symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload decodes to ASCII-only: insecure equivalence
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| symfony | polyfill | affected |
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| symfony | polyfill-intl-idn | affected |
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No data.
No data.
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| Symfony | Polyfill |
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| Symfony | Polyfill-intl-idn |
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| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-2xf4-cg6j-vhgq | symfony/polyfill-intl-idn: xn-- labels with ASCII-only Punycode payloads are treated as equivalent to their decoded form |
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.538% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Symfony
Symfony polyfill Symfony polyfill-intl-idn |
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| Vendors & Products |
Symfony
Symfony polyfill Symfony polyfill-intl-idn |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload decodes to ASCII-only: insecure equivalence | |
| Weaknesses | CWE-1289 | |
| References |
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| Metrics |
cvssV4_0
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