---
schema_version: '1.0'
id: security-20260709-5f38ce
url: https://osv.dev/vulnerability/CVE-2026-11856
url_hash: 5f38ce4b0aad6ab7a0e29bf366656e0440376113a88997f4252e22a62707c373
canonical_url: https://osv.dev/vulnerability/CVE-2026-11856
source: osv:nvd
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-11856
- severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- https://github.com/curl/curl
- GIT
lang: en
published_at: '2026-07-03T06:13:31Z'
fetched_at: '2026-07-09T15:38:26Z'
updated_at: '2026-07-09T15:38:50Z'
status: published
content_hash: 8ab71dc0e76d5005dbefa6396f0917b9610f7b9cd3a0434077db3c70eeb81992
license_note: full
summary: cross-origin Digest auth state leak
summary_source: rss
summary_en: cross-origin Digest auth state leak
entities:
- name: CVE-2022-26925
  type: event
- name: GitHub
  type: organization
- name: Developers Digest
  type: organization
- name: AUTHENTIC BRANDS GROUP
  type: organization
- name: State TV channel
  type: organization
- name: earlyappleleaks
  type: person
key_facts: []
related: []
related_auto:
- name: GitLost
  type: concept
  weight: 4.0
- name: Windowsローカルセキュリティ認証機関(LSA
  type: location
  weight: 1.0
- name: AI Agent
  type: concept
  weight: 1.0
- name: Hy3
  type: artifact
  weight: 1.0
- name: OpenClaw
  type: artifact
  weight: 1.0
title: 'CVE-2026-11856: cross-origin Digest auth state leak'
---

# CVE-2026-11856: cross-origin Digest auth state leak

## TL;DR
cross-origin Digest auth state leak

## Key Points
- cve / CVE-2026-11856 / severity:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H / https://github.com/curl/curl / GIT

## Details
**Severity:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
**Advisory:** CVE-2026-11856

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

**Details:**
Successfully using libcurl to do a transfer to a specific HTTP origin
(`hostA`) with **Digest** authentication and then changing the origin to a
different one (`hostB`) for a second transfer, reusing the same handle, makes
libcurl wrongly pass on the  `Authorization:` header field meant for `hostA`,
to `hostB`.

**References:**
- https://curl.se/docs/CVE-2026-11856.html
- https://curl.se/docs/CVE-2026-11856.json
- https://hackerone.com/reports/3793260
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11856.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-11856

_Data: OSV.dev (upstream: nvd) — https://osv.dev/vulnerability/CVE-2026-11856_

## Source
元記事: [CVE-2026-11856: cross-origin Digest auth state leak](https://osv.dev/vulnerability/CVE-2026-11856) — published 2026-07-03T06:13:31Z