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| purl | pkg:composer/symfony/http-kernel@5.3.6 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
|
VCID-q9nm-2b34-yked
Aliases: CVE-2021-41267 GHSA-q3j3-w37x-hq2q |
Webcache Poisoning in symfony/http-kernel Description ----------- When a Symfony application is running behind a proxy or a load-balancer, you can tell Symfony to look for the `X-Forwarded-*` HTTP headers. HTTP headers that are not part of the "trusted_headers" allowed list are ignored and protect you from "Cache poisoning" attacks. In Symfony 5.2, we've added support for the `X-Forwarded-Prefix` header, but this header was accessible in sub-requests, even if it was not part of the "trusted_headers" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` HTTP header, leading to a web cache poisoning issue. Resolution ---------- Symfony now ensures that the `X-Forwarded-Prefix` HTTP header is not forwarded to sub-requests when it is not trusted. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487) for branch 5.3. Credits ------- We would like to thank Soner Sayakci for reporting the issue and Jérémy Derussé for fixing the issue. |
Affected by 0 other vulnerabilities. Affected by 0 other vulnerabilities. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| This package is not known to fix vulnerabilities. | ||
| Date | Actor | Action | Vulnerability | Source | VulnerableCode Version |
|---|---|---|---|---|---|
| 2025-07-03T18:07:21.727044+00:00 | GitLab Importer | Affected by | VCID-q9nm-2b34-yked | https://gitlab.com/gitlab-org/advisories-community/-/blob/main/packagist/symfony/http-kernel/CVE-2021-41267.yml | 37.0.0 |