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CVE-2026-52797

Gogs: Overwriting critical files results in a denial of service

8.5 HighFix available

Gogs is an open source self-hosted Git service. Prior to 0.14.0, as an authorized user, an intruder can dictate the value which is passed to the git diff command which, together with bypassing the filtering of the passed value, allows the user to bypass the target directory and write the result of the comparison to any arbitrary path. This vulnerability is fixed in 0.14.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
High

Exploit likelihood

0.53%Up 0.5 points since Jun 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.5

Gogs: Overwriting critical files results in a denial of service

Gogs is an open source self-hosted Git service. Prior to 0.14.0, as an authorized user, an intruder can dictate the value which is passed to the git diff command which, together with bypassing the filtering of the passed value, allows the user to bypass the target directory and write the result of the comparison to any arbitrary path. This vulnerability is fixed in 0.14.0.

Record
CVE-2026-52797
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Weakness
CWE-22
Updated
2026-11-02
EUVDEUVD-2026-39085 8.5

Gogs is an open source self-hosted Git service. Prior to 0.14.0, as an authorized user, an intruder can dictate the value which is passed to the git diff command which, together with bypassing the filtering of the passed value, allows the user to bypass the target directory and write the result of the comparison to any arbitrary path. This vulnerability is fixed in 0.14.0.

Record
EUVD-2026-39085
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-pm6v-2h4w-4rp2 8.5

Gogs: Overwriting critical files results in a denial of service

Vulnerability type: Path Traversal Impact: DoS Exploitation prerequisite: authorized user Description: As an authorized user, an intruder can dictate the value which is passed to the git diff command which, together with bypassing the filtering of the passed value, allows the user to bypass the target directory and write the result of the comparison to any arbitrary path. Researcher: Artyom Kulakov (Positive Technologies) Mitigation:

  1. https://github.com/gogs/gogs/blob/b7372b1f32cd0bb40984debfb049e3fc04efaee4/internal/route/repo/editor.go#L307 — on this line, instead of the treePath variable, which comes directly from the user unchanged, we should first filter and then pass the entry variable.
  2. To filter the treePath variable, it is better to use the preexisting pathutil.Clean function instead of path.Clean from the standard Go library.

Exploitation

A Positive Technologies researcher discovered that the user has the ability to preview their changes when editing a file in the repository. The POST /:user/:repo/_preview/:branch/:path_to_file method is responsible for displaying the changes. The problem is how the POST /:user/:repo/_preview/:branch/:path_to_file method processes the value passed to the :path_to_file (see Listing 1).

Listing 1. _preview method processor
func DiffPreviewPost(c *context.Context, f form.EditPreviewDiff) {
	// В treePath попадает значение из :path_to_file
	treePath := c.Repo.TreePath

    // Проверка, что файл существует в репозитории
	entry, err := c.Repo.Commit.TreeEntry(treePath)

	-cut-

	// Значение, полученное от пользователя, передается в функцию в обход фильтра
	diff, err := c.Repo.Repository.GetDiffPreview(c.Repo.BranchName, treePath, f.Content)

	-cut-

The first problem to solve is to make the TreeEntry function think that the value passed in is a file that actually exists in the repository. To do this, we must consider how the TreeEntry function actually makes this decision (see Listing 2).

Listing 2. Path checking and cleaning function
func (t *Tree) TreeEntry(subpath string, opts ...LsTreeOptions) (*TreeEntry, error) {
	
	-cut-
	// Очистка пути от “.” И “/”
	subpath = path.Clean(subpath)
	
	// Разбиение результата на компоненты для их последующей верификации в цикле
	paths := strings.Split(subpath, "/")
	
	-cut-
	
	for i, name := range paths {
		-cut-
	}

Thus, we have a two-level path verification system. At the first stage, extra characters are removed, and at the second stage the resulting path is divided into components, each of which is then checked to be present in the repository. If the TreeEntry function receives a path that has the format of ../../../../../../etc/passwd, it will be transformed into an [.., .., .., .., .., .., etc, passwd] array. The first element of this array will fail further validation and an error will be returned. This problem can be bypassed if the path is directly from the root directory and the corresponding directory hierarchy is present in the repository. A path in the format of /etc/passwd will turn into an [, etc, passwd] array and successfully pass through the filter (see Figure 1).

Figure 1. Example of filter bypass

The resulting value will be passed unchanged to the GetDiffPreview function, which will execute the git diff /etc/passwd command in the current repository (see Listing 3).

Listing 3. Change comparison function
func (repo *Repository) GetDiffPreview(branch, treePath, content string) (diff *gitutil.Diff, err error) {
	-cut-

	cmd := exec.Command("git", "diff", treePath)
	cmd.Dir = localPath
	cmd.Stderr =…
Record
GHSA-pm6v-2h4w-4rp2
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Weakness
CWE-22
Updated
2026-11-02
NVD 8.5

Gogs is an open source self-hosted Git service. Prior to 0.14.0, as an authorized user, an intruder can dictate the value which is passed to the git diff command which, together with bypassing the filtering of the passed value, allows the user to bypass the target directory and write the result of the comparison to any arbitrary path. This vulnerability is fixed in 0.14.0.

Record
CVE-2026-52797
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Weakness
CWE-22
Updated
2026-11-02
OSV 8.5

Gogs: Overwriting critical files results in a denial of service

Gogs is an open source self-hosted Git service. Prior to 0.14.0, as an authorized user, an intruder can dictate the value which is passed to the git diff command which, together with bypassing the filtering of the passed value, allows the user to bypass the target directory and write the result of the comparison to any arbitrary path. This vulnerability is fixed in 0.14.0.

Record
CVE-2026-52797
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Weakness
CWE-22
Updated
2026-11-02
OSVGHSA-pm6v-2h4w-4rp2 8.5

Gogs: Overwriting critical files results in a denial of service

Vulnerability type: Path Traversal Impact: DoS Exploitation prerequisite: authorized user Description: As an authorized user, an intruder can dictate the value which is passed to the git diff command which, together with bypassing the filtering of the passed value, allows the user to bypass the target directory and write the result of the comparison to any arbitrary path. Researcher: Artyom Kulakov (Positive Technologies) Mitigation:

  1. https://github.com/gogs/gogs/blob/b7372b1f32cd0bb40984debfb049e3fc04efaee4/internal/route/repo/editor.go#L307 — on this line, instead of the treePath variable, which comes directly from the user unchanged, we should first filter and then pass the entry variable.
  2. To filter the treePath variable, it is better to use the preexisting pathutil.Clean function instead of path.Clean from the standard Go library.

Exploitation

A Positive Technologies researcher discovered that the user has the ability to preview their changes when editing a file in the repository. The POST /:user/:repo/_preview/:branch/:path_to_file method is responsible for displaying the changes. The problem is how the POST /:user/:repo/_preview/:branch/:path_to_file method processes the value passed to the :path_to_file (see Listing 1).

Listing 1. _preview method processor
func DiffPreviewPost(c *context.Context, f form.EditPreviewDiff) {
	// В treePath попадает значение из :path_to_file
	treePath := c.Repo.TreePath

    // Проверка, что файл существует в репозитории
	entry, err := c.Repo.Commit.TreeEntry(treePath)

	-cut-

	// Значение, полученное от пользователя, передается в функцию в обход фильтра
	diff, err := c.Repo.Repository.GetDiffPreview(c.Repo.BranchName, treePath, f.Content)

	-cut-

The first problem to solve is to make the TreeEntry function think that the value passed in is a file that actually exists in the repository. To do this, we must consider how the TreeEntry function actually makes this decision (see Listing 2).

Listing 2. Path checking and cleaning function
func (t *Tree) TreeEntry(subpath string, opts ...LsTreeOptions) (*TreeEntry, error) {
	
	-cut-
	// Очистка пути от “.” И “/”
	subpath = path.Clean(subpath)
	
	// Разбиение результата на компоненты для их последующей верификации в цикле
	paths := strings.Split(subpath, "/")
	
	-cut-
	
	for i, name := range paths {
		-cut-
	}

Thus, we have a two-level path verification system. At the first stage, extra characters are removed, and at the second stage the resulting path is divided into components, each of which is then checked to be present in the repository. If the TreeEntry function receives a path that has the format of ../../../../../../etc/passwd, it will be transformed into an [.., .., .., .., .., .., etc, passwd] array. The first element of this array will fail further validation and an error will be returned. This problem can be bypassed if the path is directly from the root directory and the corresponding directory hierarchy is present in the repository. A path in the format of /etc/passwd will turn into an [, etc, passwd] array and successfully pass through the filter (see Figure 1).

Figure 1. Example of filter bypass

The resulting value will be passed unchanged to the GetDiffPreview function, which will execute the git diff /etc/passwd command in the current repository (see Listing 3).

Listing 3. Change comparison function
func (repo *Repository) GetDiffPreview(branch, treePath, content string) (diff *gitutil.Diff, err error) {
	-cut-

	cmd := exec.Command("git", "diff", treePath)
	cmd.Dir = localPath
	cmd.Stderr =…
Record
GHSA-pm6v-2h4w-4rp2
CVSS 3.1
8.5 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Weakness
CWE-22
Updated
2026-11-02
OSVGO-2026-5545 No score

Gogs: Overwriting critical files results in a denial of service in gogs.io/gogs

Gogs: Overwriting critical files results in a denial of service in gogs.io/gogs.

NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.

(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)

The additional affected modules and versions are: gogs.io/gogs before v0.14.0.

Record
GO-2026-5545
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
gogs.io/gogs
Go
 through 0.13.4
0.14.0
gogs.io/gogs
Go
 before 0.14.0
0.14.0
gogs.io/gogs
Go
 All versions None known
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-52797 is a high vulnerability (CVSS 8.5) in Gogs, published June 16, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.53%, the 45th percentile. Fixed in gogs.io/gogs 0.14.0.

References

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