CVE-2020-15094

In Symfony before versions 4.4.13 and 5.1.5, the CachingHttpClient class from the HttpClient Symfony component relies on the HttpCache class to handle requests. HttpCache uses internal headers like X-Body-Eval and X-Body-File to control the restoration of cached responses. The class was initially written with surrogate caching and ESI support in mind (all HTTP calls come from a trusted backend in that scenario). But when used by CachingHttpClient and if an attacker can control the response for a request being made by the CachingHttpClient, remote code execution is possible. This has been fixed in versions 4.4.13 and 5.1.5.

• CWE-212

• https://github.com/symfony/symfony/commit/d9910e0b33a2e0f993abff41c6fbc86951b66d78Patch, Third Party Advisory
• https://github.com/symfony/symfony/security/advisories/GHSA-754h-5r27-7x3rThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HNGUWOEETOFVH4PN3I3YO4QZHQ4AUKF3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VAQJXAKWPMWB7OL6QPG2ZSEQZYYPU5RC/
• https://packagist.org/packages/symfony/http-kernelProduct, Third Party Advisory
• https://packagist.org/packages/symfony/symfonyProduct, Third Party Advisory
• https://github.com/symfony/symfony/commit/d9910e0b33a2e0f993abff41c6fbc86951b66d78Patch, Third Party Advisory
• https://github.com/symfony/symfony/security/advisories/GHSA-754h-5r27-7x3rThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HNGUWOEETOFVH4PN3I3YO4QZHQ4AUKF3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VAQJXAKWPMWB7OL6QPG2ZSEQZYYPU5RC/
• https://packagist.org/packages/symfony/http-kernelProduct, Third Party Advisory
• https://packagist.org/packages/symfony/symfonyProduct, Third Party Advisory

Published

Sep 2, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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