TI-2026-81116 Aliases CVE-2026-117540 GHSA-5fhv-8j9p-2v94

Quadratic CPU exhaustion in svg-sanitizer PHP tag stripping

HIGH 77CWE-407Published 2026-10-27 · Updated 2026-11-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-407.

Summary

svg-sanitizer from 0.5.3 before 1.1.0 contains a denial of service flaw in Sanitizer::sanitize() that repeatedly rescans the whole input while stripping PHP tags (CWE-407). An unauthenticated attacker can upload an SVG with many overlapping PHP tag openers and closers, forcing quadratic preg_replace passes that exhaust worker CPU for minutes. The CVSS 4.0 base score is 8.7 (HIGH), with impact limited to availability. CISA SSVC rates exploitation at the proof-of-concept level.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

svg-sanitizer from 0.5.3 before 1.1.0 contains a denial of service vulnerability in Sanitizer::sanitize() that repeatedly rescans the whole input while stripping PHP tags. Unauthenticated attackers can upload SVGs with many overlapping PHP tag openers and closers, forcing quadratic preg_replace passes that exhaust worker CPU for minutes.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00354 29th percentileScored 2026-11-07

Fix Fixed svg-sanitizer (darylldoyle): 1.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
darylldoyle	svg-sanitizer	0.5.3 to before 1.1.0	1.1.0	Patch available	CNA

svg-sanitizer Vendordarylldoyle Affected 0.5.3 to before 1.1.0 Fixed in 1.1.0 Patch available CNA

Remediation

Upgrade svg-sanitizer to version 1.1.0 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Fix · CNA svg-sanitizer (darylldoyle) Fixed in 1.1.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-27
darylldoyle svg-sanitizer 1.1.0
2 records Highest priority Priority HIGH 1 HIGH, 1 LOW
Other records, highest priority first
- TI-2026-81117 Uncaught LogicException in svg-sanitizer sanitize() enables denial of servicePriority LOW 36
Show all 2 records →

Timeline

2026-10-27 Threatist record created from CVE-2026-117540
2026-10-27 Alias added: GHSA-5fhv-8j9p-2v94
2026-10-28 Priority changed: MEDIUM → LOW
2026-11-02 CISA SSVC decision points changed
2026-11-02 Priority changed: LOW → HIGH

References

Patch 1

https://github.com/darylldoyle/svg-sanitizer/commit/9ba9001493f5da737759303f13bd965ebdaa778c

Advisory 1

GitHub Security Advisory (GHSA-2v7c-jx29-jprp)

TI-2026-84327 svg-sanitizer ReDoS and Fail-Open via image-set CSS Stripping CVSS 4.0HIGH 8.2
TI-2026-74075 Mixed-case xlink:HrEf bypasses use nesting limit in svg-sanitizer CVSS 3.1MEDIUM 6.5
TI-2026-69645 Denial of service in enshrined/svg-sanitize via crafted SVG DTD CVSS 3.1MEDIUM 6.5
TI-2026-84328 Incomplete url() filtering in svg-sanitizer allows remote URL requests CVSS 4.0MEDIUM 5.3
TI-2026-81115 darylldoyle svg-sanitizer CSS Injection and Remote Reference Bypass CVSS 4.0MEDIUM 5.1
TI-2025-34848 svg-sanitizer By-Passing Attribute Sanitization CVSS 4.0MEDIUM 5.1

See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences