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Vulnerabilities

Vulnerability · CVE-2025-11468

When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved.

Published Jan 20, 2026 · catalog updated Mar 3, 2026 · Python Software Foundation CPython

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-11468. EPSS is 0.62%. Act only if a listed version of Python Software Foundation CPython is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.62%
Remediation
Version ranges on file
Affected products
vendor Python Software Foundation CPython 3.15.0a1 <3.15.0a6

When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Python Software Foundation CPython 3.15.0a1 <3.15.0a63.15.0a1 <3.15.0a6

How to fix CVE-2025-11468

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-11468. EPSS is 0.62%. Act only if a listed version of Python Software Foundation CPython is installed.

Which versions are affected?

Compare what you have installed with Python Software Foundation CPython 3.15.0a1 <3.15.0a6 3.15.0a1 <3.15.0a6. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.62%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 20, 2026 · EUVD

    Detected

    When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

  2. Mar 3, 2026 · EUVD

    Updated

    When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

Sources

  • CVE.orgVulnerability recordCVE-2025-11468

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-11468

    30-day exploitation probability 0.62%

    first.org
  • EUVDVulnerability recordEUVD-2025-206306

    When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026