Bug 2545307 (CVE-2026-104861)

Summary: CVE-2026-104861 probe-image-size: probe-image-size: Denial of Service via crafted SVG input
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: brasmith, cochase, dranck, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in probe-image-size. An unauthenticated remote attacker can exploit this vulnerability to cause a Denial of Service (DoS) by supplying specially crafted Scalable Vector Graphics (SVG) input. Due to inefficient pattern matching and input handling during SVG parsing, processing unclosed tags can consume excessive CPU resources and block the application event loop, leaving the service unresponsive.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2545976    
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Description OSIDB Bzimport 2026-10-02 18:05:48 UTC 
probe-image-size gets image dimensions without downloading the entire file. Prior to 7.4.0, lib/parse_sync/svg.js and lib/parse_stream/svg.js use the searching regular expression /<[-_.:a-zA-Z0-9][^>]*>/, which repeatedly scans to the end of input when attacker-controlled data contains many less-than characters without a closing greater-than character. The synchronous parser converts and scans the full supplied buffer without an input cap, while the streaming parser reparses the complete accumulated SVG prefix for every received chunk. The probe.sync(), probe(stream), and probe(url) entry points can therefore block the Node.js event loop at full CPU, and attacker-controlled chunking can amplify the streaming cost. This issue is fixed in version 7.4.0.