🛡️ CVE-2026-40354 on Ubuntu — xdg-desktop-portal

Distribution advisory

This page covers CVE-2026-40354 as tracked by Ubuntu, for the package xdg-desktop-portal. The fix is available in version 1.20.3+ds-1ubuntu1.1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H

• Attack vector: Local — a local account, shell or session on the host is needed.
• Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
• Privileges required: Low — an ordinary user account is enough.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: None.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

UBUNTU-CVE-2026-40354 is classified as CWE-61: UNIX Symbolic Link (Symlink) Following. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere.

Affected software

UBUNTU-CVE-2026-40354 is recorded against 1 package.

• xdg-desktop-portal (fixed in 1.20.3+ds-1ubuntu1.1)

Timeline and source

Published on 11 April 2026 and last revised on 27 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
github.com (Report)
github.com (Report)
github.com (Report)
www.openwall.com (Report)
ubuntu.com (Advisory)

Other advisories for this package

xdg-desktop-portal has other advisories on record. If you are patching this one, these are worth checking on the same host:

• OESA-2026-3000 (9.5 Critical, published 19 Jul 2026)
• OESA-2026-2999 (9.5 Critical, published 19 Jul 2026)
• OESA-2026-2998 (9.5 Critical, published 19 Jul 2026)
• SUSE-SU-2026:2712-1 (published 30 Jun 2026)
• USN-8287-1 (published 20 May 2026)
• OESA-2026-2184 (2.0 Low, published 3 May 2026)
• OESA-2026-2183 (2.0 Low, published 3 May 2026)
• OESA-2026-2182 (2.0 Low, published 3 May 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-61: UNIX Symbolic Link (Symlink) Following) in other software:

• CVE-2026-47763 (published 4 Aug 2026)
• CVE-2026-54574 (8.2 High, published 29 Jul 2026)
• CVE-2026-56748 (8.8 High, published 27 Jul 2026)
• CVE-2026-65010 (6.6 Medium, published 23 Jul 2026)
• CVE-2026-12080 (7.3 High, published 20 Jul 2026)
• CVE-2026-59674 (published 14 Jul 2026)
• CVE-2026-39822 (7.8 High, published 8 Jul 2026)
• CVE-2026-23968 (5.5 Medium, published 7 Jul 2026)

CVE-2026-40354 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Affected Packages

References