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CVE-2026-46644

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 UR
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0ed241ab8e69c5d986d61f3791abc3b56f687ab767ca3ff6a43512cf8783c3a7
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"polyfill","vendor":"symfony","versions":[{"status":"affected","version":">= 1.17.1, < 1.38.1"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/affected/0

{"product":"polyfill-intl-idn","vendor":"symfony","versions":[{"status":"affected","version":">= 1.17.1, < 1.38.1"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"product":"polyfill","vendor":"symfony","versions":[{"status":"affected","version":">= 1.17.1, < 1.38.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/affected/0
{"product":"polyfill-intl-idn","vendor":"symfony","versions":[{"status":"affected","version":">= 1.17.1, < 1.38.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-1289","description":"CWE-1289: Improper Validation of Unsafe Equivalence in Input","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/symfony/polyfill/commit/1be936e2491ccebe152bd736dfc91eb1422c8bec","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/polyfill/commit/1be936e2491ccebe152bd736dfc91eb1422c8bec"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/references/1
{"name":"https://github.com/symfony/polyfill/releases/tag/v1.38.1","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/polyfill/releases/tag/v1.38.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/references/2
{"name":"https://github.com/symfony/polyfill/security/advisories/GHSA-2xf4-cg6j-vhgq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/symfony/polyfill/security/advisories/GHSA-2xf4-cg6j-vhgq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:296754789782e63831d23fb2a4c970c22ee9e23b4ef825603ab8cf16ad2935d4 · sha256:25314b885a21378c… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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