High severity8.6NVD Advisory· Published Jul 14, 2026· Updated Jul 16, 2026
CVE-2026-48736
CVE-2026-48736
Description
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 5.4.0 to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, NoPrivateNetworkHttpClient and IpUtils::PRIVATE_SUBNETS omitted IPv6 transition prefixes such as 6to4, NAT64, Teredo, and IPv4-compatible IPv6, allowing attacker-supplied URLs to represent private IPv4 targets in forms that IpUtils::isPrivateIp() did not block. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/http-clientPackagist | >= 5.4.0, < 5.4.53 | 5.4.53 |
symfony/http-foundationPackagist | >= 6.4.0, < 6.4.41 | 6.4.41 |
symfony/http-foundationPackagist | >= 7.0.0, < 7.4.13 | 7.4.13 |
symfony/http-foundationPackagist | >= 8.0.0, < 8.0.13 | 8.0.13 |
symfony/symfonyPackagist | >= 5.4.0, < 5.4.53 | 5.4.53 |
symfony/symfonyPackagist | >= 6.4.0, < 6.4.41 | 6.4.41 |
symfony/symfonyPackagist | >= 7.0.0, < 7.4.13 | 7.4.13 |
symfony/symfonyPackagist | >= 8.0.0, < 8.0.13 | 8.0.13 |
Affected products
5- osv-coords5 versionspkg:apk/chainguard/nextcloud-server-32pkg:apk/chainguard/nextcloud-server-33pkg:apk/chainguard/nextcloud-server-34pkg:apk/wolfi/nextcloud-server-32pkg:apk/wolfi/nextcloud-server-33
< 32.0.11-r2+ 4 more
- (no CPE)range: < 32.0.11-r2
- (no CPE)range: < 33.0.5-r4
- (no CPE)range: < 34.0.1-r0
- (no CPE)range: < 32.0.11-r2
- (no CPE)range: < 33.0.5-r4
Patches
Vulnerability mechanics
References
11- github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2nvdPatchWEB
- github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65envdPatchWEB
- github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755nvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-38cx-cq6f-5755ghsaADVISORY
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-client/CVE-2026-48736.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2026-48736.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48736.yamlghsaWEB
- github.com/symfony/symfony/releases/tag/v5.4.53nvdRelease Notes
- github.com/symfony/symfony/releases/tag/v6.4.41nvdRelease Notes
- github.com/symfony/symfony/releases/tag/v7.4.13nvdRelease Notes
- symfony.com/cve-2026-48736ghsaWEB
News mentions
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