| Name | CVE-2026-48747 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| symfony (PTS) | bullseye | 4.4.19+dfsg-2+deb11u6 | fixed |
| bullseye (security) | 4.4.19+dfsg-2+deb11u7 | fixed | |
| bookworm, bookworm (security) | 5.4.53+dfsg-0+deb12u1 | fixed | |
| trixie (security), trixie | 6.4.41+dfsg-0+deb13u1 | fixed | |
| forky | 7.4.14+dfsg-1 | fixed | |
| sid | 7.4.15+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| symfony | source | bullseye | (not affected) | |||
| symfony | source | bookworm | (not affected) | |||
| symfony | source | trixie | (not affected) | |||
| symfony | source | (unstable) | 7.4.13+dfsg-1 |
[trixie] - symfony <not-affected> (Vulnerable code not present)
[bookworm] - symfony <not-affected> (Vulnerable code not present)
[bullseye] - symfony <not-affected> (Vulnerable code not present)
https://symfony.com/blog/cve-2026-48747-mailomat-webhook-parser-reads-the-hmac-algorithm-from-the-request-signature-algorithm-downgrade
https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88 (v7.4.13)