fix(deps): update module github.com/go-git/go-git/v5 to v5.19.1 [security]#1091
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ℹ Artifact update noticeFile name: go.modIn order to perform the update(s) described in the table above, Renovate ran the
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This PR contains the following updates:
v5.17.0->v5.19.1GitHub Vulnerability Alerts
CVE-2026-33762
Impact
go-git’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing.This issue only affects Git index format version 4. Earlier formats (
go-gitsupports onlyv2andv3) are not vulnerable to this issue.An attacker able to supply a crafted
.git/indexfile can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition.Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the
.gitdirectory.Patches
Users should upgrade to
v5.17.1, or the latestv6pseudo-version, in order to mitigate this vulnerability.Credit
go-git maintainers thank @kq5y for finding and reporting this issue privately to the
go-gitproject.CVE-2026-34165
Impact
A vulnerability has been identified in which a maliciously crafted
.idxfile can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a Denial of Service (DoS) condition.Exploitation requires write access to the local repository's
.gitdirectory, it order to create or alter existing.idxfiles.Patches
Users should upgrade to
v5.17.1, or the latestv6pseudo-version, in order to mitigate this vulnerability.Credit
The go-git maintainers thank @kq5y for finding and reporting this issue privately to the
go-gitproject.CVE-2026-41506
Impact
go-gitmay leak HTTP authentication credentials when following redirects during smart-HTTP clone and fetch operations.If a remote repository responds to the initial
/info/refsrequest with a redirect to a different host, go-git updates the session endpoint to the redirected location and reuses the original authentication for subsequent requests. This can result in the credentials (e.g. Authorization headers) being sent to an unintended host.An attacker controlling or influencing the redirect target can capture these credentials and potentially reuse them to access the victim’s repositories or other resources, depending on the scope of the credential.
Clients using
go-gitexclusively with trusted remotes (for example, GitHub or GitLab), and over a secure HTTPS connection, are not affected by this issue. The risk arises when interacting with untrusted or misconfigured Git servers, or when using unsecured HTTP connections, which is not recommended. Such configurations also expose clients to a broader class of security risks beyond this issue, including credential interception and tampering of repository data.Patches
Users should upgrade to
v5.18.0, orv6.0.0-alpha.2, in order to mitigate this vulnerability. Versions prior to v5 are likely to be affected, users are recommended to upgrade to a supportedgo-gitversion.The patched versions add support for configuring followRedirects. In line with upstream behaviour, the default is now
initial, while users can opt intoFollowRedirectsorNoFollowRedirectsprogrammatically.Credit
Thanks to the 3 separate reports from @celinke97, @N0zoM1z0 and @AyushParkara. Thanks for finding and reporting this issue privately to the
go-gitproject. 🙇CVE-2026-45022
Impact
go-gitmay parse malformed Git objects in a way that differs from upstream Git. Whencommitortagobjects contain ambiguous or malformed headers,go-git’s decoded representation may expose values differently from how Git itself would interpret or reject the same object.Additionally,
go-git’s commit signing and verification logic operates over commit data reconstructed fromgo-git’s parsed representation rather than the original raw object bytes. As a result,go-gitmay sign or verify a commit payload that is not byte-for-byte equivalent to the object stored in the repository.This can cause a signature to appear valid for a commit whose displayed or effective metadata differs from the object that was intended to be signed.
Patches
Users should upgrade to a patched version in order to mitigate this vulnerability. Versions prior to v5 are likely to be affected, users are recommended to upgrade to a supported
go-gitversion.Credit
Thanks to @bugbunny-research (https://bugbunny.ai/) for reporting this to
sigstore/gitsign, and to @wlynch, @patzielinski and @adityasaky for coordinating the disclosure with thego-gitproject. 🙇 🥇Thanks to @wayphinder for reporting this to the
go-gitproject. 🙇CVE-2026-45570
Impact
go-git's SSH transport constructs the remote exec command by wrapping the repository path in single quotes without escaping single quotes embedded inside the path. This diverges from canonical Git, which shell-quotes the path throughsq_quote_bufso that an embedded'becomes the'\''close-escape-reopen sequence and the whole path round-trips as a single quoted argument.A repository path containing a single quote can therefore break out of the quoted region in the exec command and be appended as additional shell tokens. On SSH servers that evaluate the exec command through a shell (for example a user account whose login shell is
/bin/shor/bin/bash, or aForceCommandwrapper that re-evaluates$SSH_ORIGINAL_COMMAND), those additional tokens execute in that account's command-execution context. SSH servers that tokenize the exec command without shell evaluation, including the canonicalgit-shellsetup, are not affected.The vulnerable behaviour is on the SSH server side, not in
go-git: the same bytes can be produced by any SSH client. The change ingo-gitis defense-in-depth that restores parity with canonical Git's wire format and preventsgo-gitfrom being a vehicle for reaching shell-evaluating servers through attacker-influenced repository paths.Patches
Users should upgrade to a patched version in order to mitigate this issue. The fix ports
sq_quote_buffrom canonical Git intogo-git's SSH transport so that the wire output is byte-identical to whatgititself would send for the same input.Versions prior to
v5are likely to be affected, users are recommended to upgrade to a supported go-git version.Credit
Thanks to @N0zoM1z0 for reporting this to the
go-gitproject. 🙇CVE-2026-45571
Impact
A path validation issue in
go-gitcould allow crafted repository data to affect files outside the intended checkout target, including the repository's.gitdirectory.These validations were introduced in upstream Git years ago, so the vulnerability arose from go-git drifting from those checks. Some attack vectors were platform-specific: certain payloads affected only Windows users, others affected only macOS users, and some applied across all supported platforms.
Using non-descendant
go-billyfilesystem instances, or different filesystem types, for theStorerandWorktreemay provide some isolation against.gitdirectory manipulation. For example, users that store the.gitdirectory throughmemfswhile usingosfsfor the worktree are not affected by this vulnerability in the main repository, because repository metadata is not materialized inside the worktree filesystem.However, this isolation does not necessarily apply when the repository contains submodules, since submodule dotgit directories may still be represented or materialized within the worktree context.
It is important to note that exploitation requires a maliciously crafted repository payload. Users should always exercise caution when interacting with repositories or Git servers they do not trust.
Patches
Users should upgrade to a patched version in order to mitigate this vulnerability. Versions prior to
v5are likely to be affected, users are recommended to upgrade to a supported go-git version.Credits
Thanks to @kodareef5, @AyushParkara and @N0zoM1z0 for reporting this to the go-git project in three separate reports. 🙇
GHSA-w5pp-99ch-qj29
Impact
Several denial-of-service issues were identified in
go-gitwhen parsing maliciously crafted Git repository data.An attacker may craft a malicious
.pack,.idxor loose objects that causes an application using an affected version ofgo-gitto panic or consume excessive resources.This can lead to denial of service in applications that use
go-gitto clone, fetch, open, or otherwise process untrusted repositories or Git object data.Exploitation requires the ability to alter read-only files such as
.packor.idxfrom the local repository's.git/objects/pack/directory. Alternatively, the user would need to be interacting with a malicious remote server, which is not recommended and exposes users to a broader class of security risks beyond this issue.Patches
Users should upgrade to a patched version in order to mitigate this vulnerability. Versions prior to
v5are likely to be affected, users are recommended to upgrade to a supportedgo-gitversion.Credits
go-git thanks @kodareef5, @AyushParkara and @N0zoM1z0 for reporting this in four separate reports. 🙇
Release Notes
go-git/go-git (github.com/go-git/go-git/v5)
v5.19.1Compare Source
What's Changed
worktreeFilesystemwrapper for worktree and hardening by @hiddeco in #2100Full Changelog: go-git/go-git@v5.19.0...v5.19.1
v5.19.0Compare Source
What's Changed
Full Changelog: go-git/go-git@v5.18.0...v5.19.0
v5.18.0Compare Source
What's Changed
Full Changelog: go-git/go-git@v5.17.2...v5.18.0
v5.17.2Compare Source
What's Changed
v5.17.1. Thanks @pskrbasu for reporting it. 🙇Full Changelog: go-git/go-git@v5.17.1...v5.17.2
v5.17.1Compare Source
What's Changed
Full Changelog: go-git/go-git@v5.17.0...v5.17.1
Configuration
📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).
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♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.
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