CVE-2026-0864
Configuration Injection via Carriage Return (\r) in write() method
No known exploitation. EPSS puts it in the 2nd percentile. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- Python Software Foundation CPythonAffected: < 3.10.21Upgrade to: 3.10.21Affected: ≥ 3.11.0, < 3.11.16Upgrade to: 3.11.16Affected: ≥ 3.12.0, < 3.12.14Upgrade to: 3.12.14Affected: ≥ 3.13.0, < 3.13.15Upgrade to: 3.13.15 + 2 more branchesStated by: CVE record
- PythonAffected: < 3.10.21Upgrade to: 3.10.21Stated by: NVD
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.1% chance of exploitation activity in the next 30 days, which ranks it in the 2nd percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
13 events over 56 days, from the signal feeds we watch.
- Patch availablerecord updated
- Record updated
- Record updated
- Record updated
- Record updatedrecord updated
- Record updated
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Scored 5.5 by NVD.
How it is reached
- Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability NoneNo availability impact
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
Watch the software you run.
My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.
We'll flag the next CVE, public exploit or patch for CPython, not every advisory.
A free account adds
- The full version matrix and every affected product
- Exploit links, proofs of concept and Metasploit modules
- Email alerts for the products you watch
- The same data over REST API, MCP and CLI