What is CVE-2021-29059?

CVE-2021-29059 is a high-severity vulnerability in Is-Svg Project, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2021-06-21.

How severe is CVE-2021-29059?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Is-Svg Project

CVE-2021-29059

A vulnerability was discovered in IS-SVG version 2.1.0 to 4.2.2 and below where a Regular Expression Denial of Service (ReDOS) occurs if the application is provided and checks a crafted invalid SVG string.

Published 2021-06-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.026 (85.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.028 · newest: 0.026 · change: -0.002

Affected products

Is-Svg Project

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

www.npmjs.com/package/is-svg (Product)
github.com/yetingli/SaveResults/blob/main/js/is-svg.js (Third Party Advisory)
github.com/sindresorhus/is-svg/releases/tag/v4.3.0 (Third Party Advisory, Release Notes)
github.com/yetingli/PoCs/blob/main/CVE-2021-29059/IS-SVG.md (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29059?: CVE-2021-29059 is a high-severity vulnerability in Is-Svg Project, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2021-06-21.
How severe is CVE-2021-29059?: High severity. CVSS v3 base score is 7.5 out of 10.