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No exploitation reportedFix available

CVE-2026-33176

No exploitation reported by the sources we read.

  • Published2026-03-24
  • Fixed in8.1.2.1 · 8.0.4.1 · 7.2.3.1
  • WeaknessCWE-400 · CWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Timeline

dates in UTC
  1. 2026-03-2400:16CVE publishedNVD

Versions per branch

NVD · OSV
Ruby on Rails
BranchAffectedFixed in
8.1≥ 8.1.0, < 8.1.2.18.1.2.1
8.1≥ 8.1.0.beta1, < 8.1.2.18.1.2.1
8.0≥ 8.0.0, < 8.0.4.18.0.4.1
8.0≥ 8.0.0.beta1, < 8.0.4.18.0.4.1
7.2< 7.2.3.17.2.3.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • rails activesupport
    Affected
    • = >= 8.1.0.beta1, < 8.1.2.1no fix stated
    • = >= 8.0.0.beta1, < 8.0.4.1no fix stated
    • = < 7.2.3.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-23

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • candlepinRed Hat:satellite:6.17::el9all versions · fixed in 0:4.4.25-1.el9satand 1 other package
  • candlepinRed Hat:satellite:6.16::el9all versions · fixed in 0:4.4.25-1.el9satand 1 other package
  • candlepinRed Hat:satellite:6.16::el8all versions · fixed in 0:4.4.25-1.el8satand 1 other package
  • cinc-auditorWolfiall versions · fixed in 7.0.107-r1
  • cinc-auditorChainguardall versions · fixed in 7.0.107-r1
  • gitlab-rails-ce-18.1Chainguardall versions · no fixed version listedand 12 other packages
  • gitlab-rails-ce-18.10Chainguardall versions · fixed in 18.10.3-r1
  • gitlab-rails-ce-18.8Chainguardall versions · fixed in 18.8.11-r4

53 more package ranges on OSV.dev

Vendor advisories

  • RHSA-2026:14874 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Satellite 6.16.8 Async Update

  • RHSA-2026:14873 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Satellite 6.17.8 Async Update

  • RHSA-2026:14835 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Satellite 6.18.5 Async Update

Full record on NVD

Fix

  1. Update Ruby on Rails to 8.1.2.1 · 8.0.4.1 · 7.2.3.1
  2. Vendor fix Red Hat Product Security RHSA-2026:14874 · 8 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For detailed instructions how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_satellite/6.16/html/updating_red_hat_satellite/index
  3. Vendor fix Red Hat Product Security RHSA-2026:14873 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For detailed instructions how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_satellite/6.17/html/updating_red_hat_satellite/index
  4. Vendor fix Red Hat Product Security RHSA-2026:14835 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For detailed instructions how to apply this update, refer to: https://access.redhat.com/documentation/en-us/red_hat_satellite/6.18/html/updating_red_hat_satellite/index
  5. Workaround from the vendor Red Hat Product Security RHSA-2026:14874 · 134 productsTo mitigate this issue, applications that use Active Support number helpers to process untrusted input should implement strict input validation. This involves sanitizing or restricting the format and length of numerical strings before they are passed to Active Support, thereby preventing the `BigDe…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-03-24
  • CNACVSS 4.06.6known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-400, CWE-770known since 2026-10-23
  • FIRST EPSSEPSS score0.9 %2026-11-09
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-03-23

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-03-24
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-2j26-frm8-cmj9

Frequently asked questions

What is CVE-2026-33176?

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Is CVE-2026-33176 actively exploited?

Active exploitation of CVE-2026-33176 has not been confirmed. Its EPSS score was 0.9% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-33176?

CVE-2026-33176 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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