CVE-2026-123792
waiting for further signalsZero needs more public information before it can validate it.GHSA-hwfg-qwvh-2wfx ↗EUVD-2026-118309 ↗
no check availablenot proven exploitable
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.
sensiolabs symfony <5.4.56; >=6.0.0; <6.4.50; >=7.0.0; <7.4.23; >=8.0.0; <8.1.11
fixed in 5.4.56, 6.4.50, 7.4.23, 8.1.11
CWE-407 Inefficient Algorithmic Complexity
ETK-2026-3733Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:composer/symfony/yaml
pkg:composer/symfony/symfony
1d 08h 36msince last run
13mAI analysisAnalysis: how long the AI spent reversing this signal.
description
Symfony applications using affected YAML parsing releases can consume excessive CPU or memory when processing hostile YAML, potentially exhausting PHP workers and disrupting service. An attacker must be able to submit data that the application parses as YAML; request payload handling may expose this when YAML content types are accepted.
mitigation
Upgrade symfony/yaml or symfony/symfony to 5.4.56, 6.4.50, 7.4.23, or 8.1.11, as appropriate for the maintained branch. Restrict endpoints to expected input formats and do not accept YAML from untrusted clients unless required.
fixed in 5.4.56, 6.4.50, 7.4.23, 8.1.11
check
no
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.
–
agent run time
13m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-11-06 15:19Z
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, not validated: no deterministic check could cover this one, and no technique passed our review.
source signals
Public signals that triggered or updated the pipeline. These are inputs for the deltas above.
- 2026-11-04 11:43Zghsa: trigger signal
- 2026-11-06 15:19Zcve_org: trigger signal, started the run
this entry in the feed
GET /api/v1/feed/CVE-2026-123792
{ "etk_id": "ETK-2026-3733", "cve_id": "CVE-2026-123792", "display_id": "CVE-2026-123792", "ghsa_id": "GHSA-hwfg-qwvh-2wfx", "euvd_id": "EUVD-2026-118309", "status": "published", "anchor_state": "anchored", "title": "Algorithmic denial of service in Symfony YAML parsing", "summary": "Symfony applications using affected YAML parsing releases can consume excessive CPU or memory when processing hostile YAML, potentially exhausting PHP workers and disrupting service. An attacker must be able to submit data that the application parses as YAML; request payload handling may expose this when YAML content types are accepted.", "mitigation": "Upgrade symfony/yaml or symfony/symfony to 5.4.56, 6.4.50, 7.4.23, or 8.1.11, as appropriate for the maintained branch. Restrict endpoints to expected input formats and do not accept YAML from untrusted clients unless required.", "vendor": "sensiolabs", "product": "symfony", "affected": [ { "affected_notes": [], "affected_ranges": [ "<5.4.56" ], "ecosystem": "composer", "fixed_versions": [ "5.4.56" ], "package_name": "symfony/yaml", "purl": "pkg:composer/symfony/yaml" }, { "affected_notes": [], "affected_ranges": [ ">=6.0.0", "<6.4.50" ], "ecosystem": "composer", "fixed_versions": [ "6.4.50" ], "package_name": "symfony/yaml", "purl": "pkg:composer/symfony/yaml" }, { "affected_notes": [], "affected_ranges": [ ">=7.0.0", "<7.4.23" ], "ecosystem": "composer", "fixed_versions": [ "7.4.23" ], "package_name": "symfony/yaml", "purl": "pkg:composer/symfony/yaml" }, { "affected_notes": [], "affected_ranges": [ ">=8.0.0", "<8.1.11" ], "ecosystem": "composer", "fixed_versions": [ "8.1.11" ], "package_name": "symfony/yaml", "purl": "pkg:composer/symfony/yaml" }, { "affected_notes": [], "affected_ranges": [ "<5.4.56" ], "ecosystem": "composer", "fixed_versions": [ "5.4.56" ], "package_name": "symfony/symfony", "purl": "pkg:composer/symfony/symfony" }, { "affected_notes": [], "affected_ranges": [ ">=6.0.0", "<6.4.50" ], "ecosystem": "composer", "fixed_versions": [ "6.4.50" ], "package_name": "symfony/symfony", "purl": "pkg:composer/symfony/symfony" }, { "affected_notes": [], "affected_ranges": [ ">=7.0.0", "<7.4.23" ], "ecosystem": "composer", "fixed_versions": [ "7.4.23" ], "package_name": "symfony/symfony", "purl": "pkg:composer/symfony/symfony" }, { "affected_notes": [], "affected_ranges": [ ">=8.0.0", "<8.1.11" ], "ecosystem": "composer", "fixed_versions": [ "8.1.11" ], "package_name": "symfony/symfony", "purl": "pkg:composer/symfony/symfony" } ], "cwes": [ 407 ], "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": null, "epss_percentile": null, "epss_asof": null, "automation": "contextual", "check": false, "check_confidence_basis": null, "exploit": false, "pipeline_minutes": 12.8568335, "t0_at": "2026-11-06T15:19:58.366000+00:00", "signals": { "trigger_signal": { "at": "2026-11-04T11:43:34+00:00", "days": -2.150282013888889, "is_lower_bound": false, "measured_at": "2026-11-06T15:19:58.366000+00:00", "url": "https://www.cve.org/CVERecord?id=CVE-2026-123792" } } }
published 2026-11-06 15:51Z
last change 2026-11-08 00:40Z
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