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has a stack overflow via deeply nested PDF objects","description":"`lopdf::Document::load_mem` (and the other `load*` entry points) parses nested PDF arrays and dictionaries with unbounded recursion. A small crafted PDF whose Catalog contains a deeply nested array (`/X [[[ … ]]]`, on the order of 10,000 levels) exhausts the call stack and aborts the process with `SIGABRT`.\n\nBecause this is a stack-overflow abort rather than a `panic!`, it cannot be caught with `catch_unwind`: any service that parses untrusted PDF input with lopdf can be crashed by a ~21 KB file, resulting in a denial of service.\n\nConfirmed on lopdf 0.41.0 and earlier; fixed in 0.42.0. Default configuration, no features changed.\n\n## Proof of concept\n\n```rust\nfn main() {\n    let bytes = std::fs::read(\"poc.pdf\").unwrap(); // ~10,380-deep nested array in the Catalog\n    let _ = lopdf::Document::load_mem(\u0026bytes);     // stack overflow -\u003e SIGABRT\n}\n```\n\nAn equivalent PoC is a minimal PDF whose Catalog `/X` value is `\"[\" * 10380 + \"]\" * 10380`.\n\n## Suggested fix\n\nEnforce a maximum object-nesting depth in the parser and return an `Err` instead of recursing without bound.","origin":"UNSPECIFIED","severity":"HIGH","published_at":"2026-10-16T19:55:39.000Z","withdrawn_at":null,"classification":"GENERAL","cvss_score":7.5,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","references":["https://github.com/J-F-Liu/lopdf/issues/502","https://github.com/J-F-Liu/lopdf/pull/503","https://github.com/J-F-Liu/lopdf/commit/c755394ad7dd651ccfe77c618f90ab779da1dfd9","https://rustsec.org/advisories/RUSTSEC-2026-0187.html","https://github.com/advisories/GHSA-6fj4-rcr3-r7rr"],"source_kind":"github","identifiers":["GHSA-6fj4-rcr3-r7rr"],"repository_url":null,"blast_radius":0.0,"created_at":"2026-10-16T20:00:53.374Z","updated_at":"2026-10-18T20:00:30.578Z","epss_percentage":null,"epss_percentile":null,"api_url":"https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS02Zmo0LXJjcjMtcjdycs4AB-En","html_url":"https://advisories.ecosyste.ms/advisories/GSA_kwCzR0hTQS02Zmo0LXJjcjMtcjdycs4AB-En","packages":[{"ecosystem":"cargo","package_name":"lopdf","versions":[{"first_patched_version":"0.42.0","vulnerable_version_range":"\u003c 0.42.0"}],"purl":"pkg:cargo/lopdf"}],"related_packages_url":"https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS02Zmo0LXJjcjMtcjdycs4AB-En/related_packages","related_advisories":[]}],"docker_usage_url":"https://docker.ecosyste.ms/usage/cargo/lopdf","docker_dependents_count":null,"docker_downloads_count":null,"usage_url":"https://repos.ecosyste.ms/usage/cargo/lopdf","dependent_repositories_url":"https://repos.ecosyste.ms/api/v1/usage/cargo/lopdf/dependencies","status":null,"funding_links":[],"critical":null,"issue_metadata":{"last_synced_at":"2026-10-23T11:00:16.828Z","issues_count":205,"pull_requests_count":319,"avg_time_to_close_issue":34346773.02521008,"avg_time_to_close_pull_request":125846.73666666666,"issues_closed_count":119,"pull_requests_closed_count":300,"pull_request_authors_count":94,"issue_authors_count":159,"avg_comments_per_issue":1.697560975609756,"avg_comments_per_pull_request":0.3166144200626959,"merged_pull_requests_count":289,"bot_issues_count":0,"bot_pull_requests_count":0,"past_year_issues_count":33,"past_year_pull_requests_count":85,"past_year_avg_time_to_close_issue":2274178.8571428573,"past_year_avg_time_to_close_pull_request":102230.60240963855,"past_year_issues_closed_count":21,"past_year_pull_requests_closed_count":83,"past_year_pull_request_authors_count":42,"past_year_issue_authors_count":30,"past_year_avg_comments_per_issue":0.6363636363636364,"past_year_avg_comments_per_pull_request":0.23529411764705882,"past_year_bot_issues_count":0,"past_year_bot_pull_requests_count":0,"past_year_merged_pull_requests_count":78,"issues_url":"https://issues.ecosyste.ms/api/v1/hosts/GitHub/repositories/J-F-Liu%2Flopdf/issues","maintainers":[{"login":"Heinenen","count":45,"url":"https://issues.ecosyste.ms/api/v1/hosts/GitHub/authors/Heinenen"},{"login":"williamdes","count":1,"url":"https://issues.ecosyste.ms/api/v1/hosts/GitHub/authors/williamdes"}],"active_maintainers":[]},"versions_url":"https://packages.ecosyste.ms/api/v1/registries/crates.io/packages/lopdf/versions","version_numbers_url":"https://packages.ecosyste.ms/api/v1/registries/crates.io/packages/lopdf/version_numbers","latest_version_url":"https://packages.ecosyste.ms/api/v1/registries/crates.io/packages/lopdf/latest_version","dependent_packages_url":"https://packages.ecosyste.ms/api/v1/registries/crates.io/packages/lopdf/dependent_packages","related_packages_url":"https://packages.ecosyste.ms/api/v1/registries/crates.io/packages/lopdf/related_packages","codemeta_url":"https://packages.ecosyste.ms/api/v1/registries/crates.io/packages/lopdf/codemeta","maintainers":[{"uuid":"5531","login":"J-F-Liu","name":"Junfeng Liu","email":null,"url":"https://github.com/J-F-Liu","packages_count":14,"html_url":"https://crates.io/users/J-F-Liu","role":null,"created_at":"2022-11-07T21:34:10.323Z","updated_at":"2022-11-07T21:34:10.323Z","packages_url":"https://packages.ecosyste.ms/api/v1/registries/crates.io/maintainers/J-F-Liu/packages"}]}