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CVE-2026-45305

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::cleanup() used regular expressions with overlapping quantifiers for YAML directive, comment, and document marker cleanup, allowing crafted input to make parsing hang for an arbitrarily long time. 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:v2:831a83a0d4d00a37ae12759a7ce62674c29bc1be17c459c316cd15a4afc71d23
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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"name":"https://github.com/symfony/symfony/commit/9749cd43c5e09b3735093623670b21b9d8a056cb","tags":["x_refsource_MISC"],"url":"https://github.com/symfony/symfony/commit/9749cd43c5e09b3735093623670b21b9d8a056cb"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /containers/cna/references/5
{"name":"https://github.com/symfony/symfony/security/advisories/GHSA-9frc-8383-795m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/symfony/symfony/security/advisories/GHSA-9frc-8383-795m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f6ad88ec8d4132e30d95c5ad10b2370c9fcd4aff2befe93a7f4fa944b44d9f9f · sha256:d9556f28db7f6d98… · /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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