CVE-2026-108262VulnerabilityPublished 9 Nov 2026

github.com/ddev/ddev · DDEV incomplete tar symlink traversal fix allows host file overwrite - Incomplete fix of CVE-2026-32885

Affects github.com/ddev/ddevSource GCVE Database

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Mentioned vulnerabilities

CVE-2026-32885

Authoritative record:CVE-2026-108262· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium : upgrade to 1.25.4 when convenient.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (GitHub_M)	CVSS 3.1	6.5

EPSS: 0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.25.4

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade github.com/ddev/ddev to 1.25.4.

Affected software

Product	Affected	Fixed in
Gogithub.com/ddev/ddev	Affected <1.25.4	Fixed in 1.25.4

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available in version 1.25.4 of github.com/ddev/ddev that fixes this vulnerability. Users should upgrade to version 1.25.4 or later to remediate the issue. The fix involves rejecting absolute symlink targets or properly validating the raw symlink target before creation, and resolving symlinks during file extraction to prevent traversal attacks. Until upgraded, users should avoid extracting untrusted tar archives with ddev's Untar functionality. No other mitigations are specified by the vendor advisory.

Description

A vulnerability in the Untar function of github.com/ddev/ddev prior to version 1.25.4 allows an attacker to overwrite arbitrary host files via crafted tar archives containing absolute symlink targets. The flaw arises because the symlink target validation rebases absolute paths into the extraction directory for checking but creates symlinks using the raw absolute target, enabling escape from the intended extraction directory. This can lead to overwriting critical files such as shell rc-files, potentially resulting in remote code execution.

Impact

An attacker can craft a malicious tar archive that, when extracted by the vulnerable Untar function, creates absolute symlinks pointing outside the extraction directory. This allows subsequent files in the archive to overwrite arbitrary files on the host system, including sensitive configuration files such as shell rc-files, git hooks, or cron entries. Overwriting these files can lead to remote code execution under the victim's user context. The vulnerability has a high severity with a CVSS score of 8.8, reflecting its potential for complete confidentiality, integrity, and availability compromise without requiring privileges or user interaction beyond triggering extraction.

Summary

The vulnerability (CVE-2026-108262) is an incomplete fix for CVE-2026-32885 in the Untar function of github.com/ddev/ddev. The fix added a symlink-target escape check that rebases absolute symlink targets into the destination directory before validation, causing the check to pass incorrectly. However, the symlink is created with the raw absolute target, allowing a malicious archive to plant a host-absolute symlink. Subsequent file entries can then write through this symlink to overwrite arbitrary host files outside the extraction directory. This was confirmed by tests showing files written outside the destination directory and overwriting existing host files. The vulnerability affects versions before 1.25.4 and is exploitable via ddev add-on get and import commands. The recommended fix is to reject absolute symlink targets outright or validate the raw symlink target that will be created, and to resolve symlinks when validating file entries to prevent traversal through planted symlinks.

CWE-22Improper Limitation of a Pathname to a Restricted Directory (Path Traversal) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #6OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks…
Implementation · Input Validation
Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174).
OWASP Cheat Sheets
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.3.1 (opens in a new tab)
Attack patterns
Path Traversal (opens in a new tab)
Using Slashes and URL Encoding Combined to Bypass Validation Logic (opens in a new tab)
Manipulating Web Input to File System Calls (opens in a new tab)
Using Escaped Slashes in Alternate Encoding (opens in a new tab)
Using Slashes in Alternate Encoding (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-59Improper Link Resolution Before File Access (Link Following) (opens in a new tab)
Base weaknessLikelihood of exploit: MediumOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
Architecture and Design · Separation of Privilege
Follow the principle of least privilege when assigning access rights to entities in a software system.
OWASP Cheat Sheets
Authorization (opens in a new tab)
Attack patterns
Symlink Attack (opens in a new tab)
Using Malicious Files (opens in a new tab)
Leverage Executable Code in Non-Executable Files (opens in a new tab)
Manipulating Web Input to File System Calls (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Nov 2026, 23:20 UTC

WeaknessesCWE-22, CWE-59

Technical details

References

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