Description
Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | symfony | 2.8.6+dfsg-1 | — |
| Debian 13 | symfony | 2.8.6+dfsg-1 | — |
| Debian 12 | symfony | 2.8.6+dfsg-1 | — |
| Debian 9 | symfony | 2.8.7+dfsg-1.3+deb9u1 | DSA-4262-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | symfony/security | >= 2.8.0, < 2.8.6 | 2.8.6 | GHSA-wvj5-r78r-hhfq |
| Packagist | symfony/security | >= 3.0.0, < 3.0.6 | 3.0.6 | GHSA-wvj5-r78r-hhfq |
| Packagist | symfony/security-core | >= 2.8.0, < 2.8.6 | 2.8.6 | GHSA-wvj5-r78r-hhfq |
| Packagist | symfony/security-core | >= 3.0.0, < 3.0.6 | 3.0.6 | GHSA-wvj5-r78r-hhfq |
| Packagist | symfony/symfony | >= 2.8.0, < 2.8.6 | 2.8.6 | GHSA-wvj5-r78r-hhfq |
| Packagist | symfony/symfony | >= 3.0.0, < 3.0.6 | 3.0.6 | GHSA-wvj5-r78r-hhfq |
Advisories 1
- DSA-4262-1 symfony - security update Debian Security (DSA / DLA) · Mar 9, 2026