Security Digest · Vulnerability record
CVE-2025-22871: RoadRunner is at risk of HTTP Request/Response Smuggling through vulnerable dependency
The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines.
CVSS 9.1 Critical EPSS 0.8% · p57
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.8%, percentile 57: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 57% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
spiral/roadrunner(Composer (PHP)) < 2025.1.0, fixed in 2025.1.0. Check your lockfile, including transitive dependencies.
What it is
The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines. This can permit request smuggling if a net/http server is used in conjunction with a server that incorrectly accepts a bare LF as part of a chunk-ext.
From the GitHub advisory
The net/http package dependency used by RoadRunner improperly accepts a bare LF as a line terminator in chunked data chunk-size lines. This can permit request smuggling if a net/http server is used in conjunction with a server that incorrectly accepts a bare LF as part of a chunk-ext.
Weakness type: CWE-444, CWE-1395.
Product: spiral/roadrunner (Composer (PHP)) · Assigned by: Go · Published: 2025-04-08
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| Composer (PHP) | spiral/roadrunner | < 2025.1.0 | 2025.1.0 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Go standard library | net/http/internal | < 1.23.8, 1.24.0-0 < 1.24.2 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 0.83% probability of exploitation activity in the next 30 days; percentile 57.
Timeline
- — CVE record published by Go
- — GitHub-reviewed advisory GHSA-g9pc-8g42-g6vq published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-g9pc-8g42-g6vq github.com
- CVE.org record CVE-2025-22871 cve.org
- NVD entry CVE-2025-22871 nvd.nist.gov
Other references from the CVE record and advisory
- go.dev go.dev
- go.dev go.dev
- groups.google.com groups.google.com
- pkg.go.dev pkg.go.dev
- openwall.com openwall.com
- cert-portal.siemens.com cert-portal.siemens.com
- github.com github.com
- github.com github.com
- github.com github.com
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