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7 vulnerabilities by pillarjs
CVE-2026-4923 (GCVE-0-2026-4923)
Vulnerability from cvelistv5 – Published: 2026-03-26 19:02 – Updated: 2026-03-27 13:58
VLAI?
Title
path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards
Summary
Impact:
When using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path.
Unsafe examples:
/*foo-*bar-:baz
/*a-:b-*c-:d
/x/*a-:b/*c/y
Safe examples:
/*foo-:bar
/*foo-:bar-*baz
Patches:
Upgrade to version 8.4.0.
Workarounds:
If you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.
Severity ?
5.9 (Medium)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| path-to-regexp | path-to-regexp |
Affected:
8.0.0 , < 8.4.0
(semver)
Unaffected: 8.4.0 (semver) |
Credits
blakeembrey
UlisesGascon
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CVE-2026-4926 (GCVE-0-2026-4926)
Vulnerability from cvelistv5 – Published: 2026-03-26 18:59 – Updated: 2026-03-27 19:44
VLAI?
Title
path-to-regexp vulnerable to Denial of Service via sequential optional groups
Summary
Impact:
A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service.
Patches:
Fixed in version 8.4.0.
Workarounds:
Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.
Severity ?
7.5 (High)
CWE
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| path-to-regexp | path-to-regexp |
Affected:
8.0.0 , < 8.4.0
(semver)
Unaffected: 8.4.0 (semver) |
Credits
uug4na
blakeembrey
UlisesGascon
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CVE-2026-4867 (GCVE-0-2026-4867)
Vulnerability from cvelistv5 – Published: 2026-03-26 16:16 – Updated: 2026-03-26 16:52
VLAI?
Title
path-to-regexp vulnerable to Regular Expression Denial of Service via multiple route parameters
Summary
Impact:
A bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). For example, /:a-:b-:c or /:a-:b-:c-:d. The backtrack protection added in path-to-regexp@0.1.12 only prevents ambiguity for two parameters. With three or more, the generated lookahead does not block single separator characters, so capture groups overlap and cause catastrophic backtracking.
Patches:
Upgrade to path-to-regexp@0.1.13
Custom regex patterns in route definitions (e.g., /:a-:b([^-/]+)-:c([^-/]+)) are not affected because they override the default capture group.
Workarounds:
All versions can be patched by providing a custom regular expression for parameters after the first in a single segment. As long as the custom regular expression does not match the text before the parameter, you will be safe. For example, change /:a-:b-:c to /:a-:b([^-/]+)-:c([^-/]+).
If paths cannot be rewritten and versions cannot be upgraded, another alternative is to limit the URL length.
Severity ?
7.5 (High)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| path-to-regexp | path-to-regexp |
Affected:
0 , < 0.1.13
(semver)
|
Credits
EthanKim88
blakeembrey
UlisesGascon
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CVE-2024-52798 (GCVE-0-2024-52798)
Vulnerability from cvelistv5 – Published: 2024-12-05 22:45 – Updated: 2025-01-24 20:03
VLAI?
Title
path-to-regexp Unpatched `path-to-regexp` ReDoS in 0.1.x
Summary
path-to-regexp turns path strings into a regular expressions. In certain cases, path-to-regexp will output a regular expression that can be exploited to cause poor performance. The regular expression that is vulnerable to backtracking can be generated in the 0.1.x release of path-to-regexp. Upgrade to 0.1.12. This vulnerability exists because of an incomplete fix for CVE-2024-45296.
Severity ?
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
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Affected:
< 0.1.12
|
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CVE-2024-43799 (GCVE-0-2024-43799)
Vulnerability from cvelistv5 – Published: 2024-09-10 14:45 – Updated: 2025-11-03 19:30
VLAI?
Title
send vulnerable to template injection that can lead to XSS
Summary
Send is a library for streaming files from the file system as a http response. Send passes untrusted user input to SendStream.redirect() which executes untrusted code. This issue is patched in send 0.19.0.
Severity ?
5 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
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CVE-2024-45296 (GCVE-0-2024-45296)
Vulnerability from cvelistv5 – Published: 2024-09-09 19:07 – Updated: 2025-01-24 20:03
VLAI?
Title
path-to-regexp outputs backtracking regular expressions
Summary
path-to-regexp turns path strings into a regular expressions. In certain cases, path-to-regexp will output a regular expression that can be exploited to cause poor performance. Because JavaScript is single threaded and regex matching runs on the main thread, poor performance will block the event loop and lead to a DoS. The bad regular expression is generated any time you have two parameters within a single segment, separated by something that is not a period (.). For users of 0.1, upgrade to 0.1.10. All other users should upgrade to 8.0.0.
Severity ?
7.5 (High)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| pillarjs | path-to-regexp |
Affected:
< 0.1.10
Affected: >= 0.2.0, < 8.0.0 |
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CVE-2021-32822 (GCVE-0-2021-32822)
Vulnerability from cvelistv5 – Published: 2021-08-16 18:45 – Updated: 2024-08-03 23:33
VLAI?
Title
File disclosure in hbs
Summary
The npm hbs package is an Express view engine wrapper for Handlebars. Depending on usage, users of hbs may be vulnerable to a file disclosure vulnerability. There is currently no patch for this vulnerability. hbs mixes pure template data with engine configuration options through the Express render API. By overwriting internal configuration options a file disclosure vulnerability may be triggered in downstream applications. For an example PoC see the referenced GHSL-2021-020.
Severity ?
4 (Medium)
CWE
- CWE-538 - File and Directory Information Exposure
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
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