CVE-2026-121445Proof of concept (PoC) published · CISA

svg-sanitizer 1.0.0 before 1.1.0 ReDoS and Fail-Open via image-set CSS Stripping

CVSS score

8.2

EPSS probability

—

Risk score

0.8

Published

5 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

Checking session…

Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-121445: ReDoS and Fail-Open Vulnerability in darylldoyle svg-sanitizer

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

darylldoyle svg-sanitizer from version 1.0.0 before 1.1.0 contains a regular expression denial of service and fail-open vulnerability within the image-set pattern of stripRemoteCssTokens() [S0].

Why does it matter?

When removeRemoteReferences is enabled, attackers can exhaust CPU resources or cause sanitize() to throw an error, leaving content unsanitized [S0].

What should be done?

Follow official vendor advisories [S0]
Update the svg-sanitizer package [S0]
Review removeRemoteReferences configurations [S0]

Chain of evidence and sources2 verified claims

svg-sanitizer 1.0.0 ile 1.1.0 sürümleri arasında ReDoS ve fail-open zafiyeti bulunmaktadır [S0].

S0 · daybreach-canonical S1 · cvelist

Zafiyet removeRemoteReferences etkinleştirildiğinde tetiklenebilmektedir [S0].

S0 · daybreach-canonical S1 · cvelist

Show the technical text from the sources

darylldoyle svg-sanitizer from 1.0.0 before 1.1.0 contains a regular expression denial of service vulnerability in the image-set pattern of stripRemoteCssTokens() when removeRemoteReferences is enabled. Attackers can submit SVGs with many unclosed image-set tokens to exhaust CPU, or trigger PCRE limits causing sanitize() to throw a TypeError and leave unsanitized content.

CVSS vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE: CWE-754

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-121445 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	darylldoyle	svg-sanitizer	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
8.2	CVSS V40	HIGH	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD
8.2	CVSS V4_0	HIGH	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CVE CNA
5.9	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD
5.9	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-121445 is associated with the following CWEs:

CWE-754: Common Weakness Enumeration Entry CWE-754

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-121445 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

GitHub Security Advisory (GHSA-94x8-pw3c-6qcq)vendor-advisory VulnCheck Advisory: svg-sanitizer 1.0.0 before 1.1.0 ReDoS and Fail-Open via image-set CSS Strippingvendor-advisory

CVSS Vector Radar Chart

8.2 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)High

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

darylldoyle

Weakness Type (CWE & CAPEC)

CWE-754

Similar Vulnerabilities

8.7

CVE-2026-121444svg-sanitizer 0.11.0 before 1.1.0 Algorithmic Complexity DoS via use Reference Graph

Vendordarylldoyle Productsvg-sanitizer

Patch status unknown5 h ago

6.9

CVE-2026-121443svg-sanitizer from 1.1.0 before 1.1.1 Denial of Service via Unclosed Tag

Vendordarylldoyle Productsvg-sanitizer

Patch status unknown5 h ago

5.3

CVE-2026-121447svg-sanitizer before 1.1.0 XSS via animateTransform on Safari

Vendordarylldoyle Productsvg-sanitizer

Patch status unknown5 h ago

5.3

CVE-2026-121446svg-sanitizer 0.5.0 before 1.1.0 Incomplete url() Filtering in SVG Attributes

Vendordarylldoyle Productsvg-sanitizer

Patch status unknown5 h ago

6.5

CVE-2026-107379enshrined/svg-sanitize: Denial of Service via DTD Attribute Declaration Crash

Vendordarylldoyle Productsvg-sanitizer+2 etkilenen

Patch status unknownEPSS %126 d ago

8.7

CVE-2026-117540svg-sanitizer before 1.1.0 Quadratic CPU-Exhaustion DoS via PHP-Tag Stripping Loop

Vendordarylldoyle Productsvg-sanitizer

Patch verifiedEPSS %07 days ago

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

Get a free key Documentation

curl -H "x-api-key: $DAYBREACH_API_KEY" \
  "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-121445"

svg-sanitizer 1.0.0 before 1.1.0 ReDoS and Fail-Open via image-set CSS Stripping

Impact on My Inventory

Vulnerability description

DayBreach AI Explanation

Short explanation

What should be done?

IMPACT: Affected Products and Software

Affected Products

RED HAT CSAF/VEX: Product Impact Check

SCORING: CVSS from Multiple Sources

CVSS Scores

Patch and Remediation Guide

Solution & Remediation Advisory

Public exploit and active exploitation status

Verified exploit intelligence

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

Common Attack Pattern Enumeration and Classification (CAPEC)

Attack Vector and Accessibility

Official Sources and Advisories

CVSS Vector Radar Chart

Vulnerability Scoring Details

Weakness Type (CWE & CAPEC)

Similar Vulnerabilities

Get this vulnerability through the API

DayBreach

Glossary & Reference

Directories & Feeds

RSS & Integration