Security Vulnerabilities
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based authentication middleware. Traefik's forwarded-header sanitization logic targets only canonical header names (e.g., X-Forwarded-Proto) and does not strip or normalize alias variants that use underscores instead of dashes (e.g., X_Forwarded_Proto). These unsanitized alias headers are forwarded intact to the authentication backend. When the backend normalizes underscore and dash header forms equivalently, an attacker can inject spoofed trust context — such as a trusted scheme or host — through the alias headers and bypass authentication on protected routes without valid credentials. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
CVSS Score
7.8
EPSS Score
0.001
Published
2026-04-30
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the percent-encoded raw path. When a dot (or multiple dots) appears in the prefix portion of the URL, the raw path after stripping becomes a dot-segment (e.g. /./admin/secret). ForwardAuth receives this dot-segment path in X-Forwarded-Uri, which does not match the protected path patterns and therefore allows the request through. The backend then normalizes the dot-segment to the real path per RFC 3986 and serves the protected content An unauthenticated attacker can exploit this against any backend that performs dot-segment normalization. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
CVSS Score
7.8
EPSS Score
0.001
Published
2026-04-30
CVE-2026-40949 is a buffer overflow vulnerability in the Secure Access
Windows client prior to 14.50. Attackers with local control of the
Windows client can use it to trigger a denial of service.
CVSS Score
6.8
EPSS Score
0.0
Published
2026-04-30
FRRouting before 10.5.3 contains an integer overflow vulnerability in seven OSPF Traffic Engineering and Segment Routing TLV parser functions where a uint16_t accumulator variable truncates uint32_t values returned by the TLV_SIZE() macro, causing the loop termination condition to fail while pointer advancement continues unchecked. Attackers with an established OSPF adjacency can send a crafted LS Update packet with a malicious Type 10 or Type 11 Opaque LSA to trigger out-of-bounds memory reads and crash all affected routers in the OSPF area or autonomous system.
CVSS Score
6.0
EPSS Score
0.0
Published
2026-04-30
CVE-2026-33449 is a buffer overflow in a message handling function of
the Secure Access client prior to 14.50. Attackers with control of
a modified server can send a cryptographically valid message to the
client, overwriting a small portion of memory conceivably leading to a
denial of service.
CVSS Score
2.3
EPSS Score
0.0
Published
2026-04-30
CVE-2026-33450 is an out of bounds read vulnerability in the Secure
Access MacOS client prior to 14.50. Attackers with control of a modified
server can send a malformed packet to the client causing a denial of
service.
CVSS Score
2.3
EPSS Score
0.0
Published
2026-04-30
CVE-2026-33451 is an arbitrary read/write vulnerability in the Secure
Access Windows client prior to 14.50. Attackers with local control of
the Windows client can send malformed data to an API and elevate their
level of privilege to system.
CVSS Score
8.5
EPSS Score
0.0
Published
2026-04-30
CVE-2026-33452 is a buffer overflow vulnerability in the Secure Access
Windows client prior to 14.50. Attackers with local control of the
Windows client can use it to ‘blue screen’ the system.
CVSS Score
5.9
EPSS Score
0.0
Published
2026-04-30
CVE-2026-33448 is a format string vulnerability in the logging subsystem
of Secure Access client for MacOS prior to 14.50. Attackers with
control of a modified server can force the client to dump the contents
of a small portion of memory to the log files potentially revealing
secrets.
CVSS Score
4.8
EPSS Score
0.0
Published
2026-04-30
CVE-2026-33446 is a buffer overflow in the authentication sub-system of
the Secure Access client prior to 14.50. Attackers with control of a
modified server can send a special packet that can overwrite a small
portion of memory conceivably leading to memory corruption or a denial
of service.
CVSS Score
2.3
EPSS Score
0.001
Published
2026-04-30