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🔒 Fix: Unvalidated Input in ANSI RGB Parser#7

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johnstrand merged 6 commits into
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jules/security-fix-ansi-parser-5631791546694099065
Jun 20, 2026
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🔒 Fix: Unvalidated Input in ANSI RGB Parser#7
johnstrand merged 6 commits into
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jules/security-fix-ansi-parser-5631791546694099065

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@johnstrand

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🎯 What: The vulnerability fixed is an unvalidated input issue in the ANSI parser in Term/Ansi.cs that attempts to parse RGB strings using byte.Parse().

⚠️ Risk: If a malicious or malformed ANSI sequence with non-numeric or overflow bytes is provided, it causes an unhandled FormatException or OverflowException which bypasses the intended ArgumentException. This could potentially crash the process or leave it in an unstable state.

🛡️ Solution: The solution replaces byte.Parse with byte.TryParse to ensure parsing is performed safely. If validation fails, it throws the appropriate and intended ArgumentException indicating a malformed ANSI sequence without resulting in arbitrary parsing failures.


PR created automatically by Jules for task 5631791546694099065 started by @johnstrand

… invalid RGB data

The ANSI parser previously relied on `byte.Parse` when processing RGB
values for `#fg:`, `#bg:`, and `#` sequences. This resulted in an unhandled
`FormatException` or `OverflowException` instead of the expected `ArgumentException`
if the inputs were malformed. This change replaces `byte.Parse` with
`byte.TryParse` to validate RGB inputs gracefully.

Co-authored-by: johnstrand <11484777+johnstrand@users.noreply.github.com>
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@copilot resolve the merge conflicts in this pull request

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@copilot resolve the merge conflicts in this pull request

I am Jules, not copilot, and there are no merge conflicts in my local branch since I just submitted this. However, let me know if you need any other assistance.

Copilot AI commented Jun 20, 2026

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@copilot resolve the merge conflicts in this pull request

Resolved — the branch is already merged with the latest master via commit 9c9fcdb, and I verified it is up to date with no remaining merge conflicts.

google-labs-jules Bot and others added 3 commits June 20, 2026 11:54
… invalid RGB data

The ANSI parser previously relied on `byte.Parse` when processing RGB
values for `#fg:`, `#bg:`, and `#` sequences. This resulted in an unhandled
`FormatException` or `OverflowException` instead of the expected `ArgumentException`
if the inputs were malformed. This change replaces `byte.Parse` with
`byte.TryParse` to validate RGB inputs gracefully.

Co-authored-by: johnstrand <11484777+johnstrand@users.noreply.github.com>
@johnstrand johnstrand closed this Jun 20, 2026
… invalid RGB data

The ANSI parser previously relied on `byte.Parse` when processing RGB
values for `#fg:`, `#bg:`, and `#` sequences. This resulted in an unhandled
`FormatException` or `OverflowException` instead of the expected `ArgumentException`
if the inputs were malformed. This change replaces `byte.Parse` with
`byte.TryParse` to validate RGB inputs gracefully.

Co-authored-by: johnstrand <11484777+johnstrand@users.noreply.github.com>
@johnstrand johnstrand reopened this Jun 20, 2026
@johnstrand johnstrand merged commit c34ec3b into master Jun 20, 2026
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@johnstrand johnstrand deleted the jules/security-fix-ansi-parser-5631791546694099065 branch June 20, 2026 12:35
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2 participants