{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6276 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-6276 is a high-severity vulnerability in Haxx Curl, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-6276 and fix it if it is affected.\n\nWhat it is: CVE-2026-6276 is a high-severity vulnerability in Haxx Curl, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-6276 exists.\n\nAffected product: Haxx Curl. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-6276/ (Markdown: https://insights.sbomify.com/CVE-2026-6276/index.md)","id":"CVE-2026-6276","markdown":"https://insights.sbomify.com/CVE-2026-6276/index.md","name":"CVE-2026-6276","record":{"aliases":["ALPINE-CVE-2026-6276","AZL-86655","AZL-86679","BELL-CVE-2026-6276","CLSA-2026-1785773934","CLSA-2026-1792808992","CURL-CVE-2026-6276","DEBIAN-CVE-2026-6276","ECHO-78b1-43ab-d59f","GHSA-2jc6-hc33-hv48","JLSEC-2026-1207","MINI-2256-qmv4-xpgc","MINI-9q6r-wh3r-gg9m","ROOT-OS-ALPINE-315-CVE-2026-6276","ROOT-OS-ALPINE-320-CVE-2026-6276","ROOT-OS-ALPINE-321-CVE-2026-6276","ROOT-OS-ALPINE-322-CVE-2026-6276","ROOT-OS-DEBIAN-11-CVE-2026-6276","ROOT-OS-DEBIAN-12-CVE-2026-6276","UBUNTU-CVE-2026-6276"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"libcurl HTTP library","requires_auth":"none","summary":"Attackers can steal cookies from a previous request when reusing a libcurl easy handle with a changed Host header.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"curl","cpe":[{"product":"curl","vendor":"haxx"}],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-319","name":"Cleartext Transmission of Sensitive Information"},{"id":"CWE-346","name":"Origin Validation Error"}],"description":"Using libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"stale custom cookie host causes cookie leak","id":"CVE-2026-6276","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"haxx:curl","products":["haxx:curl"],"type":"information_disclosure","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Incorrect Authorization in GitLab","id":"CVE-2026-6277"},"packages":[],"prev":{"headline":"StatCounter \u003c= 2.1.1 - Authenticated (Author+) Stored Cross-Site Scripting via Author Nickname","id":"CVE-2026-6275"},"products":["curl"],"published":"2026-05-13","related":[{"cvss_score":9.8,"headline":"Negotiate ambient user conn reuse","id":"CVE-2026-19931","kev_date_added":null,"published":"2026-09-06"},{"cvss_score":9.8,"headline":"HTTP/2 stream-dependency tree UAF","id":"CVE-2026-10536","kev_date_added":null,"published":"2026-07-03"},{"cvss_score":9.8,"headline":"cross-origin Digest auth state leak","id":"CVE-2026-11856","kev_date_added":null,"published":"2026-07-03"},{"cvss_score":9.8,"headline":"SASL double-free","id":"CVE-2026-8925","kev_date_added":null,"published":"2026-07-03"},{"cvss_score":9.8,"headline":"stale proxy password leak","id":"CVE-2026-9079","kev_date_added":null,"published":"2026-07-03"},{"cvss_score":9.8,"headline":"Code injection in curl","id":"CVE-2016-4606","kev_date_added":null,"published":"2020-02-21"},{"cvss_score":9.8,"headline":"Information disclosure in n/a","id":"CVE-2016-9953","kev_date_added":null,"published":"2018-03-12"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-15","vendors":["curl"]},"summary":"Attackers can steal cookies from a previous request when reusing a libcurl easy handle with a changed Host header.","url":"https://insights.sbomify.com/CVE-2026-6276/"}