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4 vulnerabilities found for webpack-dev-middleware by webpack
CVE-2026-76844 (GCVE-0-2026-76844)
Vulnerability from nvd – Published: 2026-08-24 13:12 – Updated: 2026-10-01 11:03
VLAI
EPSS
VEX
Title
zlib 1.2.11 through 1.3.2 Heap Buffer Overflow via Stale gzwrite Pointer After Failed Write
Summary
zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.
Severity
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-787 - Out-of-bounds Write
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://gist.github.com/thesmartshadow/e0b9481792… | technical-descriptionexploit |
| https://github.com/madler/zlib/commit/df84af25dc1… | patch |
| https://github.com/madler/zlib/blob/v1.3.2/gzwrit… | technical-description |
| https://github.com/madler/zlib | product |
| https://www.vulncheck.com/advisories/zlib-1.3.1.2… | third-party-advisory |
Impacted products
Date Public
2026-09-02 00:00
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CVE-2024-29180 (GCVE-0-2024-29180)
Vulnerability from nvd – Published: 2024-03-21 16:47 – Updated: 2024-08-02 14:58
VLAI
EPSS
VEX
Title
webpack-dev-middleware Path Traversal vulnerability
Summary
Prior to versions 7.1.0, 6.1.2, and 5.3.4, the webpack-dev-middleware development middleware for devpack does not validate the supplied URL address sufficiently before returning the local file. It is possible to access any file on the developer's machine. The middleware can either work with the physical filesystem when reading the files or it can use a virtualized in-memory `memfs` filesystem. If `writeToDisk` configuration option is set to `true`, the physical filesystem is used. The `getFilenameFromUrl` method is used to parse URL and build the local file path. The public path prefix is stripped from the URL, and the `unsecaped` path suffix is appended to the `outputPath`. As the URL is not unescaped and normalized automatically before calling the midlleware, it is possible to use `%2e` and `%2f` sequences to perform path traversal attack.
Developers using `webpack-dev-server` or `webpack-dev-middleware` are affected by the issue. When the project is started, an attacker might access any file on the developer's machine and exfiltrate the content. If the development server is listening on a public IP address (or `0.0.0.0`), an attacker on the local network can access the local files without any interaction from the victim (direct connection to the port). If the server allows access from third-party domains, an attacker can send a malicious link to the victim. When visited, the client side script can connect to the local server and exfiltrate the local files. Starting with fixed versions 7.1.0, 6.1.2, and 5.3.4, the URL is unescaped and normalized before any further processing.
Severity
7.4 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-02 14:55 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_CONFIRM |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| webpack | webpack-dev-middleware |
Affected:
>= 7.0.0, < 7.1.0
Affected: >= 6.0.0, < 6.1.2 Affected: < 5.3.4 |
|
| webpack.js | webpack-dev-middleware |
Affected:
0 , < 5.3.4
(custom)
Affected: 6.0.0 , < 6.1.2 (custom) Affected: 7.0.0 , < 7.1.0 (custom) cpe:2.3:a:webpack.js:webpack-dev-middleware:*:*:*:*:*:*:*:* |
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CVE-2026-76844 (GCVE-0-2026-76844)
Vulnerability from cvelistv5 – Published: 2026-08-24 13:12 – Updated: 2026-10-01 11:03
VLAI
EPSS
VEX
Title
zlib 1.2.11 through 1.3.2 Heap Buffer Overflow via Stale gzwrite Pointer After Failed Write
Summary
zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.
Severity
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-787 - Out-of-bounds Write
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://gist.github.com/thesmartshadow/e0b9481792… | technical-descriptionexploit |
| https://github.com/madler/zlib/commit/df84af25dc1… | patch |
| https://github.com/madler/zlib/blob/v1.3.2/gzwrit… | technical-description |
| https://github.com/madler/zlib | product |
| https://www.vulncheck.com/advisories/zlib-1.3.1.2… | third-party-advisory |
Impacted products
Date Public
2026-09-02 00:00
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CVE-2024-29180 (GCVE-0-2024-29180)
Vulnerability from cvelistv5 – Published: 2024-03-21 16:47 – Updated: 2024-08-02 14:58
VLAI
EPSS
VEX
Title
webpack-dev-middleware Path Traversal vulnerability
Summary
Prior to versions 7.1.0, 6.1.2, and 5.3.4, the webpack-dev-middleware development middleware for devpack does not validate the supplied URL address sufficiently before returning the local file. It is possible to access any file on the developer's machine. The middleware can either work with the physical filesystem when reading the files or it can use a virtualized in-memory `memfs` filesystem. If `writeToDisk` configuration option is set to `true`, the physical filesystem is used. The `getFilenameFromUrl` method is used to parse URL and build the local file path. The public path prefix is stripped from the URL, and the `unsecaped` path suffix is appended to the `outputPath`. As the URL is not unescaped and normalized automatically before calling the midlleware, it is possible to use `%2e` and `%2f` sequences to perform path traversal attack.
Developers using `webpack-dev-server` or `webpack-dev-middleware` are affected by the issue. When the project is started, an attacker might access any file on the developer's machine and exfiltrate the content. If the development server is listening on a public IP address (or `0.0.0.0`), an attacker on the local network can access the local files without any interaction from the victim (direct connection to the port). If the server allows access from third-party domains, an attacker can send a malicious link to the victim. When visited, the client side script can connect to the local server and exfiltrate the local files. Starting with fixed versions 7.1.0, 6.1.2, and 5.3.4, the URL is unescaped and normalized before any further processing.
Severity
7.4 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-02 14:55 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_CONFIRM |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
| https://github.com/webpack/webpack-dev-middleware… | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| webpack | webpack-dev-middleware |
Affected:
>= 7.0.0, < 7.1.0
Affected: >= 6.0.0, < 6.1.2 Affected: < 5.3.4 |
|
| webpack.js | webpack-dev-middleware |
Affected:
0 , < 5.3.4
(custom)
Affected: 6.0.0 , < 6.1.2 (custom) Affected: 7.0.0 , < 7.1.0 (custom) cpe:2.3:a:webpack.js:webpack-dev-middleware:*:*:*:*:*:*:*:* |
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