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CVE-2026-46644

MEDIUM
6.9
CVSS 4.0
Description
Symfony Polyfill backports PHP features and provides compatibility layers for extensions and functions. From 1.17.1 until 1.38.1, symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload is empty or decodes to ASCII-only code points because Idn::process() does not enforce the UTS #46 revision 33 requirement that decoded ACE labels contain at least one non-ASCII code point. Originally unequal domain names can be regarded as equal, which can lead to blacklist bypassing, inconsistent URL parsing, and server-side request forgery in applications using the polyfill to canonicalise or compare hostnames. This issue is fixed in version 1.38.1.

Metadata

CVE ID
CVE-2026-46644
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-15 20:11 UTC
Published
2026-07-14 20:48 UTC
Last updated
2026-07-15 12:52 UTC
Primary CWE
CWE-1289
CWE-1289: Improper Validation of Unsafe Equivalence in Input
Vendor / Product
symfony / polyfill
Sources
cve.org  ·  NVD

Severity & Metrics

6.9 MEDIUM CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (2)
VendorProductPlatformVersions
symfony polyfill — >= 1.17.1, < 1.38.1
symfony polyfill-intl-idn — >= 1.17.1, < 1.38.1
Weakness (CWE)
CWESourceDescription
CWE-1289 cna CWE-1289: Improper Validation of Unsafe Equivalence in Input
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.9 MEDIUM 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
References (3)
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