Vulnerability · Published Oct 2, 2026 · Assigned by GitHub_M

CVE-2026-104861probe-image-size: Quadratic-time Denial of Service in the SVG Parser

High 7.5

In plain English

A high-severity uncontrolled resource consumption in probe-image-size from nodeca. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 63.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	probe-image-size	7.4.0	GHSA-gjj5-9665-rwrc

Affected products (as reported)

Vendor	Product	Versions
nodeca	probe-image-size	< 7.4.0

Weakness: CWE-400, CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/nodeca/probe-image-size/security/advisories/GHSA-gjj5-9665-rwrc x_refsource_CONFIRM
https://github.com/nodeca/probe-image-size/commit/60cc96ac0b671e79e328213d0a8e831312b09e84 x_refsource_MISC
https://github.com/nodeca/probe-image-size/commit/9b74656d6f973cc59ea2ab1375c0d88390a402ad x_refsource_MISC
https://github.com/nodeca/probe-image-size/commit/c032aefabdecf5cb50548ab9ba175db56353078f x_refsource_MISC
https://github.com/nodeca/probe-image-size/releases/tag/7.4.0 x_refsource_MISC