# symfony/serializer (Packagist) vulnerabilities

4 known vulnerabilities (2 high, 2 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://packagist.org/packages/symfony/serializer

## Advisories (4)

### [CVE-2026-122053](https://cve.now/CVE-2026-122053): Symfony: ObjectNormalizer Dotted-Key Property-Path Traversal Bypasses #\[Ignore\] on Nested Objects

- Severity: Medium 6.9
- Published: Nov 6, 2026
- Affected: from 5.4.41, fixed in 5.4.56; from 6.4.9, fixed in 6.4.50; from 7.0.9, fixed in 7.1.0; from 7.1.2, fixed in 7.4.23; from 8.0.0, fixed in 8.1.11.

### [CVE-2026-118515](https://cve.now/CVE-2026-118515): Symfony: The Serializer Builds UploadedFile Objects From Request Data, Letting a Client Point an Upload at Any Server File

- Severity: High 8.4
- Published: Nov 6, 2026
- Affected: fixed in 5.4.56; from 6.0.0, fixed in 6.4.50; from 7.0.0, fixed in 7.4.23; from 8.0.0, fixed in 8.1.11.

### [CVE-2026-121623](https://cve.now/CVE-2026-121623): Symfony: DataUriNormalizer Opens Data URIs With a Non-Lowercase Scheme as Local Files, Letting a Client Read Any Server File

- Severity: High 8.2
- Published: Nov 6, 2026
- Affected: fixed in 5.4.56; from 6.0.0, fixed in 6.4.50; from 7.0.0, fixed in 7.4.23; from 8.0.0, fixed in 8.1.11.

### [CVE-2021-41270](https://cve.now/CVE-2021-41270): CSV Injection in Symfony

- Severity: Medium 6.5
- Published: Nov 24, 2021
- Affected: from 5.0.0, fixed in 5.3.12; from 4.1.0, fixed in 4.4.35.

---

Source: cve.now
Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.
Page: https://cve.now/packages/packagist/symfony/serializer
Site guide for agents: https://cve.now/llms.txt
Uses NVD data; not endorsed by NVD.