CVE-2026-48979— PHP Standard Library: HTTP/2 server-side missing content-length validation enables request smuggling
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-48979
Vulnerability Information
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Vulnerability Title
PHP Standard Library: HTTP/2 server-side missing content-length validation enables request smuggling
Source: NVD (National Vulnerability Database)
Vulnerability Description
PHP Standard Library (PSL) is set of APIs covering async, collections, networking, I/O, cryptography, terminal UI, etc. In versions 6.1.0, 6.1.1 and 6.2.0, the Psl\H2\ServerConnection does not validate that the total bytes received in DATA frames match the content-length header declared in the HEADERS frame, allowing request smuggling. This is in violation of RFC 9113 §8.1.1. A malicious client is able to send more DATA bytes than declared, smuggling additional content past application-level size limits and send fewer DATA bytes than declared and close the stream early, causing applications that trust the declared length to behave incorrectly. The vulnerability is only reachable for consumers using Psl\H2\ServerConnection directly to accept untrusted client traffic. Consumers of documented high-level PSL APIs are not affected. This issue has been fixed in versions 6.1.2 and 6.2.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| php-standard-library | php-standard-library | >= 6.1.0, < 6.1.2 | - | |
| php-standard-library | php-standard-library/h2 | >= 6.1.0, < 6.1.2 | - |
II. Public POCs for CVE-2026-48979
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-48979 (2)
Vendor Advisories for CVE-2026-48979 (1)
IV. Related Vulnerabilities
Same weakness: CWE-444
- CVE-2026-54388
Tinyproxy - HTTP Request Smuggling via Duplicate Content-Len - CVE-2026-54387
Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronizati - CVE-2026-50020
Netty's HttpObjectDecoder skips arbitrary initial control ch - CVE-2026-6338
HTTP request smuggling in Kong Enteprise Gateway - CVE-2026-41853
Spring Framework Multipart Request Smuggling in Spring MVC a
V. Comments for CVE-2026-48979
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