CVE-2026-45133

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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, 6.4.40, 7.4.12, and 8.0.12.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

May 27, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Jul 14, 2026
Patch available. Sources: github_release, github.
github Patch Available

YAML Parser Stack Exhaustion via Unbounded Recursion in Nested Blocks, Sequences, and Mappings · Advisory · symfony/symfony · GitHub

https://github.com/symfony/symfony/security/advisories/GHSA-c2p3-7m5p-cv8x
github_release Patch Available

v8.0.12

Patch available: symfony/symfony v8.0.12

https://github.com/symfony/symfony/releases/tag/v8.0.12
github_release Patch Available

v7.4.12

Patch available: symfony/symfony v7.4.12

https://github.com/symfony/symfony/releases/tag/v7.4.12
github_release Patch Available

v6.4.40

Patch available: symfony/symfony v6.4.40

https://github.com/symfony/symfony/releases/tag/v6.4.40
github_release Patch Available

v5.4.52

Patch available: symfony/symfony v5.4.52

https://github.com/symfony/symfony/releases/tag/v5.4.52

Vendor Advisories for CVE-2026-45133(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(6 across 5 ecosystems)
Packagist(2)
PackageVulnerable rangeFixed inDependents
symfony/symfonyv8.0.0 ... v8.0.9 (12 versions)8.0.12—
symfony/yamlv8.0.0 ... v8.0.8 (6 versions)8.0.12—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
symfony4.4.19+dfsg-2 ... 8.1.3+dfsg-1 (200 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
symfony5.4.23+dfsg-1 ... 5.4.52+dfsg-0+deb12u1 (22 versions)5.4.53+dfsg-0+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
symfony6.4.21+dfsg-2, 6.4.21+dfsg-2+deb13u1, 6.4.24+dfsg-1, 6.4.25+dfsg-1, 6.4.40+dfsg-0+deb13u16.4.41+dfsg-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
symfony6.4.21+dfsg-2 ... 7.4.9+dfsg-1 (52 versions)7.4.12+dfsg-1—

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 07:32 UTCEG score recompute
  3. 2026-09-13 16:47 UTCEPSS rescore
  4. 2026-09-13 03:09 UTCOSV refresh
  5. 2026-09-12 15:01 UTCEPSS rescore
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 09:37 UTCEPSS rescore
  8. 2026-09-10 09:34 UTCEPSS rescore
  9. 2026-09-08 22:00 UTCEPSS rescore
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-02 14:12 UTCEPSS rescore
  14. 2026-09-01 13:54 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-25 05:09 UTCEG score recompute
  22. 2026-08-23 14:52 UTCEG score recompute
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 20:28 UTCEG score recompute
Show 62 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 11:12 UTCEG score recompute
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-16 15:12 UTCEG score recompute
  7. 2026-08-16 14:56 UTCEPSS rescore
  8. 2026-08-16 02:43 UTCEG score recompute
  9. 2026-08-16 02:14 UTCEPSS rescore
  10. 2026-08-15 01:30 UTCEPSS rescore
  11. 2026-08-14 01:23 UTCEG score recompute
  12. 2026-08-13 22:00 UTCEPSS rescore
  13. 2026-08-12 22:19 UTCEG score recompute
  14. 2026-08-12 13:51 UTCEPSS rescore
  15. 2026-08-12 00:27 UTCEG score recompute
  16. 2026-08-11 00:09 UTCEG score recompute
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-09 17:04 UTCEG score recompute
  19. 2026-08-09 13:46 UTCEPSS rescore
  20. 2026-08-08 19:16 UTCEG score recompute
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-07 16:46 UTCEG score recompute
  23. 2026-08-06 18:38 UTCEG score recompute
  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-05 20:50 UTCEG score recompute
  26. 2026-08-05 19:17 UTCEPSS rescore
  27. 2026-08-04 15:10 UTCEPSS rescore
  28. 2026-08-04 10:38 UTCEPSS rescore
  29. 2026-08-03 16:24 UTCEG score recompute
  30. 2026-08-03 10:36 UTCEPSS rescore
  31. 2026-08-02 12:53 UTCEG score recompute
  32. 2026-08-02 02:27 UTCEPSS rescore
  33. 2026-08-01 15:03 UTCEG score recompute
  34. 2026-08-01 04:16 UTCEPSS rescore
  35. 2026-07-31 07:04 UTCEG score recompute
  36. 2026-07-30 16:28 UTCEPSS rescore
  37. 2026-07-30 01:30 UTCEPSS rescore
  38. 2026-07-29 14:41 UTCEG score recompute
  39. 2026-07-28 15:36 UTCEPSS rescore
  40. 2026-07-27 14:13 UTCEPSS rescore
  41. 2026-07-27 09:57 UTCEG score recompute
  42. 2026-07-26 14:54 UTCEPSS rescore
  43. 2026-07-26 14:54 UTCEPSS rescore
  44. 2026-07-25 14:18 UTCEPSS rescore
  45. 2026-07-24 14:17 UTCEPSS rescore
  46. 2026-07-23 14:18 UTCEPSS rescore
  47. 2026-07-23 03:16 UTCEG score recompute▼ 0.70
  48. 2026-07-22 14:08 UTCEPSS rescore
  49. 2026-07-21 15:24 UTCEPSS rescore
  50. 2026-07-20 17:08 UTCEPSS rescore
  51. 2026-07-19 14:31 UTCEPSS rescore
  52. 2026-07-19 02:29 UTCEPSS rescore
  53. 2026-07-18 10:04 UTCEPSS rescore
  54. 2026-07-16 17:03 UTCEPSS rescore
  55. 2026-07-15 16:57 UTCEPSS rescore
  56. 2026-07-15 16:23 UTCNVD updateCVSS v3 → 7.5
  57. 2026-07-14 19:04 UTCEG score recompute▲ 8.20
  58. 2026-07-14 19:00 UTCMITRE cvelistV5CVSS v3 → 8.2 · CVSS v4 → 8.2 · severity → HIGH
  59. 2026-06-14 23:18 UTCEPSS rescore
  60. 2026-06-13 23:00 UTCEPSS rescore
  61. 2026-06-12 23:12 UTCEPSS rescore
  62. 2026-05-27 21:35 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-45133?
CVE-2026-45133 is a high vulnerability published on May 27, 2026. 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…
When was CVE-2026-45133 disclosed?
CVE-2026-45133 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45133 actively exploited?
CVE-2026-45133 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.7% of all scored CVEs.
What is the CVSS score of CVE-2026-45133?
CVE-2026-45133 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-45133?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45133, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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