CVE-2026-48979PHP Standard Library: HTTP/2 server-side missing content-length validation enables request smuggling
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-444
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Jun 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
php-standard-library php-standard-library php_standard_library:php_standard_library (from the name) | from 6.1.0, < 6.1.2; from 6.2.0, < 6.2.1 | CNA record |
php-standard-library php-standard-library/h2 php_standard_library:h2 (from the name) | from 6.1.0, < 6.1.2; from 6.2.0, < 6.2.1 | CNA record |
References
- https://github.com/php-standard-library/php-standard-library/security/advisories/GHSA-pw9p-jvrm-f7rmx-refsource-confirm
- https://github.com/php-standard-library/php-standard-library/releases/tag/6.1.2x-refsource-misc
- https://github.com/php-standard-library/php-standard-library/releases/tag/6.2.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.