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GeezerVison is showing github.com — [3.12] gh-135034: Normalize link targets in tarfile, add `os.path.realpath(strict='allow_missing')` (GH-135037) by Yhg1s · Pull Request #135066 · python/cpython

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@Yhg1s

@Yhg1s Yhg1s commented Jun 3, 2025 •
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Addresses CVEs 2024-12718, 2025-4138, 2025-4330, and 2025-4517.
(cherry picked from commit 3612d8f)

Co-authored-by: Łukasz Langa [email protected]
Co-authored-by: Petr Viktorin [email protected]
Co-authored-by: Seth Michael Larson [email protected]
Co-authored-by: Adam Turner [email protected]
Co-authored-by: Serhiy Storchaka [email protected]

  • Issue: Multiple tarfile extraction filter bypasses (filter="tar"/filter="data") #135034

📚 Documentation preview 📚: https://cpython-previews--135066.org.readthedocs.build/

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All reactions
@ambv @encukou
@sethmlarson @AA-Turner @serhiy-storchaka @Yhg1s
[3.12] pythongh-135034: Normalize link targets in tarfile, add `os.pa…
c358142 
…th.realpath(strict='allow_missing')` (pythonGH-135037)

Addresses CVEs 2024-12718, 2025-4138, 2025-4330, and 2025-4517.
(cherry picked from commit 3612d8f)

Co-authored-by: Łukasz Langa <[email protected]>
Signed-off-by: Łukasz Langa <[email protected]>
Co-authored-by: Petr Viktorin <[email protected]>
Co-authored-by: Seth Michael Larson <[email protected]>
Co-authored-by: Adam Turner <[email protected]>
Co-authored-by: Serhiy Storchaka <[email protected]>
@Yhg1s
Yhg1s requested review from ambv and encukou June 3, 2025 11:25
@Yhg1s
Yhg1s requested a review from ethanfurman as a code owner June 3, 2025 11:25
@bedevere-app bedevere-app Bot added the awaiting core review label Jun 3, 2025
This was referenced Jun 3, 2025
gh-135034: Normalize link targets in tarfile, add os.path.realpath(strict='allow_missing') #135037
Merged
Multiple tarfile extraction filter bypasses (filter="tar"/filter="data") #135034
Closed
Yhg1s and others added 9 commits June 3, 2025 13:36
@Yhg1s
Fix merge snafu
3c10cf0
@Yhg1s
Fix test failure in test_tarfile
f5f9555
@Yhg1s
Drop backport of extra tests that don't really address security conce…
2b5673e 
…rns.
@Yhg1s
Fix a few tests, and a glaring logic error in the posixpath backport.
70f9db5
@Yhg1s
Fix Windows test_ntpath failures.
1d242c3
@Yhg1s
Drop test methods for unreadable symlinks (on darwin), which aren't
12ac4a5 
handled in 3.12 like they are in 3.13.
@Yhg1s
Don't export LinkFallbackError from tarfile.
8f53def
@encukou
Add back test_realpath_unreadable_symlink_strict
2c2df0d 
This one passes on MacOS, and gives some test coverage for OSErrors
other than missing files.
@Yhg1s
Fix merge error in backport.
ead96bb
@ambv
ambv merged commit 19de092 into python:3.12 Jun 3, 2025
@bedevere-app bedevere-app Bot removed the awaiting core review label Jun 3, 2025
@Yhg1s
Yhg1s deleted the backport-3612d8f-3.12 branch August 13, 2026 12:52
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Reviewers

@ambv ambv Awaiting requested review from ambv
@encukou encukou Awaiting requested review from encukou
@ethanfurman ethanfurman Awaiting requested review from ethanfurman ethanfurman is a code owner

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3 participants

@Yhg1s @ambv @encukou
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