Description
An issue was discovered in Http Foundation in Symfony 2.7.0 through 2.7.48, 2.8.0 through 2.8.43, 3.3.0 through 3.3.17, 3.4.0 through 3.4.13, 4.0.0 through 4.0.13, and 4.1.0 through 4.1.2. It arises from support for a (legacy) IIS header that lets users override the path in the request URL via the X-Original-URL or X-Rewrite-URL HTTP request header. These headers are designed for IIS support, but it's not verified that the server is in fact running IIS, which means anybody who can send these requests to an application can trigger this. This affects \Symfony\Component\HttpFoundation\Request::prepareRequestUri() where X-Original-URL and X_REWRITE_URL are both used. The fix drops support for these methods so that they cannot be used as attack vectors such as web cache poisoning.
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 | 3.4.14+dfsg-1 | — |
| Debian 13 | symfony | 3.4.14+dfsg-1 | — |
| Debian 12 | symfony | 3.4.14+dfsg-1 | — |
| Debian 9 | symfony | 2.8.7+dfsg-1.3+deb9u2 | DSA-4441-1 |
| Debian 8 | symfony | 2.3.21+dfsg-4+deb8u4 | DLA-1707-1 |
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-foundation | >= 2.7.0, < 2.7.49 | 2.7.49 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/http-foundation | >= 2.8.0, < 2.8.44 | 2.8.44 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/http-foundation | >= 3.0.0, < 3.3.18 | 3.3.18 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/http-foundation | >= 3.4.0, < 3.4.14 | 3.4.14 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/http-foundation | >= 4.0.0, < 4.0.14 | 4.0.14 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/http-foundation | >= 4.1.0, < 4.1.3 | 4.1.3 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/symfony | >= 2.7.0, < 2.7.49 | 2.7.49 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/symfony | >= 2.8.0, < 2.8.44 | 2.8.44 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/symfony | >= 3.0.0, < 3.3.18 | 3.3.18 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/symfony | >= 3.4.0, < 3.4.14 | 3.4.14 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/symfony | >= 4.0.0, < 4.0.14 | 4.0.14 | GHSA-8wgj-6wx8-h5hq |
| Packagist | symfony/symfony | >= 4.1.0, < 4.1.3 | 4.1.3 | GHSA-8wgj-6wx8-h5hq |
Advisories 2
- DSA-4441-1 symfony - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1707-1 symfony - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- 104943 vdb-entry
- https://www.drupal.org/SA-CORE-2018-005
- [debian-lts-announce] 20190310 [SECURITY] [DLA 1707-1] symfony security update mailing-list
- https://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headers
- https://github.com/symfony/symfony/commit/e447e8b92148ddb3d1956b96638600ec95e08f6b
- 1041405 vdb-entry
- DSA-4441 vendor-advisory
- 20190510 [SECURITY] [DSA 4441-1] symfony security update mailing-list