CVE-2026-48736: sensiolabs symfony Incomplete List of Disallowed Inputs
Vulnerability summary
CVE-2026-48736 is a high (CVSS 8.6) Incomplete List of Disallowed Inputs vulnerability in sensiolabs symfony. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 14-07-2026PublishedVulnerability first disclosed.
- 15-07-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
8 scores · 6 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
- OSV · WolfiEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
- OSV · ChainguardEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
- NVDNIST6.9MediumCVSS: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
- OSV · UbuntuEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
0.00 pp
From 0.57% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-184Incomplete List of Disallowed InputsThe product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.
- CWE-918Server-Side Request Forgery (SSRF)The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Affected systems
Chainguard4 products
- nextcloud-server-31All versions (No fix recorded)
- nextcloud-server-32< 32.0.11-r2
- nextcloud-server-33< 33.0.5-r4
- nextcloud-server-34< 34.0.1-r0
Symfony3 products
- http-client≥ 5.4.0, < 5.4.53
- http-foundation≥ 6.0.0-BETA1, < 6.4.41 | ≥ 7.0.0-BETA1, < 7.4.13 | ≥ 8.0.0-BETA1, < 8.0.13
- symfony≥ 5.4.0, < 5.4.53 | ≥ 6.0.0-BETA1, < 6.4.41 | ≥ 7.0.0-BETA1, < 7.4.13 | ≥ 8.0.0-BETA1, < 8.0.13
Wolfi2 products
- nextcloud-server-32< 32.0.11-r2
- nextcloud-server-33< 33.0.5-r4
Debian1 product
- symfony< 5.4.53+dfsg-0+deb12u1 | < 6.4.41+dfsg-0+deb13u1 | < 7.4.13+dfsg-1
Sensiolabs1 product
- symfony≥ 5.4.0, < 5.4.43 | ≥ 6.4.0, < 6.4.41 | ≥ 7.0.0, < 7.4.13 | ≥ 8.0.0, < 8.0.13
Ubuntu1 product
- symfonyAll versions (No fix recorded)
6 vendors · 12 products
References
12 links- github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755X Refsource CONFIRMAdvisoryPatchVendor Advisory
- github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2X Refsource MISCREPORTFIXPatch
- github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65eX Refsource MISCREPORTFIXPatch
- symfony.com/blog/…REPORT
