How severe is GHSA-h47h-mwp9-c6q6?

No CVSS score has been assigned to GHSA-h47h-mwp9-c6q6 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-h47h-mwp9-c6q6?

GHSA-h47h-mwp9-c6q6 affects the following packages: actionmailer (RubyGems), actionmailer (RubyGems), actionmailer (RubyGems), actionmailer (RubyGems). Ecosystems affected: RubyGems.

How do I fix GHSA-h47h-mwp9-c6q6?

Update actionmailer to 6.1.7.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h47h-mwp9-c6q6 is resolved across your whole dependency graph.

How do I detect GHSA-h47h-mwp9-c6q6 in my RubyGems dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for actionmailer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-h47h-mwp9-c6q6 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is GHSA-h47h-mwp9-c6q6 actively exploited in the wild?

No public exploit code has been indexed for GHSA-h47h-mwp9-c6q6 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-h47h-mwp9-c6q6?

GHSA-h47h-mwp9-c6q6 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 61th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-h47h-mwp9-c6q6?

GHSA-h47h-mwp9-c6q6 is classified as CWE-1333 (CWE-1333). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-h47h-mwp9-c6q6 published, and has it been updated?

GHSA-h47h-mwp9-c6q6 was published on October 15, 2024 and was last updated on January 7, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

💎 RubyGems

Not in CISA KEV

Possible ReDoS vulnerability in block_format in Action MailerGHSA-h47h-mwp9-c6q6

GHSA-h47h-mwp9-c6q6 is a CWE-1333 vulnerability in actionmailer. A fix is available for actionmailer — see the affected versions and patch details below.

Also known asBIT-rails-2024-47889CVE-2024-47889

Published

Oct 15, 2024

Updated

Jan 7, 2025

Affected

4 pkgs

Patched

4 / 4

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-h47h-mwp9-c6q6.

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

4 pkgs affected

💎actionmailer💎actionmailer💎actionmailer💎actionmailer

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.

Description

There is a possible ReDoS vulnerability in the block_format helper in Action Mailer. This vulnerability has been assigned the CVE identifier CVE-2024-47889.

Impact

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 or apply the relevant patch immediately.

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.

Releases

The fixed releases are available at the normal locations.

Workarounds

Users can avoid calling the block_format helper or upgrade to Ruby 3.2

Credits

Thanks to yuki_osaki for the report!

Affected Packages

4 total 4 fixed

Ecosystem	Package	Vulnerable range	Fix
💎RubyGems	`actionmailer`	≥ 3.0.0&&< 6.1.7.9	6.1.7.9`bundle update actionmailer --conservative`
💎RubyGems	`actionmailer`	≥ 7.0.0&&< 7.0.8.5	7.0.8.5`bundle update actionmailer --conservative`
💎RubyGems	`actionmailer`	≥ 7.1.0&&< 7.1.4.1	7.1.4.1`bundle update actionmailer --conservative`
💎RubyGems	`actionmailer`	≥ 7.2.0&&< 7.2.1.1	7.2.1.1`bundle update actionmailer --conservative`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for actionmailer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update actionmailer to 6.1.7.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h47h-mwp9-c6q6 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow

Workaround published by Red Hat

Users can avoid calling the block_format helper or upgrade to Ruby 3.2.

Source: Red Hat security advisory for GHSA-h47h-mwp9-c6q6 (CC BY 4.0)

Frequently Asked Questions

There is a possible ReDoS vulnerability in the block_format helper in Action Mailer. This vulnerability has been assigned the CVE identifier CVE-2024-47889. Impact ------ 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 or apply the relevant patch immediately. 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. Releases ------

O3 Security · Impact-Aware SCA

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