EUVD-2026-37798
GHSA-pw9p-jvrm-f7rm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
HTTP/2 server is network-reachable with low complexity and no auth or interaction; impact is integrity-only via smuggling/truncation, with no direct confidentiality or availability loss.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
HTTP/2 request smuggling in PHP Standard Library (PSL) versions 6.1.0, 6.1.1, and 6.2.0 lets remote unauthenticated clients desynchronize stream boundaries in Psl\H2\ServerConnection by sending DATA frame totals that disagree with the declared content-length header. Only applications that consume the low-level H2 server connection directly to accept untrusted traffic are exposed; high-level PSL APIs are unaffected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application directly instantiates Psl\H2\ServerConnection from PSL 6.1.0, 6.1.1, or 6.2.0 to terminate untrusted HTTP/2 client traffic - applications that consume only the documented high-level PSL HTTP APIs are not reachable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N (7.5 High) accurately reflects a network-reachable, unauthenticated integrity-only smuggling primitive - confidentiality and availability are not directly affected, but downstream integrity impact can be severe depending on what the application trusts. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker opens an HTTP/2 stream against a PSL-backed server, sends a HEADERS frame declaring content-length: 100, then sends DATA frames totaling either 200 bytes (smuggling 100 extra bytes past size limits or into a co-tenant request boundary) or only 50 bytes followed by END_STREAM (forcing the application to act on a truncated body it believes is complete). The attacker can use this to bypass application-level size caps, poison logs/queues that key on content-length, or induce inconsistent state in handlers that trust the declared length. … |
| Remediation | Vendor-released patches are available: upgrade to PSL 6.1.2 (https://github.com/php-standard-library/php-standard-library/releases/tag/6.1.2) on the 6.1.x branch or 6.2.1 (https://github.com/php-standard-library/php-standard-library/releases/tag/6.2.1) on the 6.2.x branch, e.g. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory applications for direct PSL H2ServerConnection usage in production environments. …
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External POC / Exploit Code
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