Vulnerability · Published Apr 2, 2026 · Assigned by GitHub_M
CVE-2026-34752Haraka affected by DoS via `__proto__` email header
High 8.7
In plain English
A high-severity security flaw in Haraka from haraka. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.4%top 61.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Haraka is a Node.js mail server. Prior to version 3.1.4, sending an email with __proto__: as a header name crashes the Haraka worker process. This issue has been patched in version 3.1.4.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | haraka | 3.1.4 | GHSA-xph3-r2jf-4vp3 |
Affected products (as reported)
Weakness: CWE-248 · Vector: 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
References
- https://github.com/haraka/Haraka/security/advisories/GHSA-xph3-r2jf-4vp3 x_refsource_CONFIRM
- https://github.com/haraka/Haraka/releases/tag/v3.1.4 x_refsource_MISC