GHSA-h5vq-qfcg-4m6p
Suggest an improvement- Source
- https://github.com/advisories/GHSA-h5vq-qfcg-4m6p
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-h5vq-qfcg-4m6p/GHSA-h5vq-qfcg-4m6p.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-h5vq-qfcg-4m6p
- Aliases
-
- CVE-2026-45064
- Published
- 2026-05-27T20:04:22Z
- Modified
- 2026-05-27T20:15:09.470090831Z
- Severity
-
- 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Symfony's HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing
- Details
-
Description
Symfony\Component\HtmlSanitizer\TextSanitizer\UrlSanitizer::parse()(used byUrlSanitizer::sanitize()and therefore by everyHtmlSanitizerconfig that allows links or media) accepts URLs that contain Unicode explicit-direction BiDi formatting characters: U+202A–U+202E (LRE / RLE / PDF / LRO / RLO) and U+2066–U+2069 (LRI / RLI / FSI / PDI). These characters are passed through unchanged into thehref/srcattributes produced byHtmlSanitizer. When the resulting HTML is rendered in a browser, the override characters reverse or alter the visual ordering of the URL text, so the displayed link can differ arbitrarily from the actual destination: a classic visual-spoofing / phishing primitive against viewers of sanitized content.Resolution
UrlSanitizer::parse()now rejects URLs containing the explicit-direction BiDi formatting code points (U+202A–U+202E, U+2066–U+2069) before invoking the underlying URL parser. As an unrelated companion fix in the same patch, spaces inside path/query/fragment are now percent-encoded rather than rejected outright, while spaces in the scheme/authority remain rejected by the post-encoding whitespace check.The patch for this issue is available here for branch 5.4.
Credits
Symfony would like to thank Himanshu Anand for reporting the issue and Nicolas Grekas for providing the fix.
- Database specific
{ "cwe_ids": [ "CWE-451", "CWE-1007" ], "github_reviewed": true, "github_reviewed_at": "2026-05-27T20:04:22Z", "nvd_published_at": null, "severity": "MODERATE" }- References
-
- https://github.com/symfony/symfony/security/advisories/GHSA-h5vq-qfcg-4m6p
- https://github.com/symfony/symfony/commit/743a435e948b897ef2b5564ac438d4beb95d2526
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/html-sanitizer/CVE-2026-45064.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45064.yaml
- https://github.com/symfony/symfony
- https://symfony.com/cve-2026-45064
Affected packages
Packagist
symfony/html-sanitizer
Package
- Name
- symfony/html-sanitizer
- Purl
- pkg:composer/symfony%2Fhtml-sanitizer
symfony/html-sanitizer
Package
- Name
- symfony/html-sanitizer
- Purl
- pkg:composer/symfony%2Fhtml-sanitizer
symfony/html-sanitizer
Package
- Name
- symfony/html-sanitizer
- Purl
- pkg:composer/symfony%2Fhtml-sanitizer
symfony/symfony
Package
- Name
- symfony/symfony
- Purl
- pkg:composer/symfony%2Fsymfony
Affected versions
v6.*
symfony/symfony
Package
- Name
- symfony/symfony
- Purl
- pkg:composer/symfony%2Fsymfony