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CVE-2024-47889

Action Mailer has possible ReDoS vulnerability in block_format

MEDIUM
6.6
CVSS Score
Published: October 16, 2024 at 08:55 PM UTC
Updated: June 17, 2026 at 07:57 AM UTC
2 products affected across 2 vendorsRailsRails

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Severity
MEDIUM6.6
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

Action Mailer is a framework for designing email service layers. Starting in version 3.0.0 and prior to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, and 7.2.1.1, there is a possible ReDoS vulnerability in the block_format helper in Action Mailer. Carefully crafted text can cause the block_format helper to take an unexpected amount of time, possibly resulting in a DoS vulnerability. All users running an affected release should either upgrade to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, or 7.2.1.1 or apply the relevant patch immediately. As a workaround, users can avoid calling the `block_format` helper or upgrade to Ruby 3.2. Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected. Rails 8.0.0.beta1 requires Ruby 3.2 or greater so is unaffected.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rails· Rails
60%
v < 6.1.7.9v < 7.0.8.5v < 7.1.4.1v < 7.2.1.1
Affected range stops below 6.1.7.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.8.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.1.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.2.1.1, so it looks safe — our inference, not a vendor statement
Rails· Rubyonrails
60%
3.0.0 ≤ v < 6.1.7.97.0.0 ≤ v < 7.0.8.57.1.0 ≤ v < 7.1.4.17.2.0 ≤ v < 7.2.1.13.0.07.0.07.1.07.2.0
Affected range stops below 6.1.7.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.8.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.1.4.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.2.1.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

x_refsource_MISC
Source: [email protected]
https://github.com/rails/rails/commit/0e5694f4d32544532d2301a9b4084eacb6986e94
x_refsource_MISC
Source: [email protected]
https://github.com/rails/rails/commit/3612e3eb3fbafed4f85e1c6ea4c7b6addbb0fdd3
x_refsource_MISC
Source: [email protected]
https://github.com/rails/rails/commit/985f1923fa62806ff676e41de67c3b4552131ab9
x_refsource_MISC
Source: [email protected]
https://github.com/rails/rails/commit/be898cc996986decfe238341d96b2a6573b8fd2e
x_refsource_CONFIRM
Source: [email protected]
https://github.com/rails/rails/security/advisories/GHSA-h47h-mwp9-c6q6

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.6MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-1333

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