Denial of service in fast-csv

CVE-2020-26256 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Impact

Possible ReDoS (Regular Expression Denial of Service) when using ignoreEmpty option when parsing.

Patches

This has been patched in v4.3.6

Workarounds

You will only be affected by this if you use the ignoreEmpty parsing option. If you do use this option it is recommended that you upgrade to the latest version v4.3.6

References

This vulnerability was found using a CodeQL query which identified EMPTY_ROW_REGEXP regular expression as vulnerable.
Link to query run.

For more information

If you have any questions or comments about this advisory:
* Open an issue in fast-csv

Basic information

Type
reviewed
Severity
low
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2020-12-08 21:42:53 UTC
Updated
2023-02-01 05:05:04 UTC
GitHub reviewed
2020-12-08 21:42:31 UTC
NVD published
2020-12-08

EPSS Score

Score Percentile
1.07% 77.50%

CVSS Scores

Base score Version Severity Vector
5.7 3.1 —
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-8cv5-p934-3hwp ↗
CVE CVE-2020-26256 ↗

CWEs

CWE id Name
CWE-400 Uncontrolled Resource Consumption

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm fast-csv < 4.3.6 4.3.6 —
npm @fast-csv/parse < 4.3.6 4.3.6 —

References

cvelogic Threat Intelligence