CVE-2026-118515
waiting for further signalsZero needs more public information before it can validate it.no check availablenot proven exploitable
awaiting cvepublic 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/serializer <5.4.56; >=6; <6.4.50; >=7; <7.4.23; >=8; <8.1.11
fixed in 5.4.56, 6.4.50, 7.4.23, 8.1.11
CWE-73 External Control of File Name or Path
ETK-2026-3496Zero's internal tracking ID, independent of the CVE number., permanent identifier
pkg:composer/symfony/serializer
pkg:composer/symfony/symfony
cvss7.0ethiack provisional
2h 25msince last run
12mAI analysisAnalysis: how long the AI spent reversing this signal.
description
Symfony Serializer is affected when untrusted request or other input is deserialized into an object containing an UploadedFile or related file-subclass property. An attacker may cause the application to treat a PHP-readable server file as an uploaded file, potentially exposing or moving it depending on application behavior.
mitigation
Upgrade symfony/serializer and symfony/symfony to 5.4.56, 6.4.50, 7.4.23, or 8.1.11, as appropriate. Ensure custom serializer configurations include DataUriNormalizer before ObjectNormalizer.
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.
–
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
12m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
not published yet
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, started the run
this entry in the feed
GET /api/v1/feed/CVE-2026-118515
{ "etk_id": "ETK-2026-3496", "cve_id": "CVE-2026-118515", "display_id": "CVE-2026-118515", "ghsa_id": "GHSA-h38r-xrmh-cwhr", "euvd_id": null, "status": "published", "anchor_state": "awaiting_cve", "title": "Unsafe file-object deserialization in Symfony Serializer", "summary": "Symfony Serializer is affected when untrusted request or other input is deserialized into an object containing an UploadedFile or related file-subclass property. An attacker may cause the application to treat a PHP-readable server file as an uploaded file, potentially exposing or moving it depending on application behavior.", "mitigation": "Upgrade symfony/serializer and symfony/symfony to 5.4.56, 6.4.50, 7.4.23, or 8.1.11, as appropriate. Ensure custom serializer configurations include DataUriNormalizer before ObjectNormalizer.", "vendor": "composer", "product": "composer:symfony/serializer", "affected": [ { "affected_notes": [], "affected_ranges": [ "<5.4.56" ], "ecosystem": "composer", "fixed_versions": [ "5.4.56" ], "package_name": "symfony/serializer", "purl": "pkg:composer/symfony/serializer" }, { "affected_notes": [], "affected_ranges": [ ">=6", "<6.4.50" ], "ecosystem": "composer", "fixed_versions": [ "6.4.50" ], "package_name": "symfony/serializer", "purl": "pkg:composer/symfony/serializer" }, { "affected_notes": [], "affected_ranges": [ ">=7", "<7.4.23" ], "ecosystem": "composer", "fixed_versions": [ "7.4.23" ], "package_name": "symfony/serializer", "purl": "pkg:composer/symfony/serializer" }, { "affected_notes": [], "affected_ranges": [ ">=8", "<8.1.11" ], "ecosystem": "composer", "fixed_versions": [ "8.1.11" ], "package_name": "symfony/serializer", "purl": "pkg:composer/symfony/serializer" }, { "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", "<6.4.50" ], "ecosystem": "composer", "fixed_versions": [ "6.4.50" ], "package_name": "symfony/symfony", "purl": "pkg:composer/symfony/symfony" }, { "affected_notes": [], "affected_ranges": [ ">=7", "<7.4.23" ], "ecosystem": "composer", "fixed_versions": [ "7.4.23" ], "package_name": "symfony/symfony", "purl": "pkg:composer/symfony/symfony" }, { "affected_notes": [], "affected_ranges": [ ">=8", "<8.1.11" ], "ecosystem": "composer", "fixed_versions": [ "8.1.11" ], "package_name": "symfony/symfony", "purl": "pkg:composer/symfony/symfony" } ], "cwes": [ 73 ], "cvss_score": 7, "cvss_src": "ethiack_provisional", "cvss_vector": null, "epss_score": null, "epss_percentile": null, "epss_asof": null, "automation": "contextual", "check": false, "check_confidence_basis": null, "exploit": false, "pipeline_minutes": 11.796427433333333, "t0_at": null, "signals": { "trigger_signal": { "at": "2026-11-04T11:43:42+00:00", "days": -0.13808216944444446, "is_lower_bound": true, "measured_at": "2026-11-04T15:02:32.335734+00:00", "url": "https://github.com/symfony/symfony/security/advisories/GHSA-h38r-xrmh-cwhr" } } }
published 2026-11-04 12:25Z
last change 2026-11-04 14:42Z
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