Description
An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.
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 | 4.3.8+dfsg-1 | — |
| Debian 13 | symfony | 4.3.8+dfsg-1 | — |
| Debian 12 | symfony | 4.3.8+dfsg-1 | — |
| Debian 10 | symfony | 3.4.22+dfsg-2+deb10u1 | DSA-4573-1 |
| Debian 9 | symfony | 2.8.7+dfsg-1.3+deb9u3 | DSA-4573-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | symfony | 2.3.21+dfsg-4+deb8u6 | DLA-1999-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | symfony | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | symfony | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | symfony/http-kernel | >= 2.2.0, < 2.8.52 | 2.8.52 | GHSA-q8hg-pf8v-cxrv |
| Packagist | symfony/http-kernel | >= 3.0.0, < 3.4.35 | 3.4.35 | GHSA-q8hg-pf8v-cxrv |
| Packagist | symfony/http-kernel | >= 4.0.0, < 4.2.12 | 4.2.12 | GHSA-q8hg-pf8v-cxrv |
| Packagist | symfony/http-kernel | >= 4.3.0, < 4.3.8 | 4.3.8 | GHSA-q8hg-pf8v-cxrv |
| Packagist | symfony/symfony | >= 2.2.0, < 2.8.52 | 2.8.52 | GHSA-q8hg-pf8v-cxrv |
| Packagist | symfony/symfony | >= 3.0.0, < 3.4.35 | 3.4.35 | GHSA-q8hg-pf8v-cxrv |
| Packagist | symfony/symfony | >= 4.0.0, < 4.2.12 | 4.2.12 | GHSA-q8hg-pf8v-cxrv |
| Packagist | symfony/symfony | >= 4.3.0, < 4.3.8 | 4.3.8 | GHSA-q8hg-pf8v-cxrv |
Advisories 2
- DSA-4573-1 symfony - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1999-1 symfony - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://symfony.com/blog/symfony-4-3-8-released
- https://github.com/symfony/symfony/releases/tag/v4.3.8
- https://symfony.com/blog/cve-2019-18887-use-constant-time-comparison-in-urisigner
- FEDORA-2019-9c2ad3b018 vendor-advisory
- FEDORA-2019-5ae4fd9203 vendor-advisory
- FEDORA-2019-8b0ba02338 vendor-advisory