CVE-2026-76844 (GCVE-0-2026-76844)

Vulnerability from cvelistv5 – Published: 2026-08-24 13:12 – Updated: 2026-08-26 18:22
VLAI
Title
webpack-dev-middleware Path Traversal via Offset Slice on a Non-Slash-Terminated publicPath
Summary
webpack-dev-middleware resolves a request to a local file in getFilenameFromUrl by testing the request pathname against a traversal guard and then slicing it at a fixed character offset. The guard, UP_PATH_REGEXP applied to path.normalize(`./${pathname}`), only matches ".." that stands as a whole path segment, while the containment test is the string comparison pathname.startsWith(publicPathPathname) and the file path is built as path.join(outputPath, pathname.slice(publicPathPathname.length)). When the configured publicPath has no trailing slash, a request such as GET /assets../.env against publicPath /assets yields the pathname /assets../.env, whose only dot-dot sits inside the segment "assets.." and so passes the guard, but the offset slice cuts within that segment and hands "../.env" to path.join, resolving one directory above outputPath. Reading a file from that path requires the middleware to be backed by the physical filesystem, which happens when writeToDisk is true or a custom outputFileSystem is supplied, since the default memfs volume holds only build output. Traversal depth is limited to a single directory because a separately delimited dot-dot segment is collapsed during URL parsing before the guard runs. The default publicPath value of "auto" resolves to "/" and is not affected. This is an incomplete fix for CVE-2024-29180: the guard and offset slice were introduced by that fix and are present in every release from 5.3.4, 6.1.2 and 7.1.0 onward.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
7.4 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 18:22 UTC
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
Vendor Product Version CPE status
webpack webpack-dev-middleware Affected: 5.3.4 , ≤ 5.3.4 (semver)
Affected: 6.1.2 , ≤ 6.1.3 (semver)
Affected: 7.1.0 , ≤ 7.4.5 (semver)
Affected: 8.0.0 , ≤ 8.1.1 (semver)
    cpe:2.3:a:webpack.js:webpack-dev-middleware:*:*:*:*:*:*:*:*
    cpe:2.3:a:webpack.js:webpack-dev-middleware:*:*:*:*:*:*:*:*
    cpe:2.3:a:webpack.js:webpack-dev-middleware:*:*:*:*:*:*:*:*
    cpe:2.3:a:webpack.js:webpack-dev-middleware:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-20 00:00
Credits
Muhammad Sobirov
Show details on NVD website
To clipboard 

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  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.