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CVE

CVE-2026-33176

Rails Active Support has a possible DoS vulnerability in its number helpers
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CVE

CVE-2026-33176

Rails Active Support has a possible DoS vulnerability in its number helpers

Impact

Active Support number helpers accept strings containing scientific notation (e.g. 1e10000), which when converted to a string could be expanded 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.

Releases

The fixed releases are available at the normal locations.

Credit

This issue was responsibly reported by Hackerone researcher manun.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
6.6
-
4.0
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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/rails/rails/security/advisories/GHSA-2j26-frm8-cmj9, https://nvd.nist.gov/vuln/detail/CVE-2026-33176, https://github.com/rails/rails/commit/19dbab51ca086a657bb86458042bc44314916bcb, https://github.com/rails/rails/commit/ebd6be18120d1136511eb516338e27af25ac0a1a, https://github.com/rails/rails/commit/ee2c59e730e5b8faed502cd2c573109df093f856, https://github.com/rails/rails, https://github.com/rails/rails/releases/tag/v7.2.3.1, https://github.com/rails/rails/releases/tag/v8.0.4.1, https://github.com/rails/rails/releases/tag/v8.1.2.1, https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2026-33176.yml

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.0003%
EPSS Percentile
0.09253%
Introduced Version
8.1.0.beta1,8.0.0.beta1,0
Fix Available
8.1.2.1,8.0.4.1,7.2.3.1,7.0.107-r1,18.10.3-r1,18.9.5-r0,18.10.3-r0,1.18.2-r60,6.4.0-r9,8.1.3-r0,8.0.5-r0

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