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CVE-2020-26256

22
FAUCET Score

CVE-2020-26256 describes a Regular Expression Denial of Service (ReDoS) vulnerability in the 'fast-csv' npm package, specifically affecting versions prior to 4.3.6 when the 'ignoreEmpty' parsing option is utilized. With a CVSS score of 6.5 (Medium), this vulnerability can lead to a denial of service (A:H) with low attack complexity (AC:L) and no user interaction required (UI:N), though it requires some level of privileges (PR:L). There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.3.6CPE matchmatch criteria
cpe:2.3:a:c2fo:fast-csv:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.7MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.1
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.52%
Probability of exploitation in next 30 days
EPSS Percentile
71.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0152 is in the 85th percentile among its peer group of 21,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: fast-csvFixed in: 4.3.6
npmpatch availablevia ghsa
Product: @fast-csv/parseFixed in: 4.3.6

Vendor Advisories (1)

npmGHSA-8cv5-p934-3hwplow

Denial of service in fast-csv

Dec 8, 2020

References

github.com / C2FO/fast-csv/commit/4bbd39f26a8cd7382151ab4f5fb102234b2f829e
PatchThird Party Advisory
github.com / C2FO/fast-csv/issues/540
Third Party Advisory
github.com / C2FO/fast-csv/security/advisories/GHSA-8cv5-p934-3hwp
Third Party Advisory
lgtm.com / query/8609731774537641779
ExploitThird Party Advisory
npmjs.com / package/%40fast-csv/parse
npmjs.com / package/fast-csv
ProductThird Party Advisory