{"answers":{"affected":"1 open source package ship an affected version, including skiplist.","exploited":"There is no known exploitation of RUSTSEC-2026-0300 in the wild and no public exploit code.","fix":"Upgrade skiplist to 1.1.1 or later.","what":"RUSTSEC-2026-0300 is an use after free vulnerability in skiplist, published on 2 Sep 2026."},"fix_prompt":"Check this codebase for RUSTSEC-2026-0300 and fix it if it is affected.\n\nWhat it is: RUSTSEC-2026-0300 is an use after free vulnerability in skiplist, published on 2 Sep 2026. \nExploitation: There is no known exploitation of RUSTSEC-2026-0300 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- skiplist (crates.io): affected from 0.0.0-0; fixed in 1.1.1\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/RUSTSEC-2026-0300/ (Markdown: https://insights.sbomify.com/RUSTSEC-2026-0300/index.md)","id":"RUSTSEC-2026-0300","markdown":"https://insights.sbomify.com/RUSTSEC-2026-0300/index.md","name":"RUSTSEC-2026-0300","record":{"aliases":["GHSA-x6j6-3ffp-qrfr"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"unknown","non_default_config":false,"product_category":"Rust SkipList library","requires_auth":"none","summary":"A use-after-free and double-free vulnerability in the Rust SkipList library allows attackers to execute arbitrary code or cause denial of service if element Drop panics.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"`SkipList::clear` drops the node chain and only then resets `tail` and `len`.\nThe drop runs each element's `Drop`, and `T` carries no bounds excluding a\npanicking one. If it unwinds, `tail` still points at the freed node while `len`\nstays non-zero.\n\n`back()`, `back_mut()`, `last_key_value()` and `last()` dereference `tail`\nthrough `unsafe`, so reading the container after the unwind is a use-after-free\n(CWE-416). `Drop for SkipList` calls `Box::from_raw` on `self.head`, which\n`clear` already destroyed, so dropping the container is a double free\n(CWE-415).\n\n`retain`, `retain_mut` and `dedup_by` reach the same state through\n`Node::filter_rebuild`, which frees nodes and runs a user predicate before the\ncaller commits `tail` and `len`. There the head links are left partially\nrewired, so traversal can also reach freed nodes.\n\n## Mitigation\n\nUpdate to 1.1.1.","ecosystems":["crates.io"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":true,"headline":"Use-after-free in `clear` and `retain` when an element's `Drop` panics","id":"RUSTSEC-2026-0300","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"crates.io","fixed":["1.1.1"],"introduced":["0.0.0-0"],"last_affected":[],"package":"skiplist","purl":"pkg:cargo/skiplist","source":"RUSTSEC-2026-0300"}],"products":null,"published":"2026-09-02","related":[],"sources":[{"class":"open","licence":"CC0 1.0","name":"RustSec","prefix":"RUSTSEC"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":"A use-after-free and double-free vulnerability in the Rust SkipList library allows attackers to execute arbitrary code or cause denial of service if element Drop panics.","url":"https://insights.sbomify.com/RUSTSEC-2026-0300/"}