CVE-2026-48101
CVE-2026-48101 · GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure
This page contains facts from public vulnerability sources. Check the original advisory before updating.
7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.
CVSS 6.5 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
7-zip
- Versions
- >= 9.21, < 26.01: Affected
No fix published
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
- Affected ranges
- ECOSYSTEM: < 22.01+really26.01+dfsg-0+deb12u1
Update to 22.01+really26.01+dfsg-0+deb12u1
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
- 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
- Affected ranges
- ECOSYSTEM: < 26.01+dfsg-1
Update to 26.01+dfsg-1
p7zip Debian:12
- Versions
- 16.02+dfsg-8
- 16.02+really25.01+dfsg-0+deb12u1
- Affected ranges
- ECOSYSTEM: < 16.02+really26.01+dfsg-0+deb12u1
Update to 16.02+really26.01+dfsg-0+deb12u1
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
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:25.10
- Versions
- 24.09+dfsg-7
- 24.09+dfsg-8
- 25.00+dfsg-1
- 25.01+dfsg-1
- 25.01+dfsg-2
- 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