{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112021 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-112021 is a high-severity memory corruption vulnerability in grunfink snac2, published on 18 Oct 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-2026-112021 and fix it if it is affected.\n\nWhat it is: CVE-2026-112021 is a high-severity memory corruption vulnerability in grunfink snac2, published on 18 Oct 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-2026-112021 exists.\n\nAffected product: grunfink snac2. 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-2026-112021/ (Markdown: https://insights.sbomify.com/CVE-2026-112021/index.md)","id":"CVE-2026-112021","markdown":"https://insights.sbomify.com/CVE-2026-112021/index.md","name":"CVE-2026-112021","record":{"aliases":["DEBIAN-CVE-2026-112021","GHSA-6hv3-2r7g-774j","UBUNTU-CVE-2026-112021"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"ActivityPub server","requires_auth":"none","summary":"Unauthenticated remote attackers can cause heap corruption and server crashes via crafted JSON payloads in snac2, potentially leading to code execution.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","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-122","name":"Heap-based Buffer Overflow"}],"description":"snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \\u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server.","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":"snac2 before 2.93 Heap-Based Buffer Overflow via JSON Parser _xs_json_load_lexer()","id":"CVE-2026-112021","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":7,"next":{"headline":"light0011 cms Captcha Validation UserController.class.php access control","id":"CVE-2026-112025"},"packages":[],"prev":{"headline":"LodePNG through 20261006 Heap Out-of-Bounds Read via getFilterTypesInterlaced()","id":"CVE-2026-112020"},"products":["snac2"],"published":"2026-10-18","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":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-19","vendors":["grunfink"]},"summary":"Unauthenticated remote attackers can cause heap corruption and server crashes via crafted JSON payloads in snac2, potentially leading to code execution.","url":"https://insights.sbomify.com/CVE-2026-112021/"}