{"answers":{"affected":"2 open source packages ship an affected version, including guzzlehttp/guzzle. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-55767 in the wild and no public exploit code.","fix":"Upgrade guzzlehttp/guzzle to 7.12.1 or later.","what":"CVE-2026-55767 is a medium-severity vulnerability in guzzle, published on 23 Jun 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-2026-55767 and fix it if it is affected.\n\nWhat it is: CVE-2026-55767 is a medium-severity vulnerability in guzzle, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-55767 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- guzzlehttp/guzzle (Packagist): affected all versions; fixed in 7.12.1\n- guzzlehttp/guzzle (Packagist): affected all versions; fixed in 7.12.1\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-2026-55767/ (Markdown: https://insights.sbomify.com/CVE-2026-55767/index.md)","id":"CVE-2026-55767","markdown":"https://insights.sbomify.com/CVE-2026-55767/index.md","name":"CVE-2026-55767","record":{"aliases":["DEBIAN-CVE-2026-55767","GHSA-cwxw-98qj-8qjx","MINI-6x4g-qq74-jhhf","MINI-86p7-rr25-ghg2","MINI-8jv2-vm6m-m7wf","MINI-8v7r-q5m4-fgx9","MINI-fwqc-gp7j-jv84","MINI-m88g-3pw7-f3vp","MINI-p52p-mx6f-fh67","MINI-pr9v-65j4-xvv9","MINI-rv7r-j887-9mh8","UBUNTU-CVE-2026-55767"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"PHP HTTP client","requires_auth":"none","summary":"Attackers can inject cookies into unrelated hosts via a shared cookie jar due to improper domain validation, potentially enabling session fixation.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"guzzle","vendor":"guzzlephp"}],"cvss":{"score":5.8,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"},{"id":"CWE-1286","name":"Improper Validation of Syntactic Correctness of Input"}],"description":"Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, CookieJar incorrectly accepts cookies with a dot-only Domain attribute and whitespace-padded variants. SetCookie::matchesDomain() removes leading dots from the cookie domain, normalizing dot-only values to the empty string; SetCookie::validate() only rejected a strictly empty domain, so these cookies could be stored and the empty normalized domain was treated as matching any request host. An attacker-controlled origin that an application requests with a shared cookie jar can therefore set a cookie that Guzzle later sends to unrelated hosts using the same jar. This may allow cookie injection or session fixation against downstream services, depending on how those services interpret the injected cookie. This vulnerability is fixed in 7.12.1.","ecosystems":["Packagist"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Guzzle: Dot-Only Cookie Domains Match All Hosts in guzzlehttp/guzzle","id":"CVE-2026-55767","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":2,"n_references":5,"next":{"headline":"Integer overflow in goaccess","id":"CVE-2026-55768"},"packages":[{"ecosystem":"Packagist","fixed":["7.12.1"],"introduced":["0"],"last_affected":[],"package":"guzzlehttp/guzzle","purl":null,"source":"GHSA-cwxw-98qj-8qjx"},{"ecosystem":"Packagist","fixed":["7.12.1"],"introduced":["0"],"last_affected":[],"package":"guzzlehttp/guzzle","purl":"pkg:composer/guzzlehttp/guzzle","source":"GHSA-cwxw-98qj-8qjx"}],"prev":{"headline":"guzzlehttp/psr7: CRLF Injection in HTTP Start-Line Serialization","id":"CVE-2026-55766"},"products":["guzzle"],"published":"2026-06-23","related":[{"cvss_score":5.9,"headline":"Guzzle: Silent HTTPS-Proxy Downgrade to Cleartext","id":"CVE-2026-55568","kev_date_added":null,"published":"2026-06-23"},{"cvss_score":4.7,"headline":"Guzzle: Cookie Disclosure and Injection via IP-Address Domains","id":"CVE-2026-59883","kev_date_added":null,"published":"2026-07-08"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["guzzle"]},"summary":"Attackers can inject cookies into unrelated hosts via a shared cookie jar due to improper domain validation, potentially enabling session fixation.","url":"https://insights.sbomify.com/CVE-2026-55767/"}