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CVE-2026-119602

libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window

6.3 Medium

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.31%Unchanged since Oct 31, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.3

libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
CVE-2026-119602
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-908
Updated
2026-11-02
EUVDEUVD-2026-113939 6.3

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
EUVD-2026-113939
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-xxh6-gw5r-86fm 6.3

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS...

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
GHSA-xxh6-gw5r-86fm
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-908
Updated
2026-11-02
NVD 6.3

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
CVE-2026-119602
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-908
Updated
2026-11-02
OSV 6.3

libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
CVE-2026-119602
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-908
Updated
2026-11-02
OSVDEBIAN-CVE-2026-119602 6.3

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
DEBIAN-CVE-2026-119602
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-119602 6.3

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
UBUNTU-CVE-2026-119602
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-06
OSVAZL-112667 No score

CVE-2026-119602 affecting package clamav 1.5.4-2

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
AZL-112667
Updated
2026-11-05
OSVAZL-112676 No score

CVE-2026-119602 affecting package libmspack 0.11alpha-1

libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output.

Record
AZL-112676
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
clamav
Azure Linux:3
through 1.5.4-2 None known
libmspack
Azure Linux:3
through 0.11alpha-1 None known
libmspack
Debian:12
All versions, plus listed versions
0.11-10.11-1.10.11-1.1~exp10.11-2
None known
libmspack
Debian:13
All versions, plus listed versions
0.11-1.10.11-2
None known
libmspack
Debian:14
All versions, plus listed versions
0.11-1.10.11-2
None known
clamav
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
0.97.8+dfsg-1ubuntu40.97.8+dfsg-1ubuntu50.98.1+dfsg-1ubuntu40.98.1+dfsg-1ubuntu50.98.1+dfsg-2ubuntu2
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0.98.1+dfsg-4ubuntu10.98.1+dfsg-4ubuntu1.10.98.5+addedllvm-0ubuntu0.14.04.10.98.6+dfsg-0ubuntu0.14.04.10.98.7+dfsg-0ubuntu0.14.04.10.99.2+addedllvm-0ubuntu0.14.04.10.99.2+addedllvm-0ubuntu0.14.04.20.99.3+addedllvm-0ubuntu0.14.04.10.99.4+addedllvm-0ubuntu0.14.04.10.100.1+dfsg-1ubuntu0.14.04.10.100.1+dfsg-1ubuntu0.14.04.20.100.1+dfsg-1ubuntu0.14.04.30.100.1+dfsg-1ubuntu0.14.04.40.100.2+dfsg-1ubuntu0.14.04.10.100.2+dfsg-1ubuntu0.14.04.20.100.3+dfsg-0ubuntu0.14.04.10.100.3+dfsg-0ubuntu0.14.04.1+esm10.101.4+dfsg-0ubuntu0.14.04.1+esm10.102.1+dfsg-0ubuntu0.14.04.1+esm10.102.2+dfsg-0ubuntu0.14.04.1+esm10.102.3+dfsg-0ubuntu0.14.04.1+esm10.102.4+dfsg-0ubuntu0.14.04.1+esm10.103.2+dfsg-0ubuntu0.14.04.1+esm10.103.2+dfsg-0ubuntu0.14.04.1+esm20.103.5+dfsg-0ubuntu0.14.04.1+esm10.103.6+dfsg-0ubuntu0.14.04.1+esm10.103.8+dfsg-0ubuntu0.14.04.1+esm10.103.9+dfsg-0ubuntu0.14.04.1+esm1
None known
libmspack
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
0.4-10.4-1ubuntu0.1~esm10.4-1ubuntu0.1~esm2
None known
libmspack
Ubuntu:16.04:LTS
All versions, plus listed versions
0.5-10.5-1ubuntu0.16.04.10.5-1ubuntu0.16.04.20.5-1ubuntu0.16.04.30.5-1ubuntu0.16.04.4
None known
libmspack
Ubuntu:18.04:LTS
All versions, plus listed versions
0.6-30.6-3ubuntu0.10.6-3ubuntu0.20.6-3ubuntu0.3
None known
libmspack
Ubuntu:20.04:LTS
All versions, plus listed versions
0.10.1-10.10.1-2
None known
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Affected packages
PackageAffectedFixed
libmspack
Ubuntu:22.04:LTS
All versions, plus listed versions
0.10.1-2build10.10.1-2build20.10.1-2ubuntu0.1
None known
libmspack
Ubuntu:24.04:LTS
All versions, plus listed versions
0.11-10.11-1.10.11-1.1build10.11-1.1ubuntu0.24.04.1
None known
libmspack
Ubuntu:26.10
All versions, plus listed versions
0.11-1.1build20.11-1.1ubuntu0.26.10.1
None known
libmspack
Ubuntu:26.04:LTS
All versions, plus listed versions
0.11-1.1build10.11-1.1build20.11-1.1ubuntu0.26.04.1
None known

History

History
RecordedChangedSources
affected, referencesOSV
affected, aliases, referencesOSV
affected, aliases, facts, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-119602 is a medium vulnerability (CVSS 6.3) in Kyz Libmspack, published October 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.31%, the 23rd percentile. No source names a fixed version.

References

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