---
schema_version: '1.0'
id: security-20260708-ca0560
url: https://osv.dev/vulnerability/CVE-2026-6276
url_hash: ca0560a27d47aa0404bc48044f6a3501a6cb664ff116a4b859124573c4d1b208
canonical_url: https://osv.dev/vulnerability/CVE-2026-6276
source: osv:nvd
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-6276
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- https://github.com/curl/curl
- GIT
lang: en
published_at: '2026-05-13T08:28:19Z'
fetched_at: '2026-07-08T15:37:25Z'
updated_at: '2026-07-08T15:38:04Z'
status: published
content_hash: 0d3ea8e9ebadb0347ca4bec21a9e6736053531a4ac7490fa8f55783586a2230a
license_note: full
summary: stale custom cookie host causes cookie leak
summary_source: rss
summary_en: stale custom cookie host causes cookie leak
entities:
- name: CVE-2013-0074
  type: naturalobject
- name: GitHub
  type: organization
- name: customer
  type: person
- name: ghost
  type: artifact
key_facts: []
related: []
related_auto:
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  type: organization
  weight: 2.0
- name: agent_openclaw
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title: 'CVE-2026-6276: stale custom cookie host causes cookie leak'
---

# CVE-2026-6276: stale custom cookie host causes cookie leak

## TL;DR
stale custom cookie host causes cookie leak

## Key Points
- cve / CVE-2026-6276 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H / https://github.com/curl/curl / GIT

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
**Advisory:** CVE-2026-6276

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

**Details:**
Using libcurl, when a custom `Host:` header is first set for an HTTP request
and a second request is subsequently done using the same *easy handle* but
without the custom `Host:` header set, the second request would use stale
information and pass on cookies meant for the first host in the second
request. Leak them.

**References:**
- http://www.openwall.com/lists/oss-security/2026/04/29/13
- https://curl.se/docs/CVE-2026-6276.html
- https://curl.se/docs/CVE-2026-6276.json
- https://hackerone.com/reports/3671818
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6276.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-6276

_Data: OSV.dev (upstream: nvd) — https://osv.dev/vulnerability/CVE-2026-6276_

## Source
元記事: [CVE-2026-6276: stale custom cookie host causes cookie leak](https://osv.dev/vulnerability/CVE-2026-6276) — published 2026-05-13T08:28:19Z