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CVE-2026-46644: symfony/polyfill-intl-idn: xn-- labels with ASCII-only Punycode payloads are treated as equivalent to their decoded form

low Affects symfony/polyfill, symfony/polyfill-intl-idn. Feed 2026.10.29.3, updated 2026-10-29; published ; advisory modified .

symfony/polyfill-intl-idn: xn-- labels with ASCII-only Punycode payloads are treated as equivalent to their decoded form

Package
symfony/polyfill Composer
Affected versions
>=1.17.1 and <1.38.1
Fixed in
1.38.1
Severity
low
Exploitation
not on CISA KEV · EPSS 1% (45.2th percentile)
Published
2026-05-28
Source
osv.dev

References

symfony/polyfill-intl-idn: xn-- labels with ASCII-only Punycode payloads are treated as equivalent to their decoded form

Package
symfony/polyfill-intl-idn Composer
Affected versions
>=1.17.1 and <1.38.1
Fixed in
1.38.1
Severity
low
Exploitation
not on CISA KEV · EPSS 1% (45.2th percentile)
Published
2026-05-28
Source
osv.dev

References

CWE-1289
NVD recordsymfony/polyfill advisoriessymfony/polyfill-intl-idn advisories

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