---
schema_version: '1.0'
id: security-20260705-7a3f68
url: https://osv.dev/vulnerability/CURL-CVE-2026-4873
url_hash: 7a3f684d9964ebbaaedb8fe5630d77a7cd779ab3f14294a6218ce3d84b354d9d
canonical_url: https://osv.dev/vulnerability/CURL-CVE-2026-4873
source: osv:osv
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-4873
- CURL-CVE-2026-4873
- severity:Low
- https://github.com/curl/curl
- GIT
lang: en
published_at: '2026-04-29T08:00:00Z'
fetched_at: '2026-07-05T15:34:34Z'
updated_at: '2026-07-05T15:37:46Z'
status: published
content_hash: 643bfd86b1faf90fe96c38b814e495a8d58e23396242b226e44be01cf4f07658
license_note: full
summary: connection reuse ignores TLS requirement
summary_source: rss
summary_en: connection reuse ignores TLS requirement
entities:
- name: GitHub
  type: organization
key_facts: []
related: []
related_auto:
- name: Anonymous
  type: organization
  weight: 1.0
- name: AirPods
  type: artifact
  weight: 1.0
- name: Claude Code
  type: artifact
  weight: 1.0
- name: セッション漏洩
  type: event
  weight: 1.0
- name: local-llm
  type: content
  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 / CURL-CVE-2026-4873 / severity:Low / https://github.com/curl/curl / GIT

## Details
**Severity:** Low
**Advisory:** CURL-CVE-2026-4873 (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.

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

## Source
元記事: [CVE-2026-4873: connection reuse ignores TLS requirement](https://osv.dev/vulnerability/CURL-CVE-2026-4873) — published 2026-04-29T08:00:00Z