CVE-2026-46644

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Source
https://cve.org/CVERecord?id=CVE-2026-46644
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46644.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-46644
Aliases
Downstream
Related
Published
2026-07-14T20:48:31.771Z
Modified
2026-07-17T03:41:48.024000427Z
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:L/SI:L/SA:N CVSS Calculator
Summary
symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload decodes to ASCII-only: insecure equivalence
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-1289"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46644.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/symfony/polyfill

Affected ranges

Type
GIT
Repo
https://github.com/symfony/polyfill
Events
Introduced
c36c1b42c49a5519b5424733de58412d6f387209
Fixed
1be936e2491ccebe152bd736dfc91eb1422c8bec
Fixed
09e53d15109121636a416310ea0d510bd292c463
Database specific 
{
    "extracted_events": [
        {
            "introduced": "1.17.1"
        },
        {
            "fixed": "1.38.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.17.1
v1.18.0
v1.18.1
v1.19.0
v1.20.0
v1.22.0
v1.22.1
v1.23.0
v1.23.1
v1.24.0
v1.25.0
v1.26.0
v1.27.0
v1.28.0
v1.29.0
v1.30.0
v1.31.0
v1.32.0
v1.33.0
v1.34.0
v1.35.0
v1.36.0
v1.37.0
v1.38.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46644.json"