PT-2026-44140 · Symfony · Dom-Crawler

CVE-2026-45071 · Published 2026-05-21 · Updated 2026-07-17

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions symfony/dom-crawler (affected versions not specified)

Description The Crawler::addXmlContent() function in symfony/dom-crawler sets DOMDocument::$validateOnParse to true before calling loadXML(). This action re-enables libxml's DTD subset processing, which allows for external entity resolution. While LIBXML NONET is used to block network fetches, it does not prevent the resolution of file:// entities. Consequently, an attacker can provide a crafted XML document containing a SYSTEM "file:///etc/passwd" entity to achieve local file disclosure.

Recommendations Update to a version where the Crawler::addXmlContent() method no longer sets the validateOnParse flag.

Exploit

Fix

XXE

Weakness Enumeration

CWE-611

Related Identifiers

CVE-2026-45071

GHSA-X6G4-FWCC-JJ8W

Affected Products

Dom-Crawler

References · 21

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45071.json · Exploit
• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45071.yaml · Exploit
• 🔥 https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/dom-crawler/CVE-2026-45071.yaml · Exploit
• https://github.com/symfony/symfony/commit/eea5fd7488cbdc241da4ce242344b7d9a3ecdf3d · Patch
• https://github.com/symfony/symfony/security/advisories/GHSA-x6g4-fwcc-jj8w · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-45071 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-45071 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-45071 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-45071 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-45071 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-45071 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-45071 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-x6g4-fwcc-jj8w · Vendor Advisory
• https://github.com/symfony/symfony/releases/tag/v5.4.52 · Note
• https://github.com/symfony/symfony/releases/tag/v6.4.40 · Note