow in the get_data function in zipimport.c in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2…
    47Plan
  • CVE-2007-4559Directory traversal vulnerability in the (1) extract and (2) extractall functions in the tarfile module in Python allows user-assisted…
    47Plan
  • CVE-2021-3177Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain…
    46Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-3087Apr 27, 2026 · shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
    24Monitor
  • ← EarlierCVE-2026-7210May 11, 2026 · The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
    25Monitor
  • Later →CVE-2026-4360Jun 30, 2026 · Tarfile.extract() doesn't fully respect filter parameter
    8Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Python Software Foundation CPython3.10.21Vendor (CNA)
Python Software Foundation CPython3.11.16Vendor (CNA)
Python Software Foundation CPython3.12.14Vendor (CNA)
Python Software Foundation CPython3.13.15Vendor (CNA)
Python Software Foundation CPython3.14.7Vendor (CNA)
Python Software Foundation CPython3.15.0b4Vendor (CNA)
azl3 python-py 1.11.0-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 python3 3.12.9-14 on Azure Linux 3.03.12.9-14 · CBL-Mariner ReleasesMicrosoft (MSRC)
alpine:python33.12.14-r0 · Alpine:v3.21Package registry (OSV)
debian:pypy38.0.0+dfsg-1 · Debian:14Package registry (OSV)
debian:python3.133.13.5-2+deb13u5 · Debian:13Package registry (OSV)
debian:python3.143.14.7-1 · Debian:14Package registry (OSV)
opensuse:python3103.10.20-8.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3113.11.15-8.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3123.12.13-8.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3133.13.14-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python313-core3.13.14-160000.2.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python313-documentation3.13.14-160000.2.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python313-nogil3.13.14-160000.2.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python313-nogil-nogil-core3.13.14-160000.2.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python3153.15.0~b4-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:python33.4.10-25.191.2 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:python3-base3.4.10-25.191.2 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:python3103.10.20-150400.4.115.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:python310-core3.10.20-150400.4.115.2 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:python3113.11.15-slfo.1.1_5.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:python311-core3.11.15-slfo.1.1_5.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:python311-documentation3.11.15-150400.9.94.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSPackage registry (OSV)
suse:python3123.12.13-150600.3.62.1 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)
suse:python312-core3.12.13-150600.3.62.3 · SUSE:Linux Enterprise Server 15 SP6-LTSSPackage registry (OSV)

+3

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • Administrator privileges are required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
P
Scope
X

Weakness class (CWE)

CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/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-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records