CVE-2026-4873CWE-295CWE-319

CVE-2026-4873

Medium · published May 13, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
28.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00359 · 28.4th percentile
Weaknesses
CWE-295 · Improper Certificate Validation; CWE-319 · Cleartext Transmission of Sensitive Information
Published
2026-05-13T17:01Z
Affected products (1)
ProductVersionsFixed in
haxx/curl≥ 7.20.0, < 8.20.08.20.0
References (4)
EPSS history
Timeline
  • 13 MAY 08:27Z
    connection reuse ignores TLS requirement
    cvelistv5