ESB-2026.3574 — Vulnetix

ESB-2026.3574 PUBLISHED CVSS 6.5 MEDIUM

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.3574 USN-8168-1: Rust vulnerability 14 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Rust Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-33056 Original Bulletin: https://ubuntu.com/security/notices/USN-8168-1 Comment: CVSS (Max): 6.5 CVE-2026-33056 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N) CVSS Source: NIST Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N EPSS (Max): 0.0% (1st) CVE-2026-33056 2026-04-13 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8168-1: Rust vulnerability Publication date 13 April 2026 Overview rustc could be made to modify permissions on arbitrary directories. Releases 25.10 24.04 LTS 22.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o rustc - Rust systems programming language o rustc-1.62 - Rust systems programming language o rustc-1.74 - Rust systems programming language o rustc-1.76 - Rust systems programming language o rustc-1.77 - Rust systems programming language o rustc-1.78 - Rust systems programming language o rustc-1.79 - Rust systems programming language o rustc-1.80 - Rust systems programming language o rustc-1.81 - Rust systems programming language o rustc-1.82 - Rust systems programming language o rustc-1.83 - Rust systems programming language o rustc-1.84 - Rust systems programming language o rustc-1.85 - Rust systems programming language o rustc-1.88 - Rust systems programming language o rustc-1.89 - Rust systems programming language o rustc-1.91 - Rust systems programming language Details It was discovered that tar-rs embedded in rustc incorrectly handled symlinks when unpacking a tar archive. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to modify permissions of arbitrary directories outside the extraction root, and possibly escalate privileges. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 25.10 questing rustc-1.85 - 1.85.1+dfsg0ubuntu2-0ubuntu1.25.04.1 rustc-1.88 - 1.88.0+dfsg0ubuntu1-0ubuntu2 rustc - 1.75.0+dfsg0ubuntu1-0ubuntu7.4 rustc-1.74 - 1.74.1+dfsg0ubuntu1-0ubuntu15 rustc-1.76 - 1.76.0+dfsg0ubuntu1-0ubuntu0.24.04.2 rustc-1.77 - 1.77.2+dfsg1ubuntu1-0ubuntu0.24.04.1 rustc-1.78 - 1.78.0+dfsg1ubuntu1-0ubuntu0.24.04.2 rustc-1.79 - 1.79.0+dfsg1ubuntu1-0ubuntu0.24.04.1 24.04 LTS noble rustc-1.80 - 1.80.1+dfsg0ubuntu1-0ubuntu0.24.04.01 rustc-1.81 - 1.81.0+dfsg0ubuntu1-0ubuntu0.24.04.1 rustc-1.82 - 1.82.0+dfsg0ubuntu0-0ubuntu0.24.04.1 rustc-1.83 - 1.83.0+dfsg0ubuntu1~bpo2-0ubuntu0.24.04.1 rustc-1.84 - 1.84.1+dfsg0ubuntu1~bpo2-0ubuntu2.24.04.1 rustc-1.85 - 1.85.1+dfsg0ubuntu2~bpo0-0ubuntu0.24.04.2 rustc-1.89 - 1.89.0+dfsg~24.04-0ubuntu0.24.04.2 rustc-1.91 - 1.91.1+dfsg~24.04-0ubuntu0.24.04.2 rustc - 1.75.0+dfsg0ubuntu1~bpo0-0ubuntu0.22.04.1 rustc-1.62 - 1.62.1+dfsg1-1ubuntu0.22.04.3 rustc-1.76 - 1.76.0+dfsg0ubuntu1~bpo0-0ubuntu0.22.04.1 rustc-1.77 - 1.77.2+dfsg1ubuntu1~bpo0-0ubuntu0.22.04.1 rustc-1.78 - 1.78.0+dfsg1ubuntu1~bpo0-0ubuntu0.22.04.1 rustc-1.79 - 1.79.0+dfsg1ubuntu1~bpo0-0ubuntu0.22.04.1 22.04 LTS jammy rustc-1.80 - 1.80.1+dfsg0ubuntu1~bpo0-0ubuntu0.22.04.1 rustc-1.81 - 1.81.0+dfsg0ubuntu0-0ubuntu0.22.04.1 rustc-1.82 - 1.82.0+dfsg0ubuntu0~jammy-0ubuntu0.22.04.1 rustc-1.83 - 1.83.0+dfsg0ubuntu2~bpo2-0ubuntu2.22.04.1 rustc-1.84 - 1.84.1+dfsg0ubuntu1~bpo10-0ubuntu4.22.04.1 rustc-1.85 - 1.85.1+dfsg0ubuntu2~bpo0-0ubuntu1.22.04.1 rustc-1.89 - 1.89.0+dfsg~24.04-0ubuntu0.22.04.2 rustc-1.91 - 1.91.1+dfsg~22.04-0ubuntu0.22.04.3 --------------------------------------------------------------------------------- References o CVE-2026-33056 Related notices o USN-8139-1 o USN-8138-1 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1

6.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected Products

Vendor	Product	Versions
Ubuntu	Rust

Timeline

Apr 14, 2026 CVE Published
Apr 14, 2026 Distribution Patch

References

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