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94 vulnerabilities found for CPython by Python Software Foundation
CVE-2026-3446 (GCVE-0-2026-3446)
Vulnerability from nvd – Published: 2026-04-10 18:17 – Updated: 2026-04-10 18:26
VLAI?
Title
Base64 decoding stops at first padded quad by default
Summary
When calling base64.b64decode() or related functions the decoding process would stop after encountering the first padded quad regardless of whether there was more information to be processed. This can lead to data being accepted which may be processed differently by other implementations. Use "validate=True" to enable stricter processing of base64 data.
Severity ?
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
Credits
Serhiy Storchaka
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CVE-2026-1502 (GCVE-0-2026-1502)
Vulnerability from nvd – Published: 2026-04-10 17:54 – Updated: 2026-04-11 04:39
VLAI?
Title
HTTP client proxy tunnel headers not validated for CR/LF
Summary
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
Severity ?
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.15.0
(python)
|
Credits
senseicat
Seth Larson
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CVE-2026-4519 (GCVE-0-2026-4519)
Vulnerability from nvd – Published: 2026-03-20 15:08 – Updated: 2026-04-07 22:01
VLAI?
Title
webbrowser.open() allows leading dashes in URLs
Summary
The webbrowser.open() API would accept leading dashes in the URL which
could be handled as command line options for certain web browsers. New
behavior rejects leading dashes. Users are recommended to sanitize URLs
prior to passing to webbrowser.open().
Severity ?
CWE
- CWE-20 - Improper Input Validation
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
Credits
Seth Larson
Gregory P. Smith
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CVE-2026-3479 (GCVE-0-2026-3479)
Vulnerability from nvd – Published: 2026-03-18 18:13 – Updated: 2026-04-07 22:01 Disputed
VLAI?
Title
pkgutil.get_data() does not enforce documented restrictions
Summary
DISPUTED: The project has clarified that the documentation was incorrect, and that pkgutil.get_data() has the same security model as open(). The documentation has been updated to clarify this point. There is no vulnerability in the function if following the intended security model.
pkgutil.get_data() did not validate the resource argument as documented, allowing path traversals.
Severity ?
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
| URL | Tags | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
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CVE-2026-4224 (GCVE-0-2026-4224)
Vulnerability from nvd – Published: 2026-03-16 17:52 – Updated: 2026-04-08 12:55
VLAI?
Title
Stack overflow parsing XML with deeply nested DTD content models
Summary
When an Expat parser with a registered ElementDeclHandler parses an inline
document type definition containing a deeply nested content model a C stack
overflow occurs.
Severity ?
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
| URL | Tags | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
Credits
Gil Portnoy
Stan Ulbrych
Bénédikt Tran
Stan Ulbrych
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CVE-2026-3644 (GCVE-0-2026-3644)
Vulnerability from nvd – Published: 2026-03-16 17:37 – Updated: 2026-04-07 22:01
VLAI?
Title
Incomplete control character validation in http.cookies
Summary
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().
Severity ?
Assigner
References
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
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| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
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Credits
Stan Ulbrych
Stan Ulbrych
Victor Stinner
Seth Larson
Vyom Yadav
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CVE-2025-13462 (GCVE-0-2025-13462)
Vulnerability from nvd – Published: 2026-03-12 17:59 – Updated: 2026-04-07 21:59
VLAI?
Title
tarfile: Skip DIRTYPE normalization during GNU LONGNAME/LONGLINK handling
Summary
The "tarfile" module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK. This could result in a crafted tar archive being misinterpreted by the tarfile module compared to other implementations.
Severity ?
CWE
Assigner
References
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
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CVE-2026-2297 (GCVE-0-2026-2297)
Vulnerability from nvd – Published: 2026-03-04 22:10 – Updated: 2026-04-07 22:01
VLAI?
Title
SourcelessFileLoader does not use io.open_code()
Summary
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Severity ?
CWE
- CWE-668 - Exposure of Resource to Wrong Sphere
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a7 (python) |
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CVE-2026-1299 (GCVE-0-2026-1299)
Vulnerability from nvd – Published: 2026-01-23 16:27 – Updated: 2026-03-03 14:43
VLAI?
Title
email BytesGenerator header injection due to unquoted newlines
Summary
The
email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when
serializing an email message allowing for header injection when an email
is serialized. This is only applicable if using "LiteralHeader" writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".
Severity ?
CWE
Assigner
References
| URL | Tags | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
Affected: 3.11.0 , < 3.11.15 (python) Affected: 3.12.0 , < 3.12.13 (python) Affected: 3.13.0 , < 3.13.12 (python) Affected: 3.14.0 , < 3.14.3 (python) Affected: 3.15.0a1 , < 3.15.0a6 (python) |
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CVE-2025-12781 (GCVE-0-2025-12781)
Vulnerability from nvd – Published: 2026-01-21 19:34 – Updated: 2026-01-22 20:12
VLAI?
Title
base64.b64decode() always accepts "+/" characters, despite setting altchars
Summary
When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode() functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. This behavior matches what is recommended in earlier base64 RFCs, but newer RFCs now recommend either dropping characters outside the specified base64 alphabet or raising an error. The old behavior has the possibility of causing data integrity issues.
This behavior can only be insecure if your application uses an alternate base64 alphabet (without "+/"). If your application does not use the "altchars" parameter or the urlsafe_b64decode() function, then your application does not use an alternative base64 alphabet.
The attached patches DOES NOT make the base64-decode behavior raise an error, as this would be a change in behavior and break existing programs. Instead, the patch deprecates the behavior which will be replaced with the newly recommended behavior in a future version of Python. Users are recommended to mitigate by verifying user-controlled inputs match the base64
alphabet they are expecting or verify that their application would not be
affected if the b64decode() functions accepted "+" or "/" outside of altchars.
Severity ?
CWE
- CWE-704 - Incorrect Type Conversion or Cast
Assigner
References
| URL | Tags | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.10
(python)
Affected: 3.14.0 , < 3.14.1 (python) Affected: 3.15.0a1 , < 3.15.0a2 (python) |
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CVE-2026-0865 (GCVE-0-2026-0865)
Vulnerability from nvd – Published: 2026-01-20 21:26 – Updated: 2026-03-03 14:43
VLAI?
Title
wsgiref.headers.Headers allows header newline injection
Summary
User-controlled header names and values containing newlines can allow injecting HTTP headers.
Severity ?
CWE
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
Affected: 3.11.0 , < 3.11.15 (python) Affected: 3.12.0 , < 3.12.13 (python) Affected: 3.13.0 , < 3.13.12 (python) Affected: 3.14.0 , < 3.14.3 (python) Affected: 3.15.0a1 , < 3.15.0a6 (python) |
Credits
Omar M. Hasan
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CVE-2026-0672 (GCVE-0-2026-0672)
Vulnerability from nvd – Published: 2026-01-20 21:52 – Updated: 2026-03-03 14:43
VLAI?
Title
Header injection in http.cookies.Morsel
Summary
When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.
Severity ?
CWE
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
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Credits
Omar M. Hasan
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CVE-2025-15367 (GCVE-0-2025-15367)
Vulnerability from nvd – Published: 2026-01-20 21:47 – Updated: 2026-02-26 14:44
VLAI?
Title
POP3 command injection in user-controlled commands
Summary
The poplib module, when passed a user-controlled command, can have
additional commands injected using newlines. Mitigation rejects commands
containing control characters.
Severity ?
CWE
- CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.15.0a6
(python)
|
Credits
Omar M. Hasan
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CVE-2025-15366 (GCVE-0-2025-15366)
Vulnerability from nvd – Published: 2026-01-20 21:40 – Updated: 2026-02-26 14:44
VLAI?
Title
IMAP command injection in user-controlled commands
Summary
The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.
Severity ?
CWE
- CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.15.0a6
(python)
|
Credits
Omar M. Hasan
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CVE-2025-15282 (GCVE-0-2025-15282)
Vulnerability from nvd – Published: 2026-01-20 21:35 – Updated: 2026-03-03 14:42
VLAI?
Title
Header injection via newlines in data URL mediatype
Summary
User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
Severity ?
CWE
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
Affected: 3.11.0 , < 3.11.15 (python) Affected: 3.12.0 , < 3.12.13 (python) Affected: 3.13.0 , < 3.13.12 (python) Affected: 3.14.0 , < 3.14.3 (python) Affected: 3.15.0a1 , < 3.15.0a6 (python) |
Credits
Omar M. Hasan
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CVE-2025-11468 (GCVE-0-2025-11468)
Vulnerability from nvd – Published: 2026-01-20 21:09 – Updated: 2026-03-03 14:41
VLAI?
Title
Folding email comments of unfoldable characters doesn't preserve parenthesis
Summary
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.
Severity ?
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
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Credits
Denis Ledoux
Seth Larson
Denis Ledoux
R. David Murray
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CVE-2026-3446 (GCVE-0-2026-3446)
Vulnerability from cvelistv5 – Published: 2026-04-10 18:17 – Updated: 2026-04-10 18:26
VLAI?
Title
Base64 decoding stops at first padded quad by default
Summary
When calling base64.b64decode() or related functions the decoding process would stop after encountering the first padded quad regardless of whether there was more information to be processed. This can lead to data being accepted which may be processed differently by other implementations. Use "validate=True" to enable stricter processing of base64 data.
Severity ?
Assigner
References
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
Credits
Serhiy Storchaka
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CVE-2026-1502 (GCVE-0-2026-1502)
Vulnerability from cvelistv5 – Published: 2026-04-10 17:54 – Updated: 2026-04-11 04:39
VLAI?
Title
HTTP client proxy tunnel headers not validated for CR/LF
Summary
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
Severity ?
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.15.0
(python)
|
Credits
senseicat
Seth Larson
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CVE-2026-4519 (GCVE-0-2026-4519)
Vulnerability from cvelistv5 – Published: 2026-03-20 15:08 – Updated: 2026-04-07 22:01
VLAI?
Title
webbrowser.open() allows leading dashes in URLs
Summary
The webbrowser.open() API would accept leading dashes in the URL which
could be handled as command line options for certain web browsers. New
behavior rejects leading dashes. Users are recommended to sanitize URLs
prior to passing to webbrowser.open().
Severity ?
CWE
- CWE-20 - Improper Input Validation
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
Credits
Seth Larson
Gregory P. Smith
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CVE-2026-3479 (GCVE-0-2026-3479)
Vulnerability from cvelistv5 – Published: 2026-03-18 18:13 – Updated: 2026-04-07 22:01 Disputed
VLAI?
Title
pkgutil.get_data() does not enforce documented restrictions
Summary
DISPUTED: The project has clarified that the documentation was incorrect, and that pkgutil.get_data() has the same security model as open(). The documentation has been updated to clarify this point. There is no vulnerability in the function if following the intended security model.
pkgutil.get_data() did not validate the resource argument as documented, allowing path traversals.
Severity ?
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
| URL | Tags | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
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CVE-2026-4224 (GCVE-0-2026-4224)
Vulnerability from cvelistv5 – Published: 2026-03-16 17:52 – Updated: 2026-04-08 12:55
VLAI?
Title
Stack overflow parsing XML with deeply nested DTD content models
Summary
When an Expat parser with a registered ElementDeclHandler parses an inline
document type definition containing a deeply nested content model a C stack
overflow occurs.
Severity ?
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
| URL | Tags | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
Credits
Gil Portnoy
Stan Ulbrych
Bénédikt Tran
Stan Ulbrych
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CVE-2026-3644 (GCVE-0-2026-3644)
Vulnerability from cvelistv5 – Published: 2026-03-16 17:37 – Updated: 2026-04-07 22:01
VLAI?
Title
Incomplete control character validation in http.cookies
Summary
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().
Severity ?
Assigner
References
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a8 (python) |
Credits
Stan Ulbrych
Stan Ulbrych
Victor Stinner
Seth Larson
Vyom Yadav
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CVE-2025-13462 (GCVE-0-2025-13462)
Vulnerability from cvelistv5 – Published: 2026-03-12 17:59 – Updated: 2026-04-07 21:59
VLAI?
Title
tarfile: Skip DIRTYPE normalization during GNU LONGNAME/LONGLINK handling
Summary
The "tarfile" module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK. This could result in a crafted tar archive being misinterpreted by the tarfile module compared to other implementations.
Severity ?
CWE
Assigner
References
| URL | Tags | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
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CVE-2026-2297 (GCVE-0-2026-2297)
Vulnerability from cvelistv5 – Published: 2026-03-04 22:10 – Updated: 2026-04-07 22:01
VLAI?
Title
SourcelessFileLoader does not use io.open_code()
Summary
The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.
Severity ?
CWE
- CWE-668 - Exposure of Resource to Wrong Sphere
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.13
(python)
Affected: 3.14.0 , < 3.14.4 (python) Affected: 3.15.0a1 , < 3.15.0a7 (python) |
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CVE-2026-1299 (GCVE-0-2026-1299)
Vulnerability from cvelistv5 – Published: 2026-01-23 16:27 – Updated: 2026-03-03 14:43
VLAI?
Title
email BytesGenerator header injection due to unquoted newlines
Summary
The
email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when
serializing an email message allowing for header injection when an email
is serialized. This is only applicable if using "LiteralHeader" writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".
Severity ?
CWE
Assigner
References
| URL | Tags | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
Affected: 3.11.0 , < 3.11.15 (python) Affected: 3.12.0 , < 3.12.13 (python) Affected: 3.13.0 , < 3.13.12 (python) Affected: 3.14.0 , < 3.14.3 (python) Affected: 3.15.0a1 , < 3.15.0a6 (python) |
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CVE-2025-12781 (GCVE-0-2025-12781)
Vulnerability from cvelistv5 – Published: 2026-01-21 19:34 – Updated: 2026-01-22 20:12
VLAI?
Title
base64.b64decode() always accepts "+/" characters, despite setting altchars
Summary
When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode() functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. This behavior matches what is recommended in earlier base64 RFCs, but newer RFCs now recommend either dropping characters outside the specified base64 alphabet or raising an error. The old behavior has the possibility of causing data integrity issues.
This behavior can only be insecure if your application uses an alternate base64 alphabet (without "+/"). If your application does not use the "altchars" parameter or the urlsafe_b64decode() function, then your application does not use an alternative base64 alphabet.
The attached patches DOES NOT make the base64-decode behavior raise an error, as this would be a change in behavior and break existing programs. Instead, the patch deprecates the behavior which will be replaced with the newly recommended behavior in a future version of Python. Users are recommended to mitigate by verifying user-controlled inputs match the base64
alphabet they are expecting or verify that their application would not be
affected if the b64decode() functions accepted "+" or "/" outside of altchars.
Severity ?
CWE
- CWE-704 - Incorrect Type Conversion or Cast
Assigner
References
| URL | Tags | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.13.10
(python)
Affected: 3.14.0 , < 3.14.1 (python) Affected: 3.15.0a1 , < 3.15.0a2 (python) |
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CVE-2026-0672 (GCVE-0-2026-0672)
Vulnerability from cvelistv5 – Published: 2026-01-20 21:52 – Updated: 2026-03-03 14:43
VLAI?
Title
Header injection in http.cookies.Morsel
Summary
When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.
Severity ?
CWE
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
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Credits
Omar M. Hasan
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CVE-2025-15367 (GCVE-0-2025-15367)
Vulnerability from cvelistv5 – Published: 2026-01-20 21:47 – Updated: 2026-02-26 14:44
VLAI?
Title
POP3 command injection in user-controlled commands
Summary
The poplib module, when passed a user-controlled command, can have
additional commands injected using newlines. Mitigation rejects commands
containing control characters.
Severity ?
CWE
- CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.15.0a6
(python)
|
Credits
Omar M. Hasan
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CVE-2025-15366 (GCVE-0-2025-15366)
Vulnerability from cvelistv5 – Published: 2026-01-20 21:40 – Updated: 2026-02-26 14:44
VLAI?
Title
IMAP command injection in user-controlled commands
Summary
The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.
Severity ?
CWE
- CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.15.0a6
(python)
|
Credits
Omar M. Hasan
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CVE-2025-15282 (GCVE-0-2025-15282)
Vulnerability from cvelistv5 – Published: 2026-01-20 21:35 – Updated: 2026-03-03 14:42
VLAI?
Title
Header injection via newlines in data URL mediatype
Summary
User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
Severity ?
CWE
Assigner
References
| URL | Tags | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.10.20
(python)
Affected: 3.11.0 , < 3.11.15 (python) Affected: 3.12.0 , < 3.12.13 (python) Affected: 3.13.0 , < 3.13.12 (python) Affected: 3.14.0 , < 3.14.3 (python) Affected: 3.15.0a1 , < 3.15.0a6 (python) |
Credits
Omar M. Hasan
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