Debian Fixes Symfony Access Control, Disclosure and XML Flaws
Tech GuruQuick Answer
Update Debian 13 Symfony packages to 6.4.50+dfsg-0+deb13u1. Restart affected application workers as needed, test access controls and XML-handling workflows, and retain package and deployment evidence.
Confirm Scope And Apply The Supported Remediation
What to do now: Record Debian release, installed Symfony packages, PHP application owners, worker processes and independently bundled Composer dependencies. Match distribution-managed Symfony on trixie. A Debian package update does not establish that a separately vendored Composer copy has been remediated. Install 6.4.50+dfsg-0+deb13u1 from the supported Debian security repositories and deploy updated application images where the package is bundled. Confirm complete package versions and loaded application dependencies, restart affected workers, test authorization and normal XML processing, and retain change and validation results.
Last verified: 2026-11-10 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | Symfony PHP framework packages on Debian 13 trixie |
|---|---|
| Advisory | DSA-6617-1 |
| CVEs | CVE-2026-118513, CVE-2026-118514, CVE-2026-118515, CVE-2026-118516, CVE-2026-118517, CVE-2026-121373, CVE-2026-121623, CVE-2026-121949, CVE-2026-121971, CVE-2026-122053, CVE-2026-123119, CVE-2026-123125, CVE-2026-123339, CVE-2026-123746, CVE-2026-123792, CVE-2026-123824 |
| Authoritative release date | November 9, 2026 at 21:45:02 UTC, from the official Debian security-announce message. |
| Authority revision date | No later revision stated. |
| Affected versions | Debian 13 trixie installations using the Symfony packages requiring DSA-6617-1. The advisory does not give a universal upstream lower affected-version boundary or extend this fix to other Debian releases. |
| Fixed version | 6.4.50+dfsg-0+deb13u1 |
| CVSS base score | Not provided by the authority |
| CVSS severity | Not provided by the authority |
| Exploitation status | Debian does not state exploitation in this advisory.; no exploitation claim is inferred. |
What Changed
Debian issued DSA-6617-1 for sixteen Symfony vulnerabilities involving access-control bypass, information disclosure, XML external entities and denial of service. The trixie package update supplies the supported distribution fix.
What To Validate Now
- Inventory. Record Debian release, installed Symfony packages, PHP application owners, worker processes and independently bundled Composer dependencies.
- Establish applicability. Match distribution-managed Symfony on trixie. A Debian package update does not establish that a separately vendored Composer copy has been remediated.
- Remediate. Install 6.4.50+dfsg-0+deb13u1 from the supported Debian security repositories and deploy updated application images where the package is bundled.
- Validate. Confirm complete package versions and loaded application dependencies, restart affected workers, test authorization and normal XML processing, and retain change and validation results.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Stage application regression checks before broad rollout. Do not run untrusted exploit payloads against production or infer a CVSS score from the vulnerability classes.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
