# Symfony has an Argument Injection in SendmailTransport via Dash-Prefixed Recipient Address Advisory record · `GHSA-xx3c-qf5g-hc39` - **Identifiers:** `GHSA-xx3c-qf5g-hc39` · `CVE-2026-45068` · `PKSA-28rh-rzzn-djk4` · `PKSA-9sj3-tcvg-s7g4` - **State:** Confirmed - **Severity:** CVSS 8.7 High - **Critical:** No - **Weakness (CWE):** [CWE-88](https://cwe.mitre.org/data/definitions/88.html) - **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md) - **Published:** 27 May 2026 - **Updated:** 10 Sept 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 27 May 2026, 20:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `symfony/mailer` (Packagist): affected `<5.4.52 || >=6.0.0, <6.4.40 || >=7.0.0, <7.4.12 || >=8.0.0, <8.0.12`; fixed in `5.4.52`, `6.4.40`, `7.4.12`, `8.0.12` - `symfony/symfony` (Packagist): affected `<5.4.52 || >=6.0.0, <6.4.40 || >=7.0.0, <7.4.12 || >=8.0.0, <8.0.12`; fixed in `5.4.52`, `6.4.40`, `7.4.12`, `8.0.12` ## 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. Written 31 Oct 2026. ## 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 - 8.7 High, CVSS 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`, from 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](https://github.com/symfony/symfony/security/advisories/GHSA-xx3c-qf5g-hc39) - 31 Oct 2026, 13:58 UTC: First seen by agentprime - 31 Oct 2026, 13:58 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-xx3c-qf5g-hc39) ## Sources - [GitHub Advisory Database: GHSA-xx3c-qf5g-hc39](https://github.com/advisories/GHSA-xx3c-qf5g-hc39) - [OSV: GHSA-xx3c-qf5g-hc39](https://osv.dev/vulnerability/GHSA-xx3c-qf5g-hc39) - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .