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CVE-2026-39817

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

Published: May 7, 2026Updated: May 13, 2026 Sources: CVE List NVD BDUCWE-787
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.2%
Top 93.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:RS:CC:NI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-787

Affected Products

GoThe Go ProjectOSS Libraries
cmd/goGo toolchain
Library
OSS Libraries / go
gogolangOSS Libraries
the go projectoss-projectOSS Librariesaka go, golang-google-protobuf, crypto
go toolchainoss-projectUSOSS Librariesaka golang, go compiler toolchain, cmd/go
golangoss-projectUSOSS Libraries

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://go.dev/cl/767520
go.dev
https://go.dev/issue/78778
go.dev
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
groups.google.com
and 1 more references View all →

Timeline

Published
May 7, 2026
Last Updated
May 13, 2026

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