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Fencer Vulns
medium 4.8

CVE-2021-23346 json

Regular Expression Denial of Service (ReDoS)

published 2021-03-04 5 y ago modified 2026-06-17 4 mo ago also GHSA-545q-3fg6-48m7 , EUVD-2021-0605

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

This affects the package html-parse-stringify before 2.0.1; all versions of package html-parse-stringify2. Sending certain input could cause one of the regular expressions that is used for parsing to backtrack, freezing the process.

Patch / fix

  • npm html-parse-stringify 2.0.1
  • n/a html-parse-stringify 2.0.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-23346 updated cvss 4.3

html-parse-stringify: Regular Expression DoS

  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/search-ui-rhel8
    affected: no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/console-rhel8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.13% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY-1079306 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JS-HTMLPARSESTRINGIFY2-1079307 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1080633 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:R
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
npm html-parse-stringify
<2.0.1
2.0.1
npm html-parse-stringify2
<=2.0.1
 no fix listed

Affected products

  • n/a html-parse-stringify
  • n/a html-parse-stringify2

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.