CVE-2026-5223
Crates in third party registries can override the cached source of other crates
Description
Cargo incorrectly handled symlinks inside of crate tarballs downloaded from third-party registries, allowing a malicious crate to override the source code of another crate from the same registry. The severity of the vulnerability is **medium** for users of third-party registries. Users of crates.io are **not affected**, as crates.io forbids uploading crates containing any symlink.
INFO
Published Date :
May 25, 2026, 10:16 a.m.
Last Modified :
June 1, 2026, 5:52 p.m.
Remotely Exploit :
Yes !
Source :
986d4109-89ea-491f-99fd-a8e4803919bd
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 986d4109-89ea-491f-99fd-a8e4803919bd | ||||
| CVSS 4.0 | MEDIUM | 986d4109-89ea-491f-99fd-a8e4803919bd |
Solution
- Update Cargo to the latest secure version.
- Avoid using third-party registries that allow symlinks.
- Verify crate integrity before use.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-5223.
| URL | Resource |
|---|---|
| https://blog.rust-lang.org/2026/05/25/cve-2026-5223/ | Mitigation Vendor Advisory |
| https://github.com/rust-lang/cargo/pull/17031 | Issue Tracking Patch |
| https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8 | Third Party Advisory Mailing List |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-5223 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-5223
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-5223 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-5223 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:rust-lang:cargo:*:*:*:*:*:rust:*:* versions up to (excluding) 1.96.0 Added Reference Type rust: https://blog.rust-lang.org/2026/05/25/cve-2026-5223/ Types: Mitigation, Vendor Advisory Added Reference Type rust: https://github.com/rust-lang/cargo/pull/17031 Types: Issue Tracking, Patch Added Reference Type rust: https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8 Types: Mailing List, Third Party Advisory -
New CVE Received by 986d4109-89ea-491f-99fd-a8e4803919bd
May. 25, 2026
Action Type Old Value New Value Added Description Cargo incorrectly handled symlinks inside of crate tarballs downloaded from third-party registries, allowing a malicious crate to override the source code of another crate from the same registry. The severity of the vulnerability is **medium** for users of third-party registries. Users of crates.io are **not affected**, as crates.io forbids uploading crates containing any symlink. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-61 Added Reference https://blog.rust-lang.org/2026/05/25/cve-2026-5223/ Added Reference https://github.com/rust-lang/cargo/pull/17031 Added Reference https://groups.google.com/g/rustlang-security-announcements/c/IB74S7Yksg8