---
schema_version: '1.0'
id: security-20260705-0bdb31
url: https://osv.dev/vulnerability/CURL-CVE-2026-11856
url_hash: 0bdb31662b3b2dc69c68cfa4a3817ec5651e4ec9d3669995c7dc0bb1d33e298c
canonical_url: https://osv.dev/vulnerability/CURL-CVE-2026-11856
source: osv:osv
category: security/library
category_raw: cve/library
region: null
tags:
- cve
- CVE-2026-11856
- CURL-CVE-2026-11856
- severity:Medium
- https://github.com/curl/curl
- GIT
lang: en
published_at: '2026-06-24T08:00:00Z'
fetched_at: '2026-07-05T15:34:34Z'
updated_at: '2026-07-05T15:37:46Z'
status: published
content_hash: 020a87825ce2e9ed8304cda5d4f79a07f60a44ca22417fcbc0bc230efb1bed83
license_note: full
summary: cross-origin Digest auth state leak
summary_source: rss
summary_en: cross-origin Digest auth state leak
entities:
- name: GitHub
  type: organization
- name: golfdigest.co.jp
  type: organization
- name: Android_Authority
  type: organization
- name: State Synchronization
  type: UNKNOWN
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-2026-11856: 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 / CURL-CVE-2026-11856 / severity:Medium / https://github.com/curl/curl / GIT

## Details
**Severity:** Medium
**Advisory:** CURL-CVE-2026-11856 (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`.

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

## Source
元記事: [CVE-2026-11856: cross-origin Digest auth state leak](https://osv.dev/vulnerability/CURL-CVE-2026-11856) — published 2026-06-24T08:00:00Z