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Vulnerability Details :

CVE-2026-39819

Assigner-Go

Assigner Org ID-1bb62c36-49e3-4200-9d77-64a1400537cc

Published At-07 May, 2026 | 19:41

Updated At-08 May, 2026 | 21:29

Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go

The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.

EPSS History

Score

Latest Score

N/A

Percentile

Latest Percentile

N/A

▼Common Vulnerabilities and Exposures (CVE)

cve.org

Assigner:Go

Assigner Org ID:1bb62c36-49e3-4200-9d77-64a1400537cc

Published At:07 May, 2026 | 19:41

Updated At:08 May, 2026 | 21:29

▼CVE Numbering Authority (CNA)

Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go

Affected Products

Vendor

Go toolchain

Product

cmd/go

Collection URL

https://pkg.go.dev

Package Name

cmd/go

Default Status

unaffected

Versions

Affected

From 0 before 1.25.10 (semver)
From 1.26.0-0 before 1.26.3 (semver)

Problem Types

Type	CWE ID	Description
N/A	N/A	CWE-377: Insecure Temporary File

Type: N/A

CWE ID: N/A

Description: CWE-377: Insecure Temporary File

Credits

Harshit Gupta (Mr HAX)

References

Hyperlink	Resource
https://go.dev/issue/78584	N/A
https://go.dev/cl/763882	N/A
https://groups.google.com/g/golang-announce/c/qcCIEXso47M	N/A
https://pkg.go.dev/vuln/GO-2026-4978	N/A

Hyperlink: https://go.dev/issue/78584

Resource: N/A

Hyperlink: https://go.dev/cl/763882

Resource: N/A

Hyperlink: https://groups.google.com/g/golang-announce/c/qcCIEXso47M

Resource: N/A

Hyperlink: https://pkg.go.dev/vuln/GO-2026-4978

Resource: N/A

▼Authorized Data Publishers (ADP)

CISA ADP Vulnrichment

Metrics

Version	Base score	Base severity	Vector
3.1	5.3	MEDIUM	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

Version: 3.1

Base score: 5.3

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

Metrics Other Info

▼National Vulnerability Database (NVD)

nvd.nist.gov

Source:security@golang.org

Published At:07 May, 2026 | 20:16

Updated At:08 May, 2026 | 22:16

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	5.3	MEDIUM	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

Type: Secondary

Version: 3.1

Base score: 5.3

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N

References

Hyperlink	Source	Resource
https://go.dev/cl/763882	security@golang.org	N/A
https://go.dev/issue/78584	security@golang.org	N/A
https://groups.google.com/g/golang-announce/c/qcCIEXso47M	security@golang.org	N/A
https://pkg.go.dev/vuln/GO-2026-4978	security@golang.org	N/A

Hyperlink: https://go.dev/cl/763882

Source: security@golang.org

Resource: N/A

Hyperlink: https://go.dev/issue/78584

Source: security@golang.org

Resource: N/A

Hyperlink: https://groups.google.com/g/golang-announce/c/qcCIEXso47M

Source: security@golang.org

Resource: N/A

Hyperlink: https://pkg.go.dev/vuln/GO-2026-4978

Source: security@golang.org

Resource: N/A

CVE-2026-39819

Credits

Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go

Vendors

Products

Metrics (CVSS)

Weaknesses

Attack Patterns

Solution/Workaround

References

EPSS History

Score

Latest Score

N/A

Percentile

Latest Percentile

N/A

Stakeholder-Specific Vulnerability Categorization (SSVC)

Affected Products

Affected

Problem Types

Metrics

Metrics Other Info

Impacts

Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

Rejected Reason

References

Affected Products

Metrics

Metrics Other Info

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Solutions

Configurations

Workarounds

Exploits

Credits

Timeline

Replaced By

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References

CISA Catalog

Metrics

CPE Matches

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References

Change History

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