Uh oh!
There was an error while loading. Please reload this page.
[3.12] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) - #139527
Merged
Merged
Conversation
CVE-2025-59375) (pythonGH-139234) Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available on Expat parsers, that is, parsers created by `xml.parsers.expat.ParserCreate()`, as: - `parser.SetAllocTrackerActivationThreshold(threshold)`, and - `parser.SetAllocTrackerMaximumAmplification(max_factor)`. (cherry picked from commit f04bea4) Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
…on API (python#139366) Fix some typos left in f04bea4, and simplify some internal functions to ease maintenance of future mitigation APIs. (cherry picked from commit 68a1778)
picnixz
commented
Oct 7, 2025
Member
To have a good synchronization, we'll also delay 3.10 to 3.13 backports for their next release cycle (see #139359 (comment)). |
ambv
commented
Oct 8, 2025
Contributor
I set DO-NOT-MERGE to avoid confusion. Unset that when you think we should be releasing this. |
picnixz
approved these changes
Nov 8, 2025
picnixz
left a comment
Member
There was a problem hiding this comment.
The 22 additional lines are in the clinic file so all good.
hartwork
commented
Nov 22, 2025
ContributorAuthor
@Yhg1s do you have a minute for this? 🙏 |
hartwork
commented
Dec 17, 2025
ContributorAuthor
@Yhg1s do you have a minute? 🙏 |
Uh oh!
There was an error while loading. Please reload this page.
hartwork
commented
Dec 17, 2025
ContributorAuthor
Thanks! 🙏 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for freeto join this conversation on GitHub.
Already have an account?
Sign in to comment
5 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance).
The exposed APIs are available on Expat parsers, that is, parsers created by
xml.parsers.expat.ParserCreate(), as:parser.SetAllocTrackerActivationThreshold(threshold), andparser.SetAllocTrackerMaximumAmplification(max_factor).(cherry picked from commit f04bea4)
CC @picnixz
📚 Documentation preview 📚: https://cpython-previews--139527.org.readthedocs.build/