In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Qua
In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Quantum block, leading to an out-of-bounds write.
- Published
- Oct 22, 2018
- Updated
- Jun 16, 2026
- EPSS
- 3.1% · 87th percentile
- CWE
- CWE-787
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Report tools
Action score
27
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.1%
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| cabextract project | cabextract | cpe:2.3:a:cabextract_project:cabextract |
| libmspack project | libmspack | cpe:2.3:a:libmspack_project:libmspack |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| suse | linux enterprise server | cpe:2.3:o:suse:linux_enterprise_server |
| starwindsoftware | starwind virtual san | cpe:2.3:a:starwindsoftware:starwind_virtual_san |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cabextract project cabextractbefore 1.8
- canonical ubuntu linux12.04
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux18.04
- canonical ubuntu linux18.10
- debian debian linux8.0
- libmspack project libmspack0.3
- libmspack project libmspack0.4
- libmspack project libmspack0.5
- libmspack project libmspack0.6
- libmspack project libmspack0.7
- libmspack project libmspack0.7.1
- redhat enterprise linux7.0
- starwindsoftware starwind virtual sanall versions
- suse linux enterprise server11
- suse linux enterprise server12
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | cabextract | before 1.8-r0 | 1.8-r0 |
| Alpine:v3.10 | libmspack | before 0.8_alpha-r0 | 0.8_alpha-r0 |
| Debian:12 | cabextract | before 1.4-5 | 1.4-5 |
| Debian:12 | libmspack | before 0.8-1 | 0.8-1 |
| Debian:8 | libmspack | before 0.5-1+deb8u3 | 0.5-1+deb8u3 |
| Red Hat:enterprise_linux:7::client | libmspack | before 0:0.5-0.7.alpha.el7 | 0:0.5-0.7.alpha.el7 |
| Red Hat:enterprise_linux:7::client | libmspack-debuginfo | before 0:0.5-0.7.alpha.el7 | 0:0.5-0.7.alpha.el7 |
| Red Hat:enterprise_linux:7::client | libmspack-devel | before 0:0.5-0.7.alpha.el7 | 0:0.5-0.7.alpha.el7 |
| SUSE:Linux Enterprise Module for Basesystem 15 | libmspack | before 0.6-3.3.11 | 0.6-3.3.11 |
| SUSE:Linux Enterprise Software Development Kit 11 SP4 | libmspack | before 0.0.20060920alpha-74.11.6.1 | 0.0.20060920alpha-74.11.6.1 |
| SUSE:Linux Enterprise Software Development Kit 12 SP5 | libmspack | before 0.4-15.7.1 | 0.4-15.7.1 |
Same product
cabextract project: all recordsOther highest-scoring records for the same primary product.
- CVE-2015-2060cabextract before 1.6 does not properly check for leading slashes when extracting files, which allows remote attackers to conduct absolute d22Monitor
- CVE-2010-2801Integer signedness error in the Quantum decompressor in cabextract before 1.3, when archive test mode is used, allows user-assisted remote a21Monitor
- CVE-2004-0916Directory traversal vulnerability in cabextract before 1.1 allows remote attackers to overwrite arbitrary files via a cabinet file containin21Monitor
- CVE-2010-2800The MS-ZIP decompressor in cabextract before 1.3 allows remote attackers to cause a denial of service (infinite loop) via a malformed MSZIP 18Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:cabextract | 1.8-r0 · Alpine:v3.10 | Package registry (OSV) |
| alpine:libmspack | 0.8_alpha-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:cabextract | 1.4-5 · Debian:12 | Package registry (OSV) |
| debian:libmspack | 0.8-1 · Debian:12 | Package registry (OSV) |
| red hat:libmspack | 0:0.5-0.7.alpha.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:libmspack-debuginfo | 0:0.5-0.7.alpha.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:libmspack-devel | 0:0.5-0.7.alpha.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:libmspack | 0.6-3.3.11 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2019:2049
- bugs.debian.org/911640
- github.com/kyz/libmspack/commit/40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2
- lists.debian.org/debian-lts-announce/2018/10/msg00017.html
- security.gentoo.org/glsa/201903-20
- usn.ubuntu.com/3814-1/
- usn.ubuntu.com/3814-2/
- usn.ubuntu.com/3814-3/
- www.cabextract.org.uk/#changes
- www.openwall.com/lists/oss-security/2018/10/22/1
- www.starwindsoftware.com/security/sw-20181213-0001/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.