CVE-2026-3945: high-severity vulnerability in tinyproxy
tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.6%
An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol without properly validating overflow conditions (e.g., errno == ERANGE).
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
tinyproxy · tinyproxyRelated CVEs — tinyproxy
In the same product, most dangerous first.
CVE-2026-54388CRITICALTinyproxy - HTTP Request Smuggling via Duplicate Content-Length HeadersEPSS 0.4%CVE-2026-54387CRITICALTinyproxy - HTTP Request Smuggling via CL/TE DesynchronizationEPSS 0.4%CVE-2026-55202HIGHTinyproxy - Stathost Detection Bypass via Host Header ManipulationEPSS 0.4%CVE-2026-125371MEDIUMTinyproxy through 1.11.3 Hostname ACL Allow-List Bypass via Suffix MatchEPSS —