{"answers":{"affected":"3 open source packages ship an affected version, including py7zr.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55206 exists.","fix":"Upgrade py7zr to 1.1.3 or later.","what":"CVE-2026-55206 is a high-severity denial of service vulnerability in miurahr py7zr, published on 8 Jul 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-2026-55206 and fix it if it is affected.\n\nWhat it is: CVE-2026-55206 is a high-severity denial of service vulnerability in miurahr py7zr, published on 8 Jul 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-2026-55206 exists.\n\nAffected packages and fixed versions:\n- py7zr (PyPI): affected all versions; fixed in 1.1.3\n- py7zr (PyPI): affected all versions; fixed in 1.1.3\n- py7zr (PyPI): affected all versions; fixed in 1.1.3\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-2026-55206/ (Markdown: https://insights.sbomify.com/CVE-2026-55206/index.md)","id":"CVE-2026-55206","markdown":"https://insights.sbomify.com/CVE-2026-55206/index.md","name":"CVE-2026-55206","record":{"aliases":["DEBIAN-CVE-2026-55206","GHSA-h4gh-22qq-72r7","PYSEC-2026-2973","UBUNTU-CVE-2026-55206"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python 7zip library","requires_auth":"none","summary":"A crafted 7z archive can cause excessive CPU consumption in the py7zr library, leading to denial of service during archive initialization.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-407","name":"Inefficient Algorithmic Complexity"}],"description":"py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, PackInfo._read() in archiveinfo.py used an O(n^2) cumulative sum pattern for attacker-controlled numstreams values parsed from archive headers, allowing a crafted .7z archive to cause excessive CPU consumption during SevenZipFile.init() before extraction. This issue is fixed in version 1.1.3.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"py7zr: O(n^2) algorithmic complexity DoS in PackInfo._read()","id":"CVE-2026-55206","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Pimcore: Account Takeover via Password Reset URL Injection allows unauthenticated attacker to hijack any admin account with 2FA bypass","id":"CVE-2026-55207"},"packages":[{"ecosystem":"PyPI","fixed":["1.1.3"],"introduced":["0"],"last_affected":[],"package":"py7zr","purl":null,"source":"GHSA-h4gh-22qq-72r7"},{"ecosystem":"PyPI","fixed":["1.1.3"],"introduced":["0"],"last_affected":[],"package":"py7zr","purl":"pkg:pypi/py7zr","source":"GHSA-h4gh-22qq-72r7"},{"ecosystem":"PyPI","fixed":["1.1.3"],"introduced":["0"],"last_affected":[],"package":"py7zr","purl":"pkg:pypi/py7zr","source":"PYSEC-2026-2973"}],"prev":{"headline":"Hermes WebUI \u003c 0.51.468 - Resource Exhaustion via Unauthenticated OAuth Flow Endpoint","id":"CVE-2026-55205"},"products":["py7zr"],"published":"2026-07-08","related":[],"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":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"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":"2026-07-09","vendors":["miurahr"]},"summary":"A crafted 7z archive can cause excessive CPU consumption in the py7zr library, leading to denial of service during archive initialization.","url":"https://insights.sbomify.com/CVE-2026-55206/"}