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Fencer Vulns
high 8.3

CVE-2023-50252 in the critical feed json

php-svg-lib unsafe attributes merge when parsing `use` tag

published 2023-12-12 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-55067

cvss
8.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
23.9%
EPSS 23.9% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

php-svg-lib is an SVG file parsing / rendering library. Prior to version 0.5.1, when handling `<use>` tag that references an `<image>` tag, it merges the attributes from the `<use>` tag to the `<image>` tag. The problem pops up especially when the `href` attribute from the `<use>` tag has not been sanitized. This can lead to an unsafe file read that can cause PHAR Deserialization vulnerability in PHP prior to version 8. Version 0.5.1 contains a patch for this issue.

Patch / fix

  • dompdf php-svg-lib 0.5.1
  • php-dompdf-svg-lib Debian 12 0.5.0-3+deb12u1

debian advisories DEBIAN-CVE-2023-50252

Exploit prediction

23.90% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/dompdf/php-svg-lib/security/advisories/GHSA-jq98-9543-m4cr referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • dompdf php-svg-lib

Classification

Weakness
  • CWE-15 External Control of System or Configuration Setting
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.