CVE-2026-55878

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 91% 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, secondary
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Symfony UX is a JavaScript ecosystem for Symfony. From 2.32.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux:install console command installs files from a recipe kit by copying paths listed in a copy-files map, and because Path::isRelative() accepts paths like ../../../etc, a crafted or compromised kit can write attacker-controlled content to arbitrary locations or read local files outside the recipe directory. This issue is fixed in versions 2.36.1 and 3.2.0.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

Published

June 19, 2026

Last Modified

July 10, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)

Path Traversal in symfony/ux-toolkit Allows Arbitrary File Write and Read via Crafted Recipe Manifest · Advisory · symfony/ux · GitHub

https://github.com/symfony/ux/security/advisories/GHSA-p9xj-fpr2-jf2q
github_release Patch Available

v3.2.0

Patch available: symfony/ux v3.2.0

https://github.com/symfony/ux/releases/tag/v3.2.0
github_release Patch Available

v2.36.1

Patch available: symfony/ux v2.36.1

https://github.com/symfony/ux/releases/tag/v2.36.1
github_commit Patch Available

commit 7b4ddf3764bf (symfony/ux)

Patch available: symfony/ux v2.36.1 (contains commit 7b4ddf3764bf)

https://github.com/symfony/ux/commit/7b4ddf3764bf269a1b5fde5bf03c4bce568694e4

Vendor Advisories for CVE-2026-55878(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
symfony/ux-toolkitv3.0.0, v3.1.0
  • 2.32.0 up to 2.36.1: fixed in 2.36.1
  • 3.0.0 up to 3.2.0: fixed in 3.2.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 27× 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.

Showing the most recent 100 of 117 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
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  8. 2026-10-03 04:39 UTCOSV refresh
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  24. 2026-09-14 02:12 UTCEG score recompute
  25. 2026-09-13 16:47 UTCEPSS rescore
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  1. 2026-09-13 13:00 UTCEG score recompute
  2. 2026-09-11 14:53 UTCEPSS rescore
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  17. 2026-08-25 02:37 UTCEG score recompute
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  26. 2026-08-19 17:04 UTCEPSS rescore
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  28. 2026-08-18 13:48 UTCEPSS rescore
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  30. 2026-08-16 20:21 UTCEG score recompute
  31. 2026-08-16 14:56 UTCEPSS rescore
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  39. 2026-08-12 13:51 UTCEPSS rescore
  40. 2026-08-12 01:07 UTCEG score recompute
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  43. 2026-08-09 22:39 UTCEG score recompute
  44. 2026-08-09 13:46 UTCEPSS rescore
  45. 2026-08-07 20:12 UTCEG score recompute
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  48. 2026-08-06 06:21 UTCEG score recompute
  49. 2026-08-05 19:17 UTCEPSS rescore
  50. 2026-08-04 15:18 UTCEG score recompute
  51. 2026-08-04 15:10 UTCEPSS rescore
  52. 2026-08-04 10:39 UTCEPSS rescore
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  59. 2026-07-30 22:16 UTCEG score recompute
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  61. 2026-07-30 02:53 UTCEG score recompute
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  64. 2026-07-28 15:37 UTCEPSS rescore
  65. 2026-07-27 21:17 UTCEG score recompute
  66. 2026-07-26 16:46 UTCEG score recompute
  67. 2026-07-26 14:54 UTCEPSS rescore
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  71. 2026-07-23 03:20 UTCEG score recompute
  72. 2026-07-22 14:08 UTCEPSS rescore
  73. 2026-07-21 15:25 UTCEPSS rescore
  74. 2026-07-20 17:08 UTCEPSS rescore
  75. 2026-07-19 14:31 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-55878?
CVE-2026-55878 is a high vulnerability published on June 19, 2026. Symfony UX is a JavaScript ecosystem for Symfony. From 2.32.0 before 2.36.1 and from 3.0.0 before 3.2.0, the ux:install console command installs files from a recipe kit by copying paths listed in a copy-files map, and because Path::isRelative() accepts paths like ../../../etc, a crafted or…
When was CVE-2026-55878 disclosed?
CVE-2026-55878 was first published on June 19, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55878 actively exploited?
CVE-2026-55878 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55878?
CVE-2026-55878 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55878?
A fix for CVE-2026-55878 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55878 are linked in the Vendor Advisories panel on this page.

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