{"answers":{"affected":"2 open source packages ship an affected version, including @stablelib/cbor.","exploited":"There is no known exploitation of CVE-2026-106448 in the wild and no public exploit code.","fix":"Upgrade @stablelib/cbor to 2.0.3 or later.","what":"CVE-2026-106448 is a high-severity unsafe deserialization vulnerability in stablelib, published on 6 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-2026-106448 and fix it if it is affected.\n\nWhat it is: CVE-2026-106448 is a high-severity unsafe deserialization vulnerability in stablelib, published on 6 Oct 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-2026-106448 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @stablelib/cbor (npm): affected all versions; fixed in 2.0.3\n- @stablelib/cbor (npm): affected all versions; fixed in 2.0.3\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-2026-106448/ (Markdown: https://insights.sbomify.com/CVE-2026-106448/index.md)","id":"CVE-2026-106448","markdown":"https://insights.sbomify.com/CVE-2026-106448/index.md","name":"CVE-2026-106448","record":{"aliases":["GHSA-w48f-fwg7-ww6p"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["privilege_escalation","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"JavaScript CBOR library","requires_auth":"none","summary":"Attackers can poison object prototypes via CBOR decoding to inject malicious properties, potentially bypassing security checks in downstream applications.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.9,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-1321","name":"Improperly Controlled Modification of Object Prototype Attributes"}],"description":"StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object's prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"StableLib: Prototype poisoning via `__proto__` map keys in CBOR decoding","id":"CVE-2026-106448","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"yawkat LZ4 Java: LZ4BlockInputStream with stopOnEmptyBlock=false recurses once per empty block, causing StackOverflowError","id":"CVE-2026-106449"},"packages":[{"ecosystem":"npm","fixed":["2.0.3"],"introduced":["0"],"last_affected":[],"package":"@stablelib/cbor","purl":null,"source":"GHSA-w48f-fwg7-ww6p"},{"ecosystem":"npm","fixed":["2.0.3"],"introduced":["0"],"last_affected":[],"package":"@stablelib/cbor","purl":"pkg:npm/%40stablelib/cbor","source":"GHSA-w48f-fwg7-ww6p"}],"prev":{"headline":"StableLib: Stack exhaustion denial of service via deeply nested CBOR arrays, maps, or tags","id":"CVE-2026-106447"},"products":["stablelib"],"published":"2026-10-06","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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-07","vendors":["StableLib"]},"summary":"Attackers can poison object prototypes via CBOR decoding to inject malicious properties, potentially bypassing security checks in downstream applications.","url":"https://insights.sbomify.com/CVE-2026-106448/"}