CERT-FR flags multiple Symfony component flaws
CERT-FR advises patching multiple Symfony components for flaws enabling denial of service, data exposure, and security bypass.
Sourcecert.cyber.gouv.fr — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CERT-FR has published an advisory covering multiple vulnerabilities affecting several core Symfony framework components, including filesystem, http-client, http-foundation, json-path, routing, security-http, serializer, symfony (core), and yaml packages. The affected version ranges span the 5.4.x, 6.x, 7.x, and 8.x branches, with fixes available in 5.4.56, 6.4.50, 7.4.23, and 8.1.11 respectively depending on the component.
The vulnerabilities collectively allow an attacker to cause a remote denial of service, compromise the confidentiality of data, or bypass security policy enforcement within affected Symfony-based applications. The advisory references nine separate GitHub Security Advisories (GHSA) published by the Symfony project on 4 November 2026, with one formal CVE identifier (CVE-2026-118516) cited. No evidence of active exploitation is mentioned in the bulletin.
Defenders running Symfony-based PHP applications should identify which of the listed components are in use, check installed versions against the vulnerable ranges, and apply the vendor-provided patches referenced in the GHSA advisories as soon as practical given the framework's widespread use in web application backends.
Mentioned in this report
Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1460
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