Improper Verification of Cryptographic Signature Affecting symfony package, versions <7.4.13+dfsg-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.2% (10th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-SYMFONY-17090574
  • published29 May 2026
  • disclosed14 Jul 2026

Introduced: 29 May 2026

CVE-2026-48747  (opens in a new tab)
CWE-347  (opens in a new tab)
CWE-757  (opens in a new tab)

How to fix?

Upgrade Debian:unstable symfony to version 7.4.13+dfsg-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream symfony package and not the symfony package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.

CVSS Base Scores

version 3.1