CVE-2026-48736Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient
Updated under an hour ago ()
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It affects symfony and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
- Weakness (CWE)
- CWE-184, CWE-918
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
symfony symfony symfony:symfony (from the name) | from 5.4.0, < 5.4.53; from 6.0.0-BETA1, < 6.4.41; from 7.0.0-BETA1, < 7.4.13; from 8.0.0-BETA1, < 8.0.13 | CNA record |
symfony http-client symfony:http_client (from the name) | from 5.4.0, < 5.4.53 | CNA record |
symfony http-foundation symfony:http_foundation (from the name) | from 6.0.0-BETA1, < 6.4.41; from 7.0.0-BETA1, < 7.4.13; from 8.0.0-BETA1, < 8.0.13 | CNA record |
sensiolabs symfony sensiolabs:symfony | from 5.4.0 before 5.4.43; from 6.4.0 before 6.4.41; from 7.0.0 before 7.4.13; from 8.0.0 before 8.0.13 | NVD |
References
- https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755x-refsource-confirm, patch, vendor-advisory
- https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2x-refsource-misc, patch
- https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65ex-refsource-misc, patch
- https://github.com/symfony/symfony/releases/tag/v5.4.53x-refsource-misc, release-notes
- https://github.com/symfony/symfony/releases/tag/v6.4.41x-refsource-misc, release-notes
- https://github.com/symfony/symfony/releases/tag/v7.4.13x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.