What is CVE-2026-48736?

CVE-2026-48736 is a high-severity vulnerability in Sensiolabs Symfony, classified under Incomplete List of Disallowed Inputs. CVSS score: 8.6/10. Published 2026-07-14.

How severe is CVE-2026-48736?

High severity. CVSS v3 base score is 8.6 out of 10.

SSRF in Sensiolabs Symfony

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.

Published 2026-07-14 · last modified 2026-07-16.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.6th percentile), scored 2026-10-13.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Sensiolabs Symfony
Symfony Http-Client — versions >= 5.4.0, < 5.4.53
Symfony Http-Foundation — versions >= 6.0.0-BETA1, < 6.4.41, >= 7.0.0-BETA1, < 7.4.13, >= 8.0.0-BETA1, < 8.0.13
Symfony — versions >= 5.4.0, < 5.4.53, >= 6.0.0-BETA1, < 6.4.41, >= 7.0.0-BETA1, < 7.4.13

Weakness classification (CWE)

References

github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755 (Patch, Vendor Advisory)
github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2 (Patch)
github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e (Patch)
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)

Frequently asked questions

What is CVE-2026-48736?: CVE-2026-48736 is a high-severity vulnerability in Sensiolabs Symfony, classified under Incomplete List of Disallowed Inputs. CVSS score: 8.6/10. Published 2026-07-14.
How severe is CVE-2026-48736?: High severity. CVSS v3 base score is 8.6 out of 10.