Info-ZIP UnZip 6.0 mishandles the overlapping of files inside a ZIP container, leading to denial of service (resource consumption), aka a "b
Info-ZIP UnZip 6.0 mishandles the overlapping of files inside a ZIP container, leading to denial of service (resource consumption), aka a "better zip bomb" issue.
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 help- Published
- Jul 4, 2019
- Updated
- Jun 16, 2026
- EPSS
- 0.5% · 40th percentile
- CWE
- CWE-400
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Report tools
Action score
13
Monitor
Low priority for now.
- CVSS
- 13 / 40 · 3.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| unzip project | unzip | cpe:2.3:a:unzip_project:unzip |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux8.0
- unzip project unzip6.0
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 | unzip | before 6.0-r6 | 6.0-r6 |
| Alpine:v3.12 | unzip | before 6.0-r7 | 6.0-r7 |
| Debian:12 | unzip | before 6.0-24 | 6.0-24 |
| Debian:8 | unzip | before 6.0-16+deb8u4 | 6.0-16+deb8u4 |
| Red Hat:enterprise_linux:7::client | unzip | before 0:6.0-21.el7 | 0:6.0-21.el7 |
| Red Hat:enterprise_linux:7::client | unzip-debuginfo | before 0:6.0-21.el7 | 0:6.0-21.el7 |
| Red Hat:enterprise_linux:8::baseos | unzip | before 0:6.0-43.el8 | 0:6.0-43.el8 |
| Red Hat:enterprise_linux:8::baseos | unzip-debuginfo | before 0:6.0-43.el8 | 0:6.0-43.el8 |
| Red Hat:enterprise_linux:8::baseos | unzip-debugsource | before 0:6.0-43.el8 | 0:6.0-43.el8 |
| Red Hat:rhel_eus:7.7::computenode | unzip | before 0:6.0-20.el7_7.1 | 0:6.0-20.el7_7.1 |
| Red Hat:rhel_eus:7.7::computenode | unzip-debuginfo | before 0:6.0-20.el7_7.1 | 0:6.0-20.el7_7.1 |
Same product
unzip project: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-1000035A heap-based buffer overflow exists in Info-Zip UnZip version <= 6.00 in the processing of password-protected archives that allows an attack40Plan
- CVE-2020-36561Path traversal in github.com/yi-ge/unzip36Monitor
- CVE-2014-8141Heap-based buffer overflow in the getZip64Data function in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute arbitrary code 33Monitor
- CVE-2014-8140Heap-based buffer overflow in the test_compr_eb function in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute arbitrary code33Monitor
- CVE-2014-8139Heap-based buffer overflow in the CRC32 verification in Info-ZIP UnZip 6.0 and earlier allows remote attackers to execute arbitrary code via33Monitor
- CVE-2014-9636unzip 6.0 allows remote attackers to cause a denial of service (out-of-bounds read or write and crash) via an extra field with an uncompress24Monitor
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:unzip | 6.0-r6 · Alpine:v3.10 | Package registry (OSV) |
| debian:unzip | 6.0-24 · Debian:12 | Package registry (OSV) |
| red hat:unzip | 0:6.0-21.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:unzip-debuginfo | 0:6.0-21.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:unzip-debugsource | 0:6.0-43.el8 · Red Hat:enterprise_linux:8::baseos | 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.
No commit or PR link among the references.
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
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-400 · Uncontrolled Resource ConsumptionCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
nvd-primary
Root cause
Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.
The bug in code
The whole CWE-400 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
function expand(node) { return node.children.map(expand);}Fixed
const MAX_DEPTH = 32;function expand(node, depth = 0) { if (depth > MAX_DEPTH) throw new Error("too deep"); return node.children.map((c) => expand(c, depth + 1));}Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/madler/unzip
- lists.debian.org/debian-lts-announce/2019/07/msg00005.html
- lists.debian.org/debian-lts-announce/2019/07/msg00027.html
- security.gentoo.org/glsa/202003-58
- security.netapp.com/advisory/ntap-20190814-0002/
- support.f5.com/csp/article/K80311892?utm_source=f5support&%3Butm_medium=RSS
- www.bamsoftware.com/hacks/zipbomb/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.