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Canonical Apport EUVDEUVD-2026-63758

| CVE-2026-77113 MEDIUM
Relative Path Traversal (CWE-23)
2026-08-20 canonical GHSA-m4rr-rf2f-g267
Path Traversal Canonical Apport
6.7
CVSS 4.0 · Vendor: canonical
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Severity by source

Vendor (canonical) PRIMARY
6.7 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/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
vuln.today AI
5.5 MEDIUM

Local delivery and explicit user execution of apport-unpack required (UI:R, AV:L); no privileges needed to craft the report (PR:N); impact is integrity-only, no confidentiality or availability effect.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (canonical).

CVSS VectorVendor: canonical

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/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
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 20, 2026 - 23:23 vuln.today
Analysis Generated
Aug 20, 2026 - 23:23 vuln.today
CVE Published
Aug 20, 2026 - 22:32 cve.org
MEDIUM 6.7

DescriptionCVE.org

Path traversal in apport-unpack in Canonical Apport before 2.36.0, 2.34.2, and 2.28.4 on Linux allows an attacker to create or overwrite arbitrary files with the privileges of the executing user via an attacker controlled key names in crash report files.

AnalysisAI

Path traversal in the apport-unpack utility of Canonical Apport enables arbitrary file creation and overwrite by exploiting attacker-controlled key names embedded in crafted crash report files. Affected versions span all Apport releases before 2.28.4, 2.34.2, and 2.36.0 - software that ships by default with Ubuntu desktop and server editions. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft .crash report with path-traversal key names
Delivery
Deliver malicious report to target system
Exploit
Induce victim or pipeline to invoke apport-unpack
Execution
Trigger traversal during key-to-filename mapping
Impact
Write attacker-controlled content to arbitrary filesystem path
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target user or an automated process execute `apport-unpack` against an attacker-supplied `.crash` report file in which one or more key names contain path traversal sequences (forward slashes forming relative paths such as `../../`). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.7 with vector AV:L/AC:L/AT:N/PR:N/UI:A accurately reflects the attack characteristics: local delivery of a malicious crash report with required active user interaction meaningfully constrains exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a `.crash` report file containing key names with embedded path traversal sequences such as `../../.config/autostart/persistence.desktop` and delivers it to a developer's Ubuntu workstation via a shared network directory, a compromised package, or social engineering. The developer or an automated crash-processing pipeline invokes `apport-unpack` against the file, causing Apport to write attacker-controlled content to the traversed path with the developer's filesystem privileges, potentially establishing persistence or overwriting sensitive configuration files.
Remediation Upgrade Apport to version 2.36.0, 2.34.2 (for the 2.34.x branch), or 2.28.4 (for the 2.28.x branch) by applying the upstream fix from GitHub PR https://github.com/canonical/apport/pull/646. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-63758 vulnerability details – vuln.today
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