DEBIAN-CVE-2026-45372

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2026-45372
Published: 29 May 2026, 20:16
Last modified:30 May 2026, 10:00

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.9 CRITICAL
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

29 May 2026, 20:16
Published
Vulnerability first disclosed
30 May 2026, 10:00
Last Modified
Vulnerability information updated

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.9CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

Affected Systems

  • debian•cpp-httplib

    all | all | all

References (1)