Medium severity5.3NVD Advisory· Published Mar 24, 2026· Updated Jun 17, 2026
CVE-2026-33169
CVE-2026-33169
Description
Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. NumberToDelimitedConverter uses a lookahead-based regular expression with gsub! to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and gsub! can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
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 |
|---|---|---|
activesupportRubyGems | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
activesupportRubyGems | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
activesupportRubyGems | < 7.2.3.1 | 7.2.3.1 |
Affected products
18- osv-coords16 versionspkg:apk/chainguard/cinc-auditorpkg:apk/chainguard/gitlab-rails-ce-18.10pkg:apk/chainguard/gitlab-rails-ce-18.8pkg:apk/chainguard/gitlab-rails-ce-18.9pkg:apk/chainguard/gitlab-rails-ce-fips-18.10pkg:apk/chainguard/gitlab-rails-ce-fips-18.9pkg:apk/chainguard/kube-fluentd-operatorpkg:apk/chainguard/kube-logging-operator-fluentd-outputspkg:apk/chainguard/ruby3.2-rails-8.1pkg:apk/chainguard/ruby3.4-rails-8.0pkg:apk/wolfi/cinc-auditorpkg:apk/wolfi/kube-fluentd-operatorpkg:apk/wolfi/kube-logging-operator-fluentd-outputspkg:apk/wolfi/ruby3.2-rails-8.1pkg:apk/wolfi/ruby3.4-rails-8.0pkg:gem/activesupport
< 7.0.107-r1+ 15 more
- (no CPE)range: < 7.0.107-r1
- (no CPE)range: < 18.10.3-r1
- (no CPE)range: < 18.8.11-r4
- (no CPE)range: < 18.9.5-r0
- (no CPE)range: < 18.10.3-r0
- (no CPE)range: < 18.9.5-r0
- (no CPE)range: < 1.18.2-r60
- (no CPE)range: < 6.4.0-r9
- (no CPE)range: < 8.1.3-r0
- (no CPE)range: < 8.0.5-r0
- (no CPE)range: < 7.0.107-r1
- (no CPE)range: < 1.18.2-r60
- (no CPE)range: < 6.4.0-r9
- (no CPE)range: < 8.1.3-r0
- (no CPE)range: < 8.0.5-r0
- (no CPE)range: >= 8.1.0.beta1, < 8.1.2.1
- Range: >= 8.1.0.beta1, < 8.1.2.1
Patches
Vulnerability mechanics
References
10- github.com/rails/rails/commit/29154f1097da13d48fdb3200760b3e3da66dcb11nvdPatchWEB
- github.com/rails/rails/commit/b54a4b373c6f042cab6ee2033246b1c9ecc38974nvdPatchWEB
- github.com/rails/rails/commit/ec1a0e215efd27a3b3911aae6df978a80f456a49nvdPatchWEB
- github.com/advisories/GHSA-cg4j-q9v8-6v38ghsaADVISORY
- github.com/rails/rails/security/advisories/GHSA-cg4j-q9v8-6v38nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-33169ghsaADVISORY
- github.com/rails/rails/releases/tag/v7.2.3.1nvdRelease NotesWEB
- github.com/rails/rails/releases/tag/v8.0.4.1nvdRelease NotesWEB
- github.com/rails/rails/releases/tag/v8.1.2.1nvdRelease NotesWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33169.ymlghsaWEB
News mentions
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