CVE-2026-73490
No exploitation reported by the sources we read.
- Published2026-08-12
- Fixed in2.25.2
- WeaknessCWE-79
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.2, Loofah's HTML5 sanitizer applies its local-reference restriction only to the xlink:href attribute on SVG use and feImage elements, while browsers also accept the plain href attribute. A crafted sanitized SVG can therefore reference an arbitrary same-origin external document; use may render external SVG content containing scripts or other dangerous content, and feImage may load external images for tracking. Applications that sanitize user-supplied SVG with Loofah's default allowlist are affected. This issue is fixed in version 2.25.2.
Timeline
dates in UTC- 2026-08-1221:17CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-73490?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-73490?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.25 | < 2.25.2 | 2.25.2 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
loofah: Loofah: SVG `href` attribute bypasses local-reference restriction
3scale-amp2/system-rhel8 as a component of Red Hat 3scale API Management Platform 2 · 3scale-amp2/system-rhel9 as a component of Red Hat 3scale API Management Platform 2 · 3scale-amp2/zync-rhel9 as a component of Red Hat 3scale API Management Platform 2 · +4 more
Fix
- Update loofah to 2.25.2
- Workaround from the vendor Red Hat Product Security CVE-2026-73490 · 7 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- No fix available, says the vendor Red Hat Product Security CVE-2026-73490 · 7 productsFix deferred
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- Published
- 2026-08-12
- Last Modified
- 2026-09-09
- NVD status
- Awaiting Analysis
Frequently asked questions
What is CVE-2026-73490?
Is CVE-2026-73490 actively exploited?
What is the CVSS score for CVE-2026-73490?
Running loofah? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.