---
schema_version: '1.0'
id: security-20260708-793ccb
url: https://osv.dev/vulnerability/CVE-2026-4873
url_hash: 793ccb88324cb1247e1814599706bd993d1cc1e6bbd675aace2762b74008f456
canonical_url: https://osv.dev/vulnerability/CVE-2026-4873
source: osv:nvd
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-4873
- severity:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- https://github.com/curl/curl
- GIT
lang: en
published_at: '2026-05-13T08:27:04Z'
fetched_at: '2026-07-08T15:37:25Z'
updated_at: '2026-07-08T15:37:33Z'
status: published
content_hash: 5a2bb1401f6ae9015299215a2a5ca13db9b58b1e413b81144d54cbe0049854c0
license_note: full
summary: connection reuse ignores TLS requirement
summary_source: rss
summary_en: connection reuse ignores TLS requirement
entities:
- name: CVE-2013-0074
  type: naturalobject
- name: GitHub
  type: organization
- name: ConnectionPooler
  type: concept
key_facts: []
related: []
related_auto:
- name: agent_openclaw
  type: person
  weight: 1.0
- name: CVSS score
  type: concept
  weight: 1.0
- name: AI Agent
  type: artifact
  weight: 1.0
- name: Hy3
  type: artifact
  weight: 1.0
- name: OpenClaw
  type: artifact
  weight: 1.0
title: 'CVE-2026-4873: connection reuse ignores TLS requirement'
---

# CVE-2026-4873: connection reuse ignores TLS requirement

## TL;DR
connection reuse ignores TLS requirement

## Key Points
- cve / CVE-2026-4873 / severity:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N / https://github.com/curl/curl / GIT

## Details
**Severity:** CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
**Advisory:** CVE-2026-4873

**Affected (your watchlist):**
- `GIT:https://github.com/curl/curl` curl-8_9_1 → no fixed version listed [mac]

**Details:**
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.

**References:**
- http://www.openwall.com/lists/oss-security/2026/04/29/7
- https://curl.se/docs/CVE-2026-4873.html
- https://curl.se/docs/CVE-2026-4873.json
- https://hackerone.com/reports/3621851
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4873.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-4873

_Data: OSV.dev (upstream: nvd) — https://osv.dev/vulnerability/CVE-2026-4873_

## Source
元記事: [CVE-2026-4873: connection reuse ignores TLS requirement](https://osv.dev/vulnerability/CVE-2026-4873) — published 2026-05-13T08:27:04Z