What’s Vulnerable › Vulnerabilities

CVE-2021-27919

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-11 · updated 2026-06-17

Description

archive/zip in Go 1.16.x before 1.16.1 allows attackers to cause a denial of service (panic) upon attempted use of the Reader.Open API for a ZIP archive in which ../ occurs at the beginning of any filename.

Affected products

• Fedoraproject Fedora: 34, 35
• Go: from 1.16.0 before 1.16.1 — fixed in 1.16.1

How to fix

Upgrade to a fixed version: Go 1.16.1. Check the vendor advisory for mitigations.

References

• https://groups.google.com/g/golang-announce/c/MfiLYjG-RAw
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MU47VKTNXX33ZDLTI2ORRUY3KLJKU6G/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HM7U5JNS5WU66Q3S26PFIU2ITB2ATTQ4/
• https://security.gentoo.org/glsa/202208-02
• https://groups.google.com/g/golang-announce/c/MfiLYjG-RAw
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MU47VKTNXX33ZDLTI2ORRUY3KLJKU6G/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HM7U5JNS5WU66Q3S26PFIU2ITB2ATTQ4/
• https://security.gentoo.org/glsa/202208-02

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