CVE-2026-48736 json
Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient
published 2026-06-15 4 mo ago modified 2026-09-10 1 mo ago also GHSA-38cx-cq6f-5755 , EUVD-2026-44372
- cvss
- 8.6
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 47%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist symfony/http-client 5.4.53
- packagist symfony/http-foundation 6.4.41, 7.4.13, 8.0.13
- packagist symfony/symfony 5.4.53, 6.4.41, 7.4.13, 8.0.13
- sensiolabs symfony 5.4.43, 6.4.41, 7.4.13, 8.0.13
- symfony Debian 12 5.4.53+dfsg-0+deb12u1
- symfony Debian 13 6.4.41+dfsg-0+deb13u1
- symfony Debian 14 7.4.13+dfsg-1
debian advisories DEBIAN-CVE-2026-48736
- github.com/symfony/symfony@8276536 commit
- github.com/symfony/symfony@85b8315 commit
- github.com/symfony/symfony/releases/tag/v5.4.53 release
- github.com/symfony/symfony/releases/tag/v6.4.41 release
- github.com/symfony/symfony/releases/tag/v7.4.13 release
- github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755 advisory
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | 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 |
| CNA | 4.0 | 6.9 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | symfony/http-client | >=5.4.0, <5.4.53 |
5.4.53 |
| packagist | symfony/http-foundation | >=6.4.0, <6.4.41 >=7.0.0, <7.4.13 >=8.0.0, <8.0.13 |
6.4.41 7.4.13 8.0.13 |
| packagist | symfony/symfony | >=5.4.0, <5.4.53 >=6.4.0, <6.4.41 >=7.0.0, <7.4.13 >=8.0.0, <8.0.13 |
5.4.53 6.4.41 7.4.13 8.0.13 |
Affected products
- symfony symfony
- symfony http-client
- symfony http-foundation
Classification
References
-
github.com
/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2
web, patch
-
github.com
/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e
web, patch
-
github.com
/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755
web, patch, vendor-advisory
-
github.com
/symfony/symfony/releases/tag/v5.4.53
release-notes
-
github.com
/symfony/symfony/releases/tag/v6.4.41
release-notes
-
github.com
/symfony/symfony/releases/tag/v7.4.13
release-notes
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/http-client/CVE-2026-48736.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2026-48736.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48736.yaml
web
-
github.com
/symfony/symfony
package
-
symfony.com
/cve-2026-48736
web
Sources
- CVE List CVE-2026-48736
- GitHub Advisory GHSA-38cx-cq6f-5755
- NVD CVE-2026-48736
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