DEBIAN-CVE-2026-48104
7-Zip is a file archiver with a high compression ratio. Versions 9.18 through 26.00 contain an uninitialized heap read in the SquashFS archive handler caused by a sparsely populated index array. In the SquashFS handler, _blockToNode is allocated with capacity for every metadata block but populated only when an inode crosses a block boundary, so a crafted image with few inodes spanning many blocks leaves most slots holding raw heap contents (the underlying allocator does not zero-initialize POD storage). When OpenDir looks up an attacker-influenced blockIndex (derived from the RootInode superblock field), it reads two of these uninitialized slots and passes them as the left/right bounds of a binary search over _nodesPos, which dereferences the midpoint without bounds checking; if the resulting value happens to match the search key, the returned index is used to read a full node struct from _nodes whose fields feed further directory parsing, forming a chained OOB read primitive that is heap-layout-dependent and not reliably triggerable. The SquashFS handler is enabled by default in stock 7z.dll and the issue triggers during Open() with no interaction beyond opening the file; impact is denial of service from wild-pointer dereference and potential heap information disclosure, with no write primitive. Version 26.01 fixes the issue.
DEBIAN-CVE-2026-48104
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-48104
7zip
Source reference: /affected/0/package/name
- Affected versions
- 22.01+dfsg-10~exp1
Source reference:
/affected/0/versions22.01+dfsg-8Source reference:
/affected/0/versions22.01+dfsg-8+deb12u1Source reference:
/affected/0/versions22.01+dfsg-9Source reference:
/affected/0/versions22.01+really25.01+dfsg-0+deb12u1Source reference:
/affected/0/versions - Fixed versions
- 22.01+really26.01+dfsg-0+deb12u1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
7zip
Source reference: /affected/1/package/name
- Affected versions
- 24.09+dfsg-8
Source reference:
/affected/1/versions25.00+dfsg-1Source reference:
/affected/1/versions25.01+dfsg-1Source reference:
/affected/1/versions25.01+dfsg-1~deb13u1Source reference:
/affected/1/versions25.01+dfsg-1~deb13u1~bpo12+1Source reference:
/affected/1/versions25.01+dfsg-1~deb13u2Source reference:
/affected/1/versions25.01+dfsg-2Source reference:
/affected/1/versions25.01+dfsg-3Source reference:
/affected/1/versions25.01+dfsg-4Source reference:
/affected/1/versions25.01+dfsg-5Source reference:
/affected/1/versions26.00+dfsg-1Source reference:
/affected/1/versions26.00+dfsg-2Source reference:
/affected/1/versions26.00+dfsg-3Source reference:
/affected/1/versions26.00+dfsg-4Source reference:
/affected/1/versions26.00+dfsg-5Source reference:
/affected/1/versions26.00+dfsg1-1Source reference:
/affected/1/versions26.00+dfsg1-2Source reference:
/affected/1/versions26.00+dfsg1-3Source reference:
/affected/1/versions26.01+dfsg-1Source reference:
/affected/1/versions26.01+dfsg-2Source reference:
/affected/1/versions26.01+dfsg-3Source reference:
/affected/1/versions26.02+dfsg-1Source reference:
/affected/1/versions26.02+dfsg-2Source reference:
/affected/1/versions26.02+dfsg-3Source reference:
/affected/1/versions26.03+dfsg-1Source reference:
/affected/1/versions26.03+dfsg-2Source reference:
/affected/1/versions26.03+dfsg-3Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
7zip
Source reference: /affected/2/package/name
- Affected versions
- 24.09+dfsg-8
Source reference:
/affected/2/versions25.00+dfsg-1Source reference:
/affected/2/versions25.01+dfsg-1Source reference:
/affected/2/versions25.01+dfsg-1~deb13u1Source reference:
/affected/2/versions25.01+dfsg-1~deb13u1~bpo12+1Source reference:
/affected/2/versions25.01+dfsg-1~deb13u2Source reference:
/affected/2/versions25.01+dfsg-2Source reference:
/affected/2/versions25.01+dfsg-3Source reference:
/affected/2/versions25.01+dfsg-4Source reference:
/affected/2/versions25.01+dfsg-5Source reference:
/affected/2/versions26.00+dfsg-1Source reference:
/affected/2/versions26.00+dfsg-2Source reference:
/affected/2/versions26.00+dfsg-3Source reference:
/affected/2/versions26.00+dfsg-4Source reference:
/affected/2/versions26.00+dfsg-5Source reference:
/affected/2/versions26.00+dfsg1-1Source reference:
/affected/2/versions26.00+dfsg1-2Source reference:
/affected/2/versions26.00+dfsg1-3Source reference:
/affected/2/versions - Fixed versions
- 26.01+dfsg-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
p7zip
Source reference: /affected/3/package/name
- Affected versions
- 16.02+dfsg-8
Source reference:
/affected/3/versions16.02+really25.01+dfsg-0+deb12u1Source reference:
/affected/3/versions - Fixed versions
- 16.02+really26.01+dfsg-0+deb12u1
Source reference:
/affected/3/ranges - Prerequisites
- Not stated in this record
p7zip
Source reference: /affected/4/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 16.02+transitional.1
Source reference:
/affected/4/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "22.01+really26.01+dfsg-0+deb12u1"
}
]
}
],
"package": {
"name": "7zip",
"purl": "pkg:deb/debian/7zip?arch=source&distro=bookworm",
"ecosystem": "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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48104.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "7zip",
"purl": "pkg:deb/debian/7zip?arch=source&distro=trixie",
"ecosystem": "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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48104.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "26.01+dfsg-1"
}
]
}
],
"package": {
"name": "7zip",
"purl": "pkg:deb/debian/7zip?arch=source&distro=forky",
"ecosystem": "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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48104.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "16.02+really26.01+dfsg-0+deb12u1"
}
]
}
],
"package": {
"name": "p7zip",
"purl": "pkg:deb/debian/p7zip?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"16.02+dfsg-8",
"16.02+really25.01+dfsg-0+deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48104.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "16.02+transitional.1"
}
]
}
],
"package": {
"name": "p7zip",
"purl": "pkg:deb/debian/p7zip?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48104.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57171 · Revision 1
- Added to Heist Feed
- Publisher date