CVE-2026-104086
CVE-2026-104086 · 7-Zip < 26.03 SquashFS Uninitialized Memory Disclosure via UID/GID Table
This page contains facts from public vulnerability sources. Check the original advisory before updating.
7-Zip before 26.03 contains an uninitialized memory disclosure vulnerability in the SquashFS v4 archive handler (SquashfsHandler.cpp) that allows attackers to leak heap memory by crafting a malicious archive where the superblock’s no_ids field is set so that the final metadata block’s expected size is miscomputed and bypasses the size validation check. By listing or extracting the crafted archive, attackers can cause the application to return uninitialized heap memory as the kpidUserId and kpidGroupId properties, exposing potentially sensitive process memory contents to the user.
CVSS 6.8 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
7-zip
- Versions
- ≥ 0, < 26.03: Affected (custom)
Update to 26.03
7zip Debian:12
- Versions
- 22.01+dfsg-10~exp1
- 22.01+dfsg-8
- 22.01+dfsg-8+deb12u1
- 22.01+dfsg-9
- 22.01+really25.01+dfsg-0+deb12u1
- 22.01+really26.01+dfsg-0+deb12u1
- 22.01+really26.02+dfsg-0+deb12u1
- 23.01+dfsg-1
- 23.01+dfsg-10
- 23.01+dfsg-11
- 23.01+dfsg-12
- 23.01+dfsg-2
- 23.01+dfsg-3
- 23.01+dfsg-4
- 23.01+dfsg-4~exp1
- 23.01+dfsg-5
- 23.01+dfsg-6
- 23.01+dfsg-7
- 23.01+dfsg-8
- 23.01+dfsg-9
- 24.05+dfsg-1
- 24.05+dfsg-2
- 24.05+dfsg-3
- 24.06+dfsg-1
- 24.06+dfsg-2
- 24.06+dfsg-3
- 24.06+dfsg-4
- 24.07+dfsg-1
- 24.07+dfsg-2
- 24.08+dfsg-1
- 24.08+dfsg-1~bpo12+1
- 24.08+dfsg-2
- 24.09+dfsg-1
- 24.09+dfsg-2
- 24.09+dfsg-2~bpo12+1
- 24.09+dfsg-3
- 24.09+dfsg-4
- 24.09+dfsg-5
- 24.09+dfsg-6
- 24.09+dfsg-7
- 24.09+dfsg-7~bpo12+1
- 24.09+dfsg-8
- 24.09+dfsg-8~bpo12+1
- 25.00+dfsg-1
- 25.01+dfsg-1
- 25.01+dfsg-1~deb13u1
- 25.01+dfsg-1~deb13u1~bpo12+1
- 25.01+dfsg-1~deb13u2
- 25.01+dfsg-2
- 25.01+dfsg-3
- 25.01+dfsg-4
- 25.01+dfsg-5
- 26.00+dfsg-1
- 26.00+dfsg-2
- 26.00+dfsg-3
- 26.00+dfsg-4
- 26.00+dfsg-5
- 26.00+dfsg1-1
- 26.00+dfsg1-2
- 26.00+dfsg1-3
- 26.01+dfsg-1
- 26.01+dfsg-2
- 26.01+dfsg-3
- 26.02+dfsg-1
- 26.02+dfsg-2
- 26.02+dfsg-3
- 26.03+dfsg-1
- 26.03+dfsg-2
- 26.03+dfsg-3
- 26.04+dfsg-1
- 26.05+dfsg-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
7zip Debian:13
- Versions
- 24.09+dfsg-8
- 25.00+dfsg-1
- 25.01+dfsg-1
- 25.01+dfsg-1~deb13u1
- 25.01+dfsg-1~deb13u1~bpo12+1
- 25.01+dfsg-1~deb13u2
- 25.01+dfsg-2
- 25.01+dfsg-3
- 25.01+dfsg-4
- 25.01+dfsg-5
- 26.00+dfsg-1
- 26.00+dfsg-2
- 26.00+dfsg-3
- 26.00+dfsg-4
- 26.00+dfsg-5
- 26.00+dfsg1-1
- 26.00+dfsg1-2
- 26.00+dfsg1-3
- 26.01+dfsg-1
- 26.01+dfsg-2
- 26.01+dfsg-3
- 26.02+dfsg-1
- 26.02+dfsg-2
- 26.02+dfsg-3
- 26.03+dfsg-1
- 26.03+dfsg-2
- 26.03+dfsg-3
- 26.04+dfsg-1
- 26.05+dfsg-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
7zip Debian:14
- Versions
- 24.09+dfsg-8
- 25.00+dfsg-1
- 25.01+dfsg-1
- 25.01+dfsg-1~deb13u1
- 25.01+dfsg-1~deb13u1~bpo12+1
- 25.01+dfsg-1~deb13u2
- 25.01+dfsg-2
- 25.01+dfsg-3
- 25.01+dfsg-4
- 25.01+dfsg-5
- 26.00+dfsg-1
- 26.00+dfsg-2
- 26.00+dfsg-3
- 26.00+dfsg-4
- 26.00+dfsg-5
- 26.00+dfsg1-1
- 26.00+dfsg1-2
- 26.00+dfsg1-3
- 26.01+dfsg-1
- 26.01+dfsg-2
- 26.01+dfsg-3
- 26.02+dfsg-1
- 26.02+dfsg-2
- 26.02+dfsg-3
- Affected ranges
- ECOSYSTEM: < 26.03+dfsg-1
Update to 26.03+dfsg-1
p7zip Debian:12
- Versions
- 16.02+dfsg-8
- 16.02+really25.01+dfsg-0+deb12u1
- 16.02+really26.01+dfsg-0+deb12u1
- 16.02+really26.02+dfsg-0+deb12u1
- 16.02+transitional.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
p7zip Debian:13
- Affected ranges
- ECOSYSTEM: < 16.02+transitional.1
Update to 16.02+transitional.1
p7zip Ubuntu:14.04:LTS
- Versions
- 9.20.1~dfsg.1-4
- 9.20.1~dfsg.1-4+deb7u1build0.14.04.1
- 9.20.1~dfsg.1-4+deb7u2build0.14.04.1
- 9.20.1~dfsg.1-4+deb7u3build0.14.04.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
p7zip Ubuntu:16.04:LTS
- Versions
- 9.20.1~dfsg.1-4.2
- 9.20.1~dfsg.1-4.2ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
p7zip Ubuntu:18.04:LTS
- Versions
- 16.02+dfsg-4
- 16.02+dfsg-5
- 16.02+dfsg-6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
p7zip Ubuntu:20.04:LTS
- Versions
- 16.02+dfsg-7
- 16.02+dfsg-7build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
p7zip Ubuntu:22.04:LTS
- Versions
- 16.02+dfsg-8
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
7zip Ubuntu:Pro:22.04:LTS
- Versions
- 21.03~beta+dfsg-6
- 21.04~beta+dfsg-1
- 21.06+dfsg-1
- 21.07+dfsg-1
- 21.07+dfsg-2
- 21.07+dfsg-3
- 21.07+dfsg-4
- 21.07+dfsg-4ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
p7zip Ubuntu:24.04:LTS
- Versions
- 16.02+dfsg-8
- 16.02+transitional.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
7zip Ubuntu:Pro:24.04:LTS
- Versions
- 23.01+dfsg-3
- 23.01+dfsg-7
- 23.01+dfsg-8
- 23.01+dfsg-11
- 23.01+dfsg-11ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
7zip Ubuntu:26.10
- Versions
- 26.00+dfsg-1
- 26.01+dfsg-2
- 26.01+dfsg-3
- 26.02+dfsg-1
- 26.02+dfsg-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
7zip Ubuntu:26.04:LTS
- Versions
- 25.01+dfsg-2
- 25.01+dfsg-3
- 25.01+dfsg-4
- 25.01+dfsg-5
- 26.00+dfsg-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published