How severe is CVE-2022-31103?

CVE-2022-31103 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-31103 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-31103?

CVE-2022-31103 affects Lettersanitizer Project Lettersanitizer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-31103?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2022-31103 published?

CVE-2022-31103 was published on 2022-06-27 and last updated on 2026-06-17.

CVE-2022-31103

CVE-2022-31103 is a high-severity vulnerability in Lettersanitizer Project Lettersanitizer with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-754.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-754
Affected product: Lettersanitizer Project Lettersanitizer
Published: 2022-06-27
Last modified: 2026-06-17

Description

lettersanitizer is a DOM-based HTML email sanitizer for in-browser email rendering. All versions of lettersanitizer below 1.0.2 are affected by a denial of service issue when processing a CSS at-rule `@keyframes`. This package is depended on by [react-letter](https://github.com/mat-sz/react-letter), therefore everyone using react-letter is also at risk. The problem has been patched in version 1.0.2.

Frequently asked questions

What is CVE-2022-31103?: lettersanitizer is a DOM-based HTML email sanitizer for in-browser email rendering. All versions of lettersanitizer below 1.0.2 are affected by a denial of service issue when processing a CSS at-rule `@keyframes`. This package is depended on by [react-letter](https://github.com/mat-sz/react-letter), therefore everyone using react-letter is also at risk. The problem has been patched in version 1.0.2.
How severe is CVE-2022-31103?: CVE-2022-31103 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2022-31103 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-31103?: CVE-2022-31103 affects Lettersanitizer Project Lettersanitizer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-31103?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-31103 published?: CVE-2022-31103 was published on 2022-06-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lettersanitizer_project:lettersanitizer:*:*:*:*:*:node.js:*:*

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