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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Svg-Sanitizer_Project Svg-Sanitizer
cpe:2.3:a:svg-sanitizer_project:svg-sanitizer:*:*:*:*:*:*:*:*
|
0.5.3
|
1.1.0
|
References 3
https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-2v7c-jx29…
GitHub Security Advisory (GHSA-2v7c-jx29-jprp)
https://github.com/darylldoyle/svg-sanitizer/commit/9ba9001493f5da737759303f13b…
NVD
https://www.vulncheck.com/advisories/svg-sanitizer-before-1.1.0-quadratic-cpu-e…
VulnCheck Advisory: svg-sanitizer before 1.1.0 Quadratic CPU-Exhaustion DoS via PHP-Tag Stripping Loop