CVE-2025-26803: The http parser in Phusion Passenger 6.0.21 through 6.0.25 before 6.0.26 allows a denial of service during parsing of a request with an invalid HTTP method.

PriorityP336high7.5CVSS 3.1

AVNACLPRNUINSUCNINAH

EPSS

0.57%

43.5th percentile

The http parser in Phusion Passenger 6.0.21 through 6.0.25 before 6.0.26 allows a denial of service during parsing of a request with an invalid HTTP method.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
debian	passenger	< passenger 6.0.26+ds-1 (forky)	passenger 6.0.26+ds-1 (forky)
phusion	passenger	>= 0 < 6.0.26+ds-1	6.0.26+ds-1
phusion	passenger	>= 0 < 6.0.26+ds-1	6.0.26+ds-1
phusion	passenger	>= 6.0.21 < 6.0.26	6.0.26
phusion	passenger	>= 6.0.21 < 6.0.26	6.0.26

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

osv7.5HIGH

vendor_debian5.3LOW

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.