CVE-2026-4873
5.9
MEDIUM
CVSS 3.1
EPSS 0.33%
Description
A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.
How to fix CVE-2026-4873
To remediate CVE-2026-4873, upgrade the affected package to a fixed version below.
- Alpine/curl—upgrade to 8.20.0-r0 or later
Is CVE-2026-4873 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 7.20.0, < 8.20.0-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |