CVE catalog

CVE-2026-104086

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

[CVE catalog]

Severity: Medium · CVSS 6.8CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Oct 14, 2026, 2:17:30 PM UTC
Updated: Oct 14, 2026, 2:17:30 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.19% · Oct 27, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	7zip	sid	`26.05+dfsg-1`	fixed
Debian	7zip	forky	`26.05+dfsg-1`	fixed
Debian	7zip	trixie	`25.01+dfsg-1~deb13u2`	vulnerable
Debian	7zip	bookworm	`22.01+really26.01+dfsg-0+deb12u1`	vulnerable
Debian	7zip	bookworm-security	`22.01+really26.02+dfsg-0+deb12u1`	vulnerable
Debian	p7zip	trixie	`16.02+transitional.1`	fixed
Debian	p7zip	bookworm	`16.02+really26.01+dfsg-0+deb12u1`	vulnerable
Debian	p7zip	bookworm-security	`16.02+really26.02+dfsg-0+deb12u1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	7zip	source	sid	`26.03+dfsg-1`	unimportant	Not reported	Not reported
Debian	7zip	source	forky	`26.03+dfsg-1`	unimportant	Not reported	Not reported
Debian	7zip	source	trixie	`(unfixed)`	unimportant	Not reported	Not reported
Debian	7zip	source	bookworm	`(unfixed)`	unimportant	Not reported	Not reported
Debian	p7zip	source	trixie	`16.02+transitional.1`	unimportant	Not reported	Not reported
Debian	p7zip	source	bookworm	`(unfixed)`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[7zip]Affected
Details (6)
- 22.01+really26.01+dfsg-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
- 22.01+really26.01+dfsg-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
- 25.01+dfsg-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
- 25.01+dfsg-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
- 22.01+really26.02+dfsg-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
- 22.01+really26.02+dfsg-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
[7zip-standalone]Affected
Source package: [7zip]
Details (2)
- 25.01+dfsg-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
- 25.01+dfsg-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · 7zip · debian · bookworm; nvd · 7zip · debian · 12
[p7zip]Affected
Details (4)
- 16.02+really26.01+dfsg-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12
- 16.02+really26.01+dfsg-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12
- 16.02+really26.02+dfsg-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12
- 16.02+really26.02+dfsg-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12
[p7zip-full]Affected
Source package: [p7zip]
Details (4)
- 16.02+really26.01+dfsg-0+deb12u1 · amd64 · bookworm
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12
- 16.02+really26.01+dfsg-0+deb12u1 · arm64 · bookworm
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12
- 16.02+really26.02+dfsg-0+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12
- 16.02+really26.02+dfsg-0+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · p7zip · debian · bookworm; nvd · p7zip · debian · 12

[Debian 13 (Trixie)]

[7zip]Affected
Details (2)
- 25.01+dfsg-1~deb13u2 · amd64 · trixie
  Affected
  nvd · 7zip · debian · 13
- 25.01+dfsg-1~deb13u2 · arm64 · trixie
  Affected
  nvd · 7zip · debian · 13
[7zip-standalone]Affected
Source package: [7zip]
Details (2)
- 25.01+dfsg-1~deb13u2 · amd64 · trixie
  Affected
  nvd · 7zip · debian · 13
- 25.01+dfsg-1~deb13u2 · arm64 · trixie
  Affected
  nvd · 7zip · debian · 13
[p7zip]Fixed
Details (2)
- 16.02+transitional.1 · all · trixie
  Fixed · Fixed: 16.02+transitional.1
  nvd · p7zip · debian · 13
- 16.02+transitional.1 · all · trixie
  Fixed · Fixed: 16.02+transitional.1
  nvd · p7zip · debian · 13
[p7zip-full]Fixed
Source package: [p7zip]
Details (2)
- 16.02+transitional.1 · all · trixie
  Fixed · Fixed: 16.02+transitional.1
  nvd · p7zip · debian · 13
- 16.02+transitional.1 · all · trixie
  Fixed · Fixed: 16.02+transitional.1
  nvd · p7zip · debian · 13

Observed: Oct 24, 2026, 12:08:04 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]