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CVE-2026-108082

CVE-2026-108082

validatedZero produced an exploit or a check.

GHSA-r925-mgvr-h9cc ↗EUVD-2026-102102 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
composer:symfony/http-foundation >=5.4.1; <5.4.54; >=6.0.1; <6.4.46; >=7; <7.4.19; >=8; <8.1.7
fixed in 5.4.54, 6.4.46, 7.4.19, 8.1.7
CWE-1333 Inefficient Regular Expression Complexity
ETK-2026-1667Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:composer/symfony/http-foundation
pkg:composer/symfony/symfony
cvss8.7cna vendorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
+31mTTV
15mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
trigger signal +0hcve.org publication+7h47mcheck available+8h18magent stopped
0
+2h
+4h
+6h

description

Symfony HttpFoundation releases before 5.4.54, 6.4.46, 7.4.19, and 8.1.7 may consume excessive CPU while parsing certain Cache-Control headers. An unauthenticated remote party can impair request handling if the application accepts HTTP requests with attacker-controlled headers.

mitigation

Upgrade symfony/http-foundation, or the symfony metapackage, to 5.4.54, 6.4.48, 7.4.21, or 8.1.9 or later on the applicable branch. Prefer the later 6.4, 7.4, and 8.1 releases because they also correct a follow-on header-splitting regression.

fixed in 5.4.54, 6.4.46, 7.4.19, 8.1.7

check
available
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
0.37%29th percentile
agent run time
15m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-10-15 14:46Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual check: a technique exists and was validated, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-15 06:58Z
  2. 2026-10-15 14:46Z

this entry in the feed

GET /api/v1/feed/CVE-2026-108082

{
  "etk_id": "ETK-2026-1667",
  "cve_id": "CVE-2026-108082",
  "display_id": "CVE-2026-108082",
  "ghsa_id": "GHSA-r925-mgvr-h9cc",
  "euvd_id": "EUVD-2026-102102",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Regular-expression denial of service in symfony/http-foundation",
  "summary": "Symfony HttpFoundation releases before 5.4.54, 6.4.46, 7.4.19, and 8.1.7 may consume excessive CPU while parsing certain Cache-Control headers. An unauthenticated remote party can impair request handling if the application accepts HTTP requests with attacker-controlled headers.",
  "mitigation": "Upgrade symfony/http-foundation, or the symfony metapackage, to 5.4.54, 6.4.48, 7.4.21, or 8.1.9 or later on the applicable branch. Prefer the later 6.4, 7.4, and 8.1 releases because they also correct a follow-on header-splitting regression.",
  "vendor": "composer",
  "product": "composer:symfony/http-foundation",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=5.4.1",
        "<5.4.54"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "5.4.54"
      ],
      "package_name": "symfony/http-foundation",
      "purl": "pkg:composer/symfony/http-foundation"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=6.0.1",
        "<6.4.46"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "6.4.46"
      ],
      "package_name": "symfony/http-foundation",
      "purl": "pkg:composer/symfony/http-foundation"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=7",
        "<7.4.19"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "7.4.19"
      ],
      "package_name": "symfony/http-foundation",
      "purl": "pkg:composer/symfony/http-foundation"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=8",
        "<8.1.7"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "8.1.7"
      ],
      "package_name": "symfony/http-foundation",
      "purl": "pkg:composer/symfony/http-foundation"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=5.4.1",
        "<5.4.54"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "5.4.54"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=6.0.1",
        "<6.4.46"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "6.4.46"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=7",
        "<7.4.19"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "7.4.19"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=8",
        "<8.1.7"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "8.1.7"
      ],
      "package_name": "symfony/symfony",
      "purl": "pkg:composer/symfony/symfony"
    }
  ],
  "cwes": [
    1333
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "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",
  "epss_score": 0.0037,
  "epss_percentile": 0.2909,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 14.512930166666667,
  "t0_at": "2026-10-15T14:46:01.594000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-15T15:16:50.192131+00:00",
      "days": 0.02139581170138889,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T14:46:01.594000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-15T06:58:40+00:00",
      "days": -0.3245554861111111,
      "is_lower_bound": false,
      "measured_at": "2026-10-15T14:46:01.594000+00:00",
      "url": "https://github.com/symfony/symfony/security/advisories/GHSA-r925-mgvr-h9cc"
    }
  }
}

published 2026-10-15 10:05Z
last change 2026-10-21 05:31Z

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