GHSA-6fj4-rcr3-r7rr

Source

https://github.com/advisories/GHSA-6fj4-rcr3-r7rr

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-6fj4-rcr3-r7rr/GHSA-6fj4-rcr3-r7rr.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-6fj4-rcr3-r7rr

Published

2026-10-16T19:55:39Z

Modified

2026-10-16T20:00:04Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

lopdf has a stack overflow via deeply nested PDF objects

Details

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.

Because 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.

Confirmed on lopdf 0.41.0 and earlier; fixed in 0.42.0. Default configuration, no features changed.

Proof of concept

fn main() {
    let bytes = std::fs::read("poc.pdf").unwrap(); // ~10,380-deep nested array in the Catalog
    let _ = lopdf::Document::load_mem(&bytes);     // stack overflow -> SIGABRT
}

An equivalent PoC is a minimal PDF whose Catalog /X value is "[" * 10380 + "]" * 10380.

Suggested fix

Enforce a maximum object-nesting depth in the parser and return an Err instead of recursing without bound.

Database specific

{
    "cwe_ids":  [
        "CWE-1124"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-16T19:55:39Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}

References

Affected packages

crates.io / lopdf

Package

Name: lopdf; View open source insights on deps.dev
Purl: pkg:cargo/lopdf

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.42.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-6fj4-rcr3-r7rr/GHSA-6fj4-rcr3-r7rr.json"