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CVE-2026-45304

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Yaml\Parser resolved YAML collection aliases recursively, allowing a small untrusted YAML input to expand into a multi-gigabyte structure and exhaust memory. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:10d27164c6a85014c755ec3b8c40d632d36b9eb387488a6ee512594bdf9b09ed
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":"yaml","vendor":"symfony","versions":[{"status":"affected","version":"< 5.4.52"},{"status":"affected","version":">= 6.0.0-BETA1, < 6.4.40"},{"status":"affected","version":">= 7.0.0-BETA1, < 7.4.12"},{"status":"affected","version":">= 8.0.0-BETA1, < 8.0.12"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/affected/1

{"product":"symfony","vendor":"symfony","versions":[{"status":"affected","version":"< 5.4.52"},{"status":"affected","version":">= 6.0.0-BETA1, < 6.4.40"},{"status":"affected","version":">= 7.0.0-BETA1, < 7.4.12"},{"status":"affected","version":">= 8.0.0-BETA1, < 8.0.12"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"yaml","vendor":"symfony","versions":[{"status":"affected","version":"< 5.4.52"},{"status":"affected","version":">= 6.0.0-BETA1, < 6.4.40"},{"status":"affected","version":">= 7.0.0-BETA1, < 7.4.12"},{"status":"affected","version":">= 8.0.0-BETA1, < 8.0.12"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/affected/1
{"product":"symfony","vendor":"symfony","versions":[{"status":"affected","version":"< 5.4.52"},{"status":"affected","version":">= 6.0.0-BETA1, < 6.4.40"},{"status":"affected","version":">= 7.0.0-BETA1, < 7.4.12"},{"status":"affected","version":">= 8.0.0-BETA1, < 8.0.12"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-776","description":"CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/references/1
{"name":"https://github.com/symfony/symfony/releases/tag/v5.4.52","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/symfony/releases/tag/v5.4.52"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/references/2
{"name":"https://github.com/symfony/symfony/releases/tag/v6.4.40","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/symfony/releases/tag/v6.4.40"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/references/3
{"name":"https://github.com/symfony/symfony/releases/tag/v7.4.12","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/symfony/releases/tag/v7.4.12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/references/4
{"name":"https://github.com/symfony/symfony/releases/tag/v8.0.12","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/symfony/releases/tag/v8.0.12"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /containers/cna/references/5
{"name":"https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4","tags":["x_refsource_CONFIRM"],"url":"https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f3e6ed59e1b2a73786c1aaa1198f30a05821ae26fe2127b69cbc4e897e7eef2 · sha256:a85fe8689ef91a52… · /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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