Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1 allows a sandbox bypass.
Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1 allows a sandbox bypass. Flatpak versions since 0.8.1 address CVE-2017-5226 by using a seccomp filter to prevent sandboxed apps from using the TIOCSTI ioctl, which could otherwise be used to inject commands into the controlling terminal so that they would be executed outside the sandbox after the sandboxed app exits. This fix was incomplete: on 64-bit platforms, the seccomp filter could be bypassed by an ioctl request number that has TIOCSTI in its 32 least significant bits and an arbitrary nonzero value in its 32 most significant bits, which the Linux kernel would treat as equivalent to TIOCSTI.
- Published
- Mar 26, 2019
- Updated
- Jun 16, 2026
- EPSS
- 1.9% · 79th percentile
- CWE
- CWE-20
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Report tools
Action score
37
Monitor
Low priority for now.
- CVSS
- 36 / 40 · 9.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 1.9%
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 |
|---|---|---|
| flatpak | flatpak | cpe:2.3:a:flatpak:flatpak |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- flatpak flatpakbefore 1.0.8
- flatpak flatpak1.1.0 and later · up to 1.1.3 inclusive
- flatpak flatpak1.2.0 and later · before 1.2.4
- flatpak flatpak1.3.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | flatpak | before 1.2.3-2 | 1.2.3-2 |
| openSUSE:Tumbleweed | flatpak | before 1.11.3-1.2 | 1.11.3-1.2 |
| Red Hat:enterprise_linux:7::client | flatpak | before 0:1.0.2-5.el7_6 | 0:1.0.2-5.el7_6 |
| Red Hat:enterprise_linux:7::client | flatpak-builder | before 0:1.0.0-5.el7_6 | 0:1.0.0-5.el7_6 |
| Red Hat:enterprise_linux:7::client | flatpak-debuginfo | before 0:1.0.2-5.el7_6 | 0:1.0.2-5.el7_6 |
| Red Hat:enterprise_linux:7::client | flatpak-devel | before 0:1.0.2-5.el7_6 | 0:1.0.2-5.el7_6 |
| Red Hat:enterprise_linux:7::client | flatpak-libs | before 0:1.0.2-5.el7_6 | 0:1.0.2-5.el7_6 |
| Red Hat:enterprise_linux:8::appstream | flatpak | before 0:1.0.6-3.el8_0 | 0:1.0.6-3.el8_0 |
| Red Hat:enterprise_linux:8::appstream | flatpak-debuginfo | before 0:1.0.6-3.el8_0 | 0:1.0.6-3.el8_0 |
| Red Hat:enterprise_linux:8::appstream | flatpak-debugsource | before 0:1.0.6-3.el8_0 | 0:1.0.6-3.el8_0 |
| Red Hat:enterprise_linux:8::appstream | flatpak-libs | before 0:1.0.6-3.el8_0 | 0:1.0.6-3.el8_0 |
| Red Hat:enterprise_linux:8::appstream | flatpak-libs-debuginfo | before 0:1.0.6-3.el8_0 | 0:1.0.6-3.el8_0 |
Same product
flatpak: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-42472Flatpak may allow access to files outside sandbox for certain apps40Plan
- CVE-2026-34078Flatpak has a complete sandbox escape leading to host file access and code execution in the host context37Monitor
- CVE-2021-21261Flatpak sandbox escape via spawn portal35Monitor
- CVE-2018-6560In dbus-proxy/flatpak-proxy.c in Flatpak before 0.8.9, and 0.9.x and 0.10.x before 0.10.3, crafted D-Bus messages to the host can be used to35Monitor
- CVE-2026-34079Flatpak affected by arbitrary file deletion on the host filesystem34Monitor
- CVE-2021-43860Permissions granted to applications can be hidden from the user at install time34Monitor
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 |
|---|---|---|
| debian:flatpak | 1.2.3-2 · Debian:12 | Package registry (OSV) |
| opensuse:flatpak | 1.11.3-1.2 · openSUSE:Tumbleweed | Package registry (OSV) |
| red hat:flatpak | 0:1.0.2-5.el7_6 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:flatpak-builder | 0:1.0.0-5.el7_6 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:flatpak-debuginfo | 0:1.0.2-5.el7_6 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:flatpak-debugsource | 0:1.0.6-3.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:flatpak-devel | 0:1.0.2-5.el7_6 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:flatpak-libs | 0:1.0.2-5.el7_6 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:flatpak-libs-debuginfo | 0:1.0.6-3.el8_0 · Red Hat:enterprise_linux:8::appstream | 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
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/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.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2019:1024
- access.redhat.com/errata/RHSA-2019:1143
- github.com/flatpak/flatpak/issues/2782
Vendor advisories and official records. Exploit/PoC links are deliberately left out.