{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85091 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-85091 is a high-severity memory corruption vulnerability in zlib, published on 3 Sep 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-2026-85091 and fix it if it is affected.\n\nWhat it is: CVE-2026-85091 is a high-severity memory corruption vulnerability in zlib, published on 3 Sep 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-2026-85091 exists.\n\nAffected product: zlib. 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-2026-85091/ (Markdown: https://insights.sbomify.com/CVE-2026-85091/index.md)","id":"CVE-2026-85091","markdown":"https://insights.sbomify.com/CVE-2026-85091/index.md","name":"CVE-2026-85091","record":{"aliases":["ALPINE-CVE-2026-85091","AZL-99090","AZL-99174","AZL-99234","AZL-99276","AZL-99294","BELL-CVE-2026-85091","DEBIAN-CVE-2026-85091","ECHO-2e36-531c-37dd","GHSA-g5fp-32jq-cfw2","ROOT-OS-ALPINE-320-CVE-2026-85091","ROOT-OS-DEBIAN-12-CVE-2026-85091","ROOT-OS-DEBIAN-13-CVE-2026-85091","UBUNTU-CVE-2026-85091","USN-8954-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"zlib compression library","requires_auth":"none","summary":"Attackers can trigger a heap buffer overflow in zlib via specific gzwrite operations, potentially leading to code execution or denial of service.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.","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":"zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate","id":"CVE-2026-85091","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"LiME through 1.12.0 Arbitrary File Overwrite via Symlink Following","id":"CVE-2026-85092"},"packages":[],"prev":{"headline":"FreeRDP before 3.31.0 Heap Out-of-Bounds Read via AVC444","id":"CVE-2026-85090"},"products":["zlib"],"published":"2026-09-03","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-03","vendors":["zlib"]},"summary":"Attackers can trigger a heap buffer overflow in zlib via specific gzwrite operations, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2026-85091/"}