Vulnerability in Useplunk Plunk
CVE-2026-34975
Plunk is an open-source email platform built on top of AWS SES. Prior to 0.8.0, a CRLF header injection vulnerability was discovered in SESService.ts, where user-supplied values for from.name, subject, custom header keys/values, and attach…
Vulnerability class: CRLF Injection
EPSS: 0.000 (13.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.
Affected products
- Useplunk Plunk — versions < 0.8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/useplunk/plunk/security/advisories/GHSA-2mvm-rg5v-7hfq (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-34975?
- CVE-2026-34975 is a high-severity vulnerability in Useplunk Plunk, classified under CRLF Injection. CVSS score: 8.5/10. Published 2026-04-06.
- How severe is CVE-2026-34975?
- High severity. CVSS v3 base score is 8.5 out of 10.
- Is CVE-2026-34975 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.