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Vulnerability Details :

CVE-2026-39817

Summary
Assigner-Go
Assigner Org ID-1bb62c36-49e3-4200-9d77-64a1400537cc
Published At-07 May, 2026 | 19:41
Updated At-08 May, 2026 | 21:29
Rejected At-
Credits

Invoking "go tool pack" does not sanitize output paths in cmd/go

The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼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
Rejected At:
▼CVE Numbering Authority (CNA)
Invoking "go tool pack" does not sanitize output paths in cmd/go

The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.

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
TypeCWE IDDescription
N/AN/ACWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Type: N/A
CWE ID: N/A
Description: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Harshit Gupta (Mr HAX)
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://go.dev/issue/78778
N/A
https://go.dev/cl/767520
N/A
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
N/A
https://pkg.go.dev/vuln/GO-2026-4979
N/A
Hyperlink: https://go.dev/issue/78778
Resource: N/A
Hyperlink: https://go.dev/cl/767520
Resource: N/A
Hyperlink: https://groups.google.com/g/golang-announce/c/qcCIEXso47M
Resource: N/A
Hyperlink: https://pkg.go.dev/vuln/GO-2026-4979
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.15.9MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Version: 3.1
Base score: 5.9
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼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

The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.15.9MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 5.9
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
CPE Matches
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://go.dev/cl/767520security@golang.org
N/A
https://go.dev/issue/78778security@golang.org
N/A
https://groups.google.com/g/golang-announce/c/qcCIEXso47Msecurity@golang.org
N/A
https://pkg.go.dev/vuln/GO-2026-4979security@golang.org
N/A
Hyperlink: https://go.dev/cl/767520
Source: security@golang.org
Resource: N/A
Hyperlink: https://go.dev/issue/78778
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-2026-4979
Source: security@golang.org
Resource: N/A

Change History

0
Information is not available yet

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