CVE-2025-59937

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

go-mail is a comprehensive library for sending mails with Go. In versions 0.7.0 and below, due to incorrect handling of the mail.Address values when a sender- or recipient address is passed to the corresponding MAIL FROM or RCPT TO commands of the SMTP client, there is a possibility of wrong address routing or even ESMTP parameter smuggling. For successful exploitation, it is required that the user's code allows for arbitrary mail address input (i. e. through a web form or similar). If only static mail addresses are used (i. e. in a config file) and the mail addresses in use do not consist of quoted local parts, this should not affect users. This issue is fixed in version 0.7.1

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
40.1%
KEV
Not listed

Published

September 29, 2025

Last Modified

October 16, 2025

Advisory Details (4)

Auto-updated Jul 21, 2026
Patch available. Sources: github_pr, github, github_commit.
generic

Mail address parsing bug: RCPT misroute + ESMTP parameter smuggling · Issue #495 · wneessen/go-mail · GitHub

https://github.com/wneessen/go-mail/issues/495
github Patch Available

Insufficient address encoding when passing mail addresses to the SMTP client · Advisory · wneessen/go-mail · GitHub

https://github.com/wneessen/go-mail/security/advisories/GHSA-wpwj-69cm-q9c5
github_pr Patch Available

Fix vulnerability in mail address passing to the smtp client

Patch available: wneessen/go-mail v0.7.1 (PR #496 merged 2025-09-26)

https://github.com/wneessen/go-mail/pull/496
github_commit Patch Available

commit 42e92cfe027b (wneessen/go-mail)

Patch available: wneessen/go-mail v0.7.1 (contains commit 42e92cfe027b)

https://github.com/wneessen/go-mail/commit/42e92cfe027be04aff72921adb0f72f11d517479

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/wneessen/go-mail—0.7.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 03:00 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
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  1. 2026-07-06 13:11 UTCOSV refresh
  2. 2026-07-06 02:23 UTCEPSS rescore
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  29. 2026-06-18 01:35 UTCOSV refresh
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  63. 2026-05-29 21:54 UTCEG score recompute
  64. 2026-05-29 13:44 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-59937?
CVE-2025-59937 is a critical vulnerability published on September 29, 2025. go-mail is a comprehensive library for sending mails with Go. In versions 0.7.0 and below, due to incorrect handling of the mail.Address values when a sender- or recipient address is passed to the corresponding MAIL FROM or RCPT TO commands of the SMTP client, there is a possibility of wrong…
When was CVE-2025-59937 disclosed?
CVE-2025-59937 was first published in the National Vulnerability Database on September 29, 2025, with the most recent update on October 16, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-59937 actively exploited?
CVE-2025-59937 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-59937?
CVE-2025-59937 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2025-59937?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-59937, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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