Back
CVE-2026-4873connection reuse ignores TLS requirement
- 5.9MediumCVSS base score
- 0.33%Exploitation in 30 daysEPSS · top 74% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By curl
- 48 days later
· 48 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Modified | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.33% · top 74% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Affected products
- affected 7.20.0 – < 8.14.2
- affected 8.15.0 – < 8.16.1
- affected 8.17.0 – < 8.20.0
- affected ec3bb8f727405642a471b4b1b9eb0118fc003104 – < 507e7be573b0a76fca597b75ff7cb27a66e7d865
- affected 8.19.0
- affected 8.18.0
- affected 8.17.0
- affected 8.16.0
- affected 8.15.0
- affected 8.14.1
- affected 8.14.0
- affected 8.13.0
- affected 8.12.1
- affected 8.12.0
- affected 8.11.1
- affected 8.11.0
- affected 8.10.1
- affected 8.10.0
- affected 8.9.1
- affected 8.9.0
- affected 8.8.0
- affected 8.7.1
- affected 8.7.0
- affected 8.6.0
- affected 8.5.0
- affected 8.4.0
- affected 8.3.0
- affected 8.2.1
- affected 8.2.0
- affected 8.1.2
- affected 8.1.1
- affected 8.1.0
- affected 8.0.1
- affected 8.0.0
- affected 7.88.1
- affected 7.88.0
- affected 7.87.0
- affected 7.86.0
- affected 7.85.0
- affected 7.84.0
- affected 7.83.1
- affected 7.83.0
- affected 7.82.0
- affected 7.81.0
- and 92 more
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-29922 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-4873)Record last updated .