8375063: Update Libpng to 1.6.54

[mrserb]

Hi all,

This pull request contains a backport of commit a2e74957 from the openjdk/jdk repository.

The commit being backported was authored by Jayathirth D V on 21 Jan 2026 and was reviewed by Sergey Bylokhov and Phil Race.

Thanks!

---

Progress

• Change must not contain extraneous whitespace
• JDK-8375063 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8375063: Update Libpng to 1.6.54 (Bug - P3 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2558/head:pull/2558
$ git checkout pull/2558

Update a local copy of the PR:
$ git checkout pull/2558
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2558/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2558

View PR using the GUI difftool:
$ git pr show -t 2558

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2558.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back serb! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@mrserb This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8375063: Update Libpng to 1.6.54

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 31 new commits pushed to the master branch:

• f0eabb7: 8375549: ConcurrentModificationException if jdk.crypto.disabledAlgorithms has multiple entries with known oid
• 153da39: 8351639: Improve debuggability of test/langtools/jdk/jshell/JdiHangingListenExecutionControlTest.java test
• 40a0781: 8075917: The regression-swing case failed as the text on label is not painted red with the GTK L&F
• ... and 28 more: https://git.openjdk.org/jdk21u-dev/compare/76aeaea7f479a3cae0178fe0e8dc1af6006fe5d8...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @mrserb This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (04ea224e)

[mrserb]

testing is in porgress

[mrserb]

/approval request
Clean backport. The 3rd-party libpng has been updated to 1.6.54. No new issues found by the JDK desktop tests.

[openjdk]

@mrserb
8375063: The approval request has been created successfully.

[mrserb]

/integrate

[openjdk]

Going to push as commit 422784f.
Since your change was applied there have been 31 commits pushed to the master branch:

• f0eabb7: 8375549: ConcurrentModificationException if jdk.crypto.disabledAlgorithms has multiple entries with known oid
• 153da39: 8351639: Improve debuggability of test/langtools/jdk/jshell/JdiHangingListenExecutionControlTest.java test
• 40a0781: 8075917: The regression-swing case failed as the text on label is not painted red with the GTK L&F
• ... and 28 more: https://git.openjdk.org/jdk21u-dev/compare/76aeaea7f479a3cae0178fe0e8dc1af6006fe5d8...master

Your commit was automatically rebased without conflicts.

[openjdk]

@mrserb Pushed as commit 422784f.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.