Vulnerability · CVE-2026-123119
The Symfony HttpClient component NoPrivateNetworkHttpClient does not pin the checked IP address of cached hosts, allowing for DNS rebinding to bypass private network restrictions,
Published Nov 5, 2026 · catalog updated Nov 10, 2026 · The Symfony HttpClient component
Last checked Nov 10, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-123119. EPSS is 0.23%. Act only if a listed version of The Symfony HttpClient component is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (The Symfony HttpClient component).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-123824 · Low
- CVE-2026-122053 · Medium
- CVE-2026-118515 · High
- CVE-2026-118514 · Medium
- CVE-2026-123746 · Low
- Severity
- Low2.3
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.23%
- Remediation
- Advisory link
- Affected products
- Debian:12 symfony · Debian:13 symfony · Debian:14 symfony · vendor sensiolabs symfony
The Symfony HttpClient component NoPrivateNetworkHttpClient does not pin the checked IP address of cached hosts, allowing for DNS rebinding to bypass private network restrictions, resulting in enumeration of internal hosts and ports in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11. NoPrivateNetworkHttpClient resolves the host of each request and checks the IP before connecting. It caches the result per host, and passes the IP to the decorated client through the resolve option so that the client connects to the exact IP that was checked. The issue is that resolve was only passed on the first lookup of a host: on subsequent requests, the decorated client resolved the host again on its own. An attacker who controls a host's DNS can exploit this with DNS rebinding by answering the first lookup with a public IP, and subsequent lookups with a private IP, so when an application sends several requests to that host through the same client, the later requests connect to the private IP. This happens, for example, when an application fetches several URLs of a repository provided by a user. The check of the primary_ip in the on_progress callback still aborts the request before anything is sent, but the connection is made, and the error differs depending on whether the port is open or closed. This allows enumerating internal hosts and ports, as in CVE-2024-50342.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- Debian:12 symfony5.4.23+dfsg-1, 5.4.23+dfsg-1+deb12u1, 5.4.23+dfsg-1+deb12u2
- Debian:13 symfony0 → 6.4.50+dfsg-0+deb13u1
- Debian:13 symfony6.4.21+dfsg-2, 6.4.21+dfsg-2+deb13u1, 6.4.24+dfsg-1
- Debian:14 symfony0 → 7.4.23+dfsg-1
- Debian:14 symfony6.4.21+dfsg-2, 6.4.24+dfsg-1, 6.4.25+dfsg-1
- vendor sensiolabs symfonyversion unspecified
How to fix CVE-2026-123119
Upgrade
CVE-2026-123119 lists a fix boundary at 6.4.50+dfsg-0+deb13u1. Compare the installed build with that boundary before you change production.
Version check
Fixed in 6.4.50+dfsg-0+deb13u1 · 10 other ranges on the advisory
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-123119. EPSS is 0.23%. Act only if a listed version of The Symfony HttpClient component is installed.
Which versions are affected?
Compare what you have installed with 5.4.23+dfsg-1, 5.4.23+dfsg-1+deb12u1, 5.4.23+dfsg-1+deb12u2, 0 → 6.4.50+dfsg-0+deb13u1, 6.4.21+dfsg-2, 6.4.21+dfsg-2+deb13u1, 6.4.24+dfsg-1, 0 → 7.4.23+dfsg-1, 6.4.21+dfsg-2, 6.4.24+dfsg-1, 6.4.25+dfsg-1. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition; CWE-918: Server-Side Request Forgery (SSRF). EPSS 0.23%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Nov 5, 2026 · OpenSSF OSV / OSV Scanner
Detected
The Symfony HttpClient component NoPrivateNetworkHttpClient does not pin the checked IP address of cached hosts, allowing for DNS rebinding to bypass private network restrictions, resulting in enumeration of internal hosts and ports in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11. NoPrivateNetworkHttpClient resolves the host of each request an
Nov 6, 2026 · OpenSSF OSV / OSV Scanner
Updated
The Symfony HttpClient component NoPrivateNetworkHttpClient does not pin the checked IP address of cached hosts, allowing for DNS rebinding to bypass private network restrictions, resulting in enumeration of internal hosts and ports in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11. NoPrivateNetworkHttpClient resolves the host of each request an
Nov 10, 2026 · Trivy Vulnerability DB
Fix available
symfony fixed in 6.4.50+dfsg-0+deb13u1; symfony fixed in 7.4.23+dfsg-1
Nov 10, 2026 · Trivy Vulnerability DB
Fix available
symfony fixed in 6.4.50+dfsg-0+deb13u1
Nov 10, 2026 · Trivy Vulnerability DB
Fix available
symfony fixed in 7.4.23+dfsg-1
Nov 10, 2026 · Trivy Vulnerability DB
Updated
The Symfony HttpClient component NoPrivateNetworkHttpClient does not pin the checked IP address of cached hosts, allowing for DNS rebinding to bypass private network restrictions, resulting in enumeration of internal hosts and ports in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11. NoPrivateNetworkHttpClient resolves the host of each request an
Sources
- CVE.orgVulnerability recordCVE-2026-123119
The Symfony HttpClient component NoPrivateNetworkHttpClient does not pin the checked IP address of cached hosts, allowing for DNS rebinding to bypass private network restrictions, resulting in enumeration of internal hosts and ports in Symfony versions prior to 5.4.56, 6.x prior
cve.org - OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-123119osv.dev
- Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-123119
The Symfony HttpClient component NoPrivateNetworkHttpClient does not pin the checked IP address of cached hosts, allowing for DNS rebinding to bypass private network restrictions, resulting in enumeration of internal hosts and ports in Symfony versions prior to 5.4.56, 6.x prior
osv.dev
References
Freshness
Last verified in this catalog Nov 9, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- OpenSSF OSV / OSV ScannerNov 10, 2026
- Trivy Vulnerability DBNov 10, 2026
- CVE.orgNov 9, 2026