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CVE-2026-48979: PHP Standard Library: HTTP/2 server-side missing content-length validation enables request smuggling

high Affects php-standard-library/h2, php-standard-library/php-standard-library. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

PHP Standard Library: HTTP/2 server-side missing content-length validation enables request smuggling

Package
php-standard-library/h2 Composer
Affected versions
>=6.1.0 and <6.1.2 or >=6.2.0 and <6.2.1
Fixed in
6.1.2, 6.2.1
Severity
high  CVSS 7.5
Exploitation
not on CISA KEV · EPSS 0% (18.8th percentile)
Published
2026-06-26
Source
osv.dev

References

PHP Standard Library: HTTP/2 server-side missing content-length validation enables request smuggling

Package
php-standard-library/php-standard-library Composer
Affected versions
>=6.1.0 and <6.1.2 or >=6.2.0 and <6.2.1
Fixed in
6.1.2, 6.2.1
Severity
high  CVSS 7.5
Exploitation
not on CISA KEV · EPSS 0% (18.8th percentile)
Published
2026-06-26
Source
osv.dev

References

CWE-444
NVD recordphp-standard-library/h2 advisoriesphp-standard-library/php-standard-library advisories

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