An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0…
Priority LOW 38CWE-203Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-203.
Summary
An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. The UriSigner was subject to timing attacks. This is related to symfony/http-kernel.
Why it matters now
EPSS 0.01338 71st percentileScored 2026-11-07
Fix Fixed symfony/http-kernel (Packagist): 2.8.52, 3.4.35, 4.2.12 +1symfony/symfony (Packagist): 2.8.52, 3.4.35, 4.2.12 +1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | symfony/http-kernel (Packagist) | 2.2.0 to before 2.8.52 | 2.8.52 | Patch available | GHSA-q8hg-pf8v-cxrv |
| — | symfony/http-kernel (Packagist) | 3.0.0 to before 3.4.35 | 3.4.35 | Patch available | GHSA-q8hg-pf8v-cxrv |
| — | symfony/http-kernel (Packagist) | 4.0.0 to before 4.2.12 | 4.2.12 | Patch available | GHSA-q8hg-pf8v-cxrv |
| — | symfony/http-kernel (Packagist) | 4.3.0 to before 4.3.8 | 4.3.8 | Patch available | GHSA-q8hg-pf8v-cxrv |
| — | symfony/symfony (Packagist) | 2.2.0 to before 2.8.52 | 2.8.52 | Patch available | GHSA-q8hg-pf8v-cxrv |
| — | symfony/symfony (Packagist) | 3.0.0 to before 3.4.35 | 3.4.35 | Patch available | GHSA-q8hg-pf8v-cxrv |
| — | symfony/symfony (Packagist) | 4.0.0 to before 4.2.12 | 4.2.12 | Patch available | GHSA-q8hg-pf8v-cxrv |
| — | symfony/symfony (Packagist) | 4.3.0 to before 4.3.8 | 4.3.8 | Patch available | GHSA-q8hg-pf8v-cxrv |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- symfony/http-kernel (Packagist) Vendor— Affected 2.2.0 to before 2.8.52 Fixed in 2.8.52 Patch available GHSA-q8hg-pf8v-cxrv
- symfony/http-kernel (Packagist) Vendor— Affected 3.0.0 to before 3.4.35 Fixed in 3.4.35 Patch available GHSA-q8hg-pf8v-cxrv
- symfony/http-kernel (Packagist) Vendor— Affected 4.0.0 to before 4.2.12 Fixed in 4.2.12 Patch available GHSA-q8hg-pf8v-cxrv
- symfony/http-kernel (Packagist) Vendor— Affected 4.3.0 to before 4.3.8 Fixed in 4.3.8 Patch available GHSA-q8hg-pf8v-cxrv
- symfony/symfony (Packagist) Vendor— Affected 2.2.0 to before 2.8.52 Fixed in 2.8.52 Patch available GHSA-q8hg-pf8v-cxrv
- symfony/symfony (Packagist) Vendor— Affected 3.0.0 to before 3.4.35 Fixed in 3.4.35 Patch available GHSA-q8hg-pf8v-cxrv
- symfony/symfony (Packagist) Vendor— Affected 4.0.0 to before 4.2.12 Fixed in 4.2.12 Patch available GHSA-q8hg-pf8v-cxrv
- symfony/symfony (Packagist) Vendor— Affected 4.3.0 to before 4.3.8 Fixed in 4.3.8 Patch available GHSA-q8hg-pf8v-cxrv
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* | 2.8.0 – 2.8.50; 3.4.0 – 3.4.34; 4.2.0 – 4.2.11; 4.3.0 – 4.3.7 | Vulnerable | sensiolabs |
| cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* | 30 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | 31 | Vulnerable | Fedoraproject |
- cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* Versions 2.8.0 – 2.8.50; 3.4.0 – 3.4.34; 4.2.0 – 4.2.11; 4.3.0 – 4.3.7 Vulnerable ·sensiolabs
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
Remediation
- Fix · GHSA-q8hg-pf8v-cxrv symfony/http-kernel (Packagist) Fixed in 2.8.52 Advisory →
- Fix · GHSA-q8hg-pf8v-cxrv symfony/http-kernel (Packagist) Fixed in 3.4.35 Advisory →
- Fix · GHSA-q8hg-pf8v-cxrv symfony/http-kernel (Packagist) Fixed in 4.2.12 Advisory →
- Fix · GHSA-q8hg-pf8v-cxrv symfony/http-kernel (Packagist) Fixed in 4.3.8 Advisory →
- Fix · GHSA-q8hg-pf8v-cxrv symfony/symfony (Packagist) Fixed in 2.8.52 Advisory →
- Fix · GHSA-q8hg-pf8v-cxrv symfony/symfony (Packagist) Fixed in 3.4.35 Advisory →
- Fix · GHSA-q8hg-pf8v-cxrv symfony/symfony (Packagist) Fixed in 4.2.12 Advisory →
- Fix · GHSA-q8hg-pf8v-cxrv symfony/symfony (Packagist) Fixed in 4.3.8 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2019-18887
- 2026-10-03 Alias added: GHSA-q8hg-pf8v-cxrv
References
Advisory 5
Other 11
- https://symfony.com/blog/symfony-4-3-8-released
- https://github.com/symfony/symfony/releases/tag/v4.3.8
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2019-18887.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-18887.yaml
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ
- https://lists.fedoraproject.org/archives/list/[email protected]/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX
- https://lists.fedoraproject.org/archives/list/[email protected]/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA
- https://lists.fedoraproject.org/archives/list/[email protected]/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ
- https://symfony.com/cve-2019-18887
Sources
- CVE-2019-18887 · CVE Program
- CVE-2019-18887 · NVD
- FIRST EPSS
- GHSA-q8hg-pf8v-cxrv · GitHub Advisory Database · CC BY 4.0
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