CVE-2026-48736: symfony SSRF — Fix

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.

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CVSS v3.1 Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0046

Probability of exploitation

0.38%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-184 CWE-184

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
sensiolabs	symfony	5.4.0 — 5.4.43
sensiolabs	symfony	6.4.0 — 6.4.41
sensiolabs	symfony	7.0.0 — 7.4.13
sensiolabs	symfony	8.0.0 — 8.0.13

References

Advisories & Patches

https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2 https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755

Other References

https://github.com/symfony/symfony/releases/tag/v5.4.53 https://github.com/symfony/symfony/releases/tag/v6.4.41 https://github.com/symfony/symfony/releases/tag/v7.4.13

Frequently Asked Questions

What is CVE-2026-48736? +

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. It has a CVSS v3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-48736? +

CVE-2026-48736 has a CVSS v3.1 score of 8.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-48736? +

CVE-2026-48736 affects products from sensiolabs, specifically: symfony. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-48736? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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