Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Symfony Mailer (symfony/mailer, and symfony/symfony) is vulnerable in versions below 5.4.52, from 6.0.0 to below 6.4.40, from 7.0.0 to below 7.4.12, and from 8.0.0 to below 8.0.12. The SendmailTransport does not place a "--" separator before recipient addresses, so a recipient beginning with a dash can be read by sendmail as a command-line option; the source does not describe the exact impact. Upgrade to 5.4.52, 6.4.40, 7.4.12, or 8.0.12 or later, which add the separator.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.7 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0052, the 45th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 20 May 2026, 10:21 UTC Published by the maintainers as a GitHub repository advisory
- 31 Oct 2026, 13:58 UTC First seen by agentprime
- 31 Oct 2026, 13:58 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-xx3c-qf5g-hc39
- OSV: GHSA-xx3c-qf5g-hc39
- github.com/symfony/symfony/security/advisories/GHSA-xx3c-qf5g-hc39
- github.com/symfony/symfony/commit/c45144862dc289d03952f41f6078174089a3afc6
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mailer/CVE-2026-45068.yaml
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45068.yaml
- github.com/symfony/symfony
- symfony.com/cve-2026-45068