{
"id": "GHSA-pw9p-jvrm-f7rm",
"aliases": [
"CVE-2026-48979"
],
"details": "## Impact\n\n`Psl\\H2\\ServerConnection` does not validate that the total bytes received in DATA frames match the `content-length` header declared in the HEADERS frame, in violation of RFC 9113 §8.1.1.\n\nA malicious client can:\n- Send more DATA bytes than declared, smuggling additional content past application-level size limits.\n- Send fewer DATA bytes than declared and close the stream early, causing applications that trust the declared length to behave incorrectly.\n\nThe vulnerability is only reachable for consumers using `Psl\\H2\\ServerConnection` directly to accept untrusted client traffic. The high-level `Psl\\HTTP\\Server` is in active development and was not yet released at the time of this advisory; consumers of documented high-level PSL APIs are not affected.\n\n## Patches\n\nFixed in [6.1.2](https://github.com/php-standard-library/php-standard-library/releases/tag/6.1.2) and [6.2.1](https://github.com/php-standard-library/php-standard-library/releases/tag/6.2.1).\n\n- Parses and validates the `content-length` header on incoming HEADERS (server-side only — clients do not enforce this per RFC 9110 §9.3.2).\n- Tracks cumulative DATA frame payload length per stream.\n- Throws `StreamException` on mismatch or overflow.\n\nRegression tests landed in [#781](https://github.com/php-standard-library/php-standard-library/pull/781), 9 of the new tests fail against the pre-fix code, proving the validation boundary is enforced.\n\n## Workarounds\n\nNone at the protocol layer. Applications using `Psl\\H2\\ServerConnection` directly should upgrade.\n\n## Resources\n\n- RFC 9113 §8.1.1 (HTTP/2 request/response exchange)\n- RFC 9110 §8.6 (content-length header)\n- https://github.com/php-standard-library/php-standard-library/releases/tag/6.1.2\n- https://github.com/php-standard-library/php-standard-library/releases/tag/6.2.1",
"summary": "PHP Standard Library: HTTP/2 server-side missing content-length validation enables request smuggling",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.1.0"
},
{
"fixed": "6.1.2"
}
]
}
],
"package": {
"name": "php-standard-library/h2",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.2.1"
}
]
}
],
"package": {
"name": "php-standard-library/h2",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.1.0"
},
{
"fixed": "6.1.2"
}
]
}
],
"package": {
"name": "php-standard-library/php-standard-library",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.2.1"
}
]
}
],
"package": {
"name": "php-standard-library/php-standard-library",
"ecosystem": "Packagist"
}
}
],
"modified": "2026-06-26T20:55:55Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"published": "2026-06-26T20:55:55Z",
"references": [
{
"url": "https://github.com/php-standard-library/php-standard-library/security/advisories/GHSA-pw9p-jvrm-f7rm",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48979",
"type": "ADVISORY"
},
{
"url": "https://github.com/php-standard-library/php-standard-library",
"type": "PACKAGE"
},
{
"url": "https://github.com/php-standard-library/php-standard-library/releases/tag/6.1.2",
"type": "WEB"
},
{
"url": "https://github.com/php-standard-library/php-standard-library/releases/tag/6.2.1",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-444"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-06-17T21:16:23Z",
"github_reviewed_at": "2026-06-26T20:55:55Z"
}
}