critical
CVE-2020-8165
rubygem-activesupport: potentially unintended unmarshalling of user-provided objects in MemCacheStore and RedisCacheStore
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GHSA9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD, GHSA, Ruby Advisory DB. Rated lower by Red Hat (high).
Description
A deserialization of untrusted data vulnernerability exists in rails < 5.2.4.3, rails < 6.0.3.1 that can allow an attacker to unmarshal user-provided objects in MemCacheStore and RedisCacheStore potentially resulting in an RCE.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| rubygems::GitHub Security Advisory RubyGems | activesupport | 5.2.4.3, 6.0.3.1 |
| rubygems::Ruby Advisory Database | activesupport | ~> 5.2.4, >= 5.2.4.3, >= 6.0.3.1 |
| debian 10 | rails | 2:5.2.2.1+dfsg-1+deb10u2 |
| debian 11 | rails | 2:5.2.4.3+dfsg-1 |
| debian 12 | rails | 2:5.2.4.3+dfsg-1 |
| debian 13 | rails | 2:5.2.4.3+dfsg-1 |
| debian 14 | rails | 2:5.2.4.3+dfsg-1 |
| debian 8 | rails | 2:4.1.8-1+deb8u7 |
| debian 9 | rails | 2:4.2.7.1-1+deb9u3 |
| echo | rails | 2:5.2.4.3+dfsg-1 |
| Red Hat | cfme-gemset, rubygem-activesupport, rubygem-activesupport-doc | no fix listed |
Show all 13 entries from 11 sources
| Source | Package | Fixed in |
|---|---|---|
| rubygems::GitHub Security Advisory RubyGems | activesupport | 5.2.4.3, 6.0.3.1 |
| rubygems::Ruby Advisory Database | activesupport | ~> 5.2.4, >= 5.2.4.3, >= 6.0.3.1 |
| debian 10 | rails | 2:5.2.2.1+dfsg-1+deb10u2 |
| debian 11 | rails | 2:5.2.4.3+dfsg-1 |
| debian 12 | rails | 2:5.2.4.3+dfsg-1 |
| debian 13 | rails | 2:5.2.4.3+dfsg-1 |
| debian 14 | rails | 2:5.2.4.3+dfsg-1 |
| debian 8 | rails | 2:4.1.8-1+deb8u7 |
| debian 9 | rails | 2:4.2.7.1-1+deb9u3 |
| echo | rails | 2:5.2.4.3+dfsg-1 |
| Red Hat | cfme-gemset | no fix listed |
| Red Hat | rubygem-activesupport | no fix listed |
| Red Hat | rubygem-activesupport-doc | no fix listed |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00031.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00034.html
- https://access.redhat.com/security/cve/CVE-2020-8165
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2020-8165.yml
- https://groups.google.com/forum/#!msg/rubyonrails-security/bv6fW4S0Y1c/KnkEqM7AAQAJ
- https://groups.google.com/forum/#!topic/rubyonrails-security/bv6fW4S0Y1c
- https://groups.google.com/g/rubyonrails-security/c/bv6fW4S0Y1c
- https://hackerone.com/reports/413388
All 17 references
- https://lists.debian.org/debian-lts-announce/2020/06/msg00022.html
- https://lists.debian.org/debian-lts-announce/2020/07/msg00013.html
- https://nvd.nist.gov/vuln/detail/CVE-2020-8165
- https://security.netapp.com/advisory/ntap-20250509-0002
- https://security.netapp.com/advisory/ntap-20250509-0002/
- https://weblog.rubyonrails.org/2020/5/18/Rails-5-2-4-3-and-6-0-3-1-have-been-released
- https://weblog.rubyonrails.org/2020/5/18/Rails-5-2-4-3-and-6-0-3-1-have-been-released/
- https://www.cve.org/CVERecord?id=CVE-2020-8165
- https://www.debian.org/security/2020/dsa-4766