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CVE-2026-45133

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, when the parser is exposed to attacker-controlled input, deeply nested mappings or sequences cause both the block-level (Parser::parseBlock()) and inline (Inline::parseSequence() / Inline::parseMapping()) parsers to recurse without a depth limit. A crafted document exhausts the PHP stack and crashes the worker. This issue is fixed in versions 5.4.52, 6.4.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c54ee48bff549c44448fecae85b1c15b4fe5dbf198e046a8348dee29c95bd7ff
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-674","description":"CWE-674: Uncontrolled Recursion","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/problemTypes/0/descriptions/0

{"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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

3 source assertions
{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-674","description":"CWE-674: Uncontrolled Recursion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/problemTypes/0/descriptions/0
{"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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/problemTypes/1/descriptions/0

Source references

5 source assertions
{"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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/references/1
{"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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/references/2
{"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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/references/3
{"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:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /containers/cna/references/4
{"name":"https://github.com/symfony/symfony/security/advisories/GHSA-c2p3-7m5p-cv8x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/symfony/symfony/security/advisories/GHSA-c2p3-7m5p-cv8x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a3ad81085379436ea3734f676426777441af81341c25ce1e4bef9421bb1c6dc2 · sha256:0bcc5679ed6c0ddc… · /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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