High severityNVD Advisory· Published Jan 1, 2022· Updated May 22, 2025
CVE-2021-41819
CVE-2021-41819
Description
CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
cgiRubyGems | >= 0.3.0, < 0.3.1 | 0.3.1 |
cgiRubyGems | >= 0.2.0, < 0.2.1 | 0.2.1 |
cgiRubyGems | < 0.1.0.1 | 0.1.0.1 |
Affected products
53- Ruby/CGI::Cookie.parsedescription
- osv-coords52 versionspkg:bitnami/rubypkg:bitnami/ruby-minpkg:gem/cgipkg:rpm/almalinux/rubypkg:rpm/almalinux/ruby-default-gemspkg:rpm/almalinux/ruby-develpkg:rpm/almalinux/ruby-docpkg:rpm/almalinux/rubygem-abrtpkg:rpm/almalinux/rubygem-abrt-docpkg:rpm/almalinux/rubygem-bigdecimalpkg:rpm/almalinux/rubygem-bsonpkg:rpm/almalinux/rubygem-bson-docpkg:rpm/almalinux/rubygem-bundlerpkg:rpm/almalinux/rubygem-bundler-docpkg:rpm/almalinux/rubygem-did_you_meanpkg:rpm/almalinux/rubygem-io-consolepkg:rpm/almalinux/rubygem-irbpkg:rpm/almalinux/rubygem-jsonpkg:rpm/almalinux/rubygem-minitestpkg:rpm/almalinux/rubygem-mongopkg:rpm/almalinux/rubygem-mongo-docpkg:rpm/almalinux/rubygem-mysql2pkg:rpm/almalinux/rubygem-mysql2-docpkg:rpm/almalinux/rubygem-net-telnetpkg:rpm/almalinux/rubygem-opensslpkg:rpm/almalinux/rubygem-pgpkg:rpm/almalinux/rubygem-pg-docpkg:rpm/almalinux/rubygem-power_assertpkg:rpm/almalinux/rubygem-psychpkg:rpm/almalinux/rubygem-rakepkg:rpm/almalinux/rubygem-rbspkg:rpm/almalinux/rubygem-rdocpkg:rpm/almalinux/rubygem-rexmlpkg:rpm/almalinux/rubygem-rsspkg:rpm/almalinux/rubygemspkg:rpm/almalinux/rubygems-develpkg:rpm/almalinux/rubygem-test-unitpkg:rpm/almalinux/rubygem-typeprofpkg:rpm/almalinux/rubygem-xmlrpcpkg:rpm/almalinux/ruby-irbpkg:rpm/almalinux/ruby-libspkg:rpm/opensuse/ruby2.5&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/ruby2.5&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/ruby2.7&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ruby3.0&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ruby3.1&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ruby3.2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ruby3.3&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ruby3.4&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/ruby4.0&distro=openSUSE%20Tumbleweedpkg:rpm/suse/ruby2.5&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/ruby2.5&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4
< 2.6.9+ 51 more
- (no CPE)range: < 2.6.9
- (no CPE)range: < 2.6.9
- (no CPE)range: >= 0.3.0, < 0.3.1
- (no CPE)range: < 2.6.9-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 2.7.6-138.module_el8.6.0+3263+904da987
- (no CPE)range: < 2.6.9-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 2.6.9-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 0.3.0-4.module_el8.5.0+259+8cec6917
- (no CPE)range: < 0.3.0-4.module_el8.5.0+259+8cec6917
- (no CPE)range: < 1.4.1-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 4.5.0-1.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 4.5.0-1.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 1.17.2-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 1.16.1-4.module_el8.5.0+2625+ec418553
- (no CPE)range: < 1.3.0-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 0.4.7-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 1.0.0-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 2.1.0-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 5.11.3-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 2.8.0-1.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 2.8.0-1.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 0.5.2-1.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 0.5.2-1.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 0.2.0-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 2.1.2-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 1.1.4-1.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 1.1.4-1.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 1.1.3-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 3.1.0-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 12.3.3-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 1.4.0-141.module_el8.6.0+3263+41cde0c0
- (no CPE)range: < 6.1.2.1-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 3.2.5-141.module_el8.6.0+3263+41cde0c0
- (no CPE)range: < 0.2.9-141.module_el8.6.0+3263+41cde0c0
- (no CPE)range: < 3.0.3.1-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 3.0.3.1-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 3.2.9-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 0.15.2-141.module_el8.6.0+3263+41cde0c0
- (no CPE)range: < 0.3.0-108.module_el8.5.0+250+ba22dbf7
- (no CPE)range: < 2.5.9-110.module_el8.6.0+3074+4b08f9d4
- (no CPE)range: < 2.6.9-108.module_el8.5.0+2623+08a8ba32
- (no CPE)range: < 2.5.9-150000.4.26.1
- (no CPE)range: < 2.5.9-150000.4.26.1
- (no CPE)range: < 2.7.5-1.1
- (no CPE)range: < 3.0.3-1.1
- (no CPE)range: < 3.1.0-1.1
- (no CPE)range: < 3.2.1-1.1
- (no CPE)range: < 3.3.0-1.2
- (no CPE)range: < 3.4.1-1.1
- (no CPE)range: < 4.0.0~preview2-1.1
- (no CPE)range: < 2.5.9-150000.4.26.1
- (no CPE)range: < 2.5.9-150000.4.26.1
Patches
Vulnerability mechanics
References
15- github.com/advisories/GHSA-4vf4-qmvg-mh7hghsaADVISORY
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/mitrevendor-advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/mitrevendor-advisory
- nvd.nist.gov/vuln/detail/CVE-2021-41819ghsaADVISORY
- security.gentoo.org/glsa/202401-27ghsavendor-advisoryWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2021-41819.ymlghsaWEB
- hackerone.com/reports/910552ghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWNghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZFghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWNghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZFghsaWEB
- security.netapp.com/advisory/ntap-20220121-0003ghsaWEB
- www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819ghsaWEB
- security.netapp.com/advisory/ntap-20220121-0003/mitre
- www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/mitre
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