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CVE-2025-66490

Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules

6.9 MediumFix available

Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, , Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
None

Exploit likelihood

0.44%Up 0.4 points since Dec 9, 2025
90%50%10%1%

What each source reports

CVE List Score used 6.9

Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules

Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, , Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.

Record
CVE-2025-66490
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-436
Updated
2026-11-02
EUVDEUVD-2025-201731 6.9

Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, , Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.

Record
EUVD-2025-201731
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-gm3x-23wp-hc2c 6.9

Path Normalization Bypass in Traefik Router + Middleware Rules

Impact

There is a potential vulnerability in Traefik managing the requests using a PathPrefix, Path or PathRegex matcher.

When Traefik is configured to route the requests to a backend using a matcher based on the path; if the request path contains an encoded restricted character from the following set ('/', '', 'Null', ';', '?', '#'), it’s possible to target a backend, exposed using another router, by-passing the middlewares chain.

Example

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: my-service
spec:
  routes:
    - match: PathPrefix(‘/admin/’)
      kind: Rule
      services:
        - name: service-a
          port: 8080
      middlewares:
        - name: my-security-middleware
    - match: PathPrefix(‘/’)
      kind: Rule
      services:
        - name: service-a
          port: 8080

In such a case, the request http://mydomain.example.com/admin%2F will reach the backend service-a without operating the middleware my-security-middleware and passing the security put in place for the /admin/ path.

Patches

For more information

If you have any questions or comments about this advisory, please open an issue.

<details> <summary>Original Description</summary>### Summary A vulnerability exists in Traefik’s path matching logic that allows attackers to bypass access-control middleware (e.g., blocking rules) by using URL-encoded paths. I found this vulnerability while playing PwnSec CTF 2025 with my team @0xL4ugh

Details

Traefik evaluates router rules before decoding or normalizing the request path, but forwards the request after decoding to the backend service. As a result, routes meant to block access to sensitive endpoints (such as internal, beta, or admin endpoints) can be trivially bypassed.

PoC

Traefik configuration used in this issue :

  entryPoints = ["web"]
  rule = "PathPrefix(`/report_note`)"
  priority = 10
  middlewares = ["block-access"]
  service = "flask-service"

[http.middlewares.block-access.replacePathRegex]
  regex = ".*"
  replacement = "/blocked"

The intention is to block all access to /report_note.

However, the following request bypasses the block:

POST /%2freport_note HTTP/1.1
Host: localhost:62814

Impact

Access Control Bypass: Any endpoint intended to be blocked (e.g., admin/debug/beta APIs) can be accessed by URL-encoding slashes or other characters.

This could lead to:

  • Unauthorized access to restricted endpoints
  • Execution of protected internal functionality
  • Potential privilege escalation
  • Bypass of security policies enforced via Traefik routing rules

</details>

Record
GHSA-gm3x-23wp-hc2c
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-436
Updated
2026-11-02
NVD 6.9

Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, , Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.

Record
CVE-2025-66490
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-436
Updated
2026-11-02
OSV 6.9

Traefik doesn't Prevent Path Normalization Bypass in Router + Middleware Rules

Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, , Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.

Record
CVE-2025-66490
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-436
Updated
2026-11-02
OSVGHSA-gm3x-23wp-hc2c 6.9

Path Normalization Bypass in Traefik Router + Middleware Rules

Impact

There is a potential vulnerability in Traefik managing the requests using a PathPrefix, Path or PathRegex matcher.

When Traefik is configured to route the requests to a backend using a matcher based on the path; if the request path contains an encoded restricted character from the following set ('/', '', 'Null', ';', '?', '#'), it’s possible to target a backend, exposed using another router, by-passing the middlewares chain.

Example

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: my-service
spec:
  routes:
    - match: PathPrefix(‘/admin/’)
      kind: Rule
      services:
        - name: service-a
          port: 8080
      middlewares:
        - name: my-security-middleware
    - match: PathPrefix(‘/’)
      kind: Rule
      services:
        - name: service-a
          port: 8080

In such a case, the request http://mydomain.example.com/admin%2F will reach the backend service-a without operating the middleware my-security-middleware and passing the security put in place for the /admin/ path.

Patches

For more information

If you have any questions or comments about this advisory, please open an issue.

<details> <summary>Original Description</summary>### Summary A vulnerability exists in Traefik’s path matching logic that allows attackers to bypass access-control middleware (e.g., blocking rules) by using URL-encoded paths. I found this vulnerability while playing PwnSec CTF 2025 with my team @0xL4ugh

Details

Traefik evaluates router rules before decoding or normalizing the request path, but forwards the request after decoding to the backend service. As a result, routes meant to block access to sensitive endpoints (such as internal, beta, or admin endpoints) can be trivially bypassed.

PoC

Traefik configuration used in this issue :

  entryPoints = ["web"]
  rule = "PathPrefix(`/report_note`)"
  priority = 10
  middlewares = ["block-access"]
  service = "flask-service"

[http.middlewares.block-access.replacePathRegex]
  regex = ".*"
  replacement = "/blocked"

The intention is to block all access to /report_note.

However, the following request bypasses the block:

POST /%2freport_note HTTP/1.1
Host: localhost:62814

Impact

Access Control Bypass: Any endpoint intended to be blocked (e.g., admin/debug/beta APIs) can be accessed by URL-encoding slashes or other characters.

This could lead to:

  • Unauthorized access to restricted endpoints
  • Execution of protected internal functionality
  • Potential privilege escalation
  • Bypass of security policies enforced via Traefik routing rules

</details>

Record
GHSA-gm3x-23wp-hc2c
CVSS 4.0
6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness
CWE-436
Updated
2026-11-02
Show 5 moreShow less
OSVGO-2025-4206 No score

Path Normalization Bypass in Traefik Router + Middleware Rules in github.com/traefik/traefik

Path Normalization Bypass in Traefik Router + Middleware Rules in github.com/traefik/traefik

Record
GO-2025-4206
Updated
2026-11-02
OSVopenSUSE-SU-2026:10020-1 No score

traefik-3.6.6-1.1 on GA media

These are all security issues fixed in the traefik-3.6.6-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10020-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:10143-1 No score

traefik2-2.11.35-1.1 on GA media

These are all security issues fixed in the traefik2-2.11.35-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10143-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02
OSVSUSE-SU-2026:0037-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20251230T014957 2025-12-30T01:49:57Z (jsc#PED-11136).

    Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-4249 CVE-2025-68120 CVE-2025-68120
    • GO-2025-4254 CVE-2025-62190 GHSA-gmx5-frv9-9m9f
    • GO-2025-4255 CVE-2025-12689 GHSA-j5vq-62gr-8v3r
    • GO-2025-4256 CVE-2025-13324 GHSA-x3r8-2hmh-89f5
    • GO-2025-4257 CVE-2025-68476 GHSA-c4p6-qg4m-9jmr
    • GO-2025-4258 CVE-2025-68938 GHSA-cm54-pfmc-xrwx
    • GO-2025-4261 CVE-2025-68939 GHSA-263q-5cv3-xq9g
    • GO-2025-4262 CVE-2025-68945 GHSA-7xq4-mwcp-q8fx
    • GO-2025-4263 CVE-2025-68942 GHSA-898p-hh3p-hf9r
    • GO-2025-4264 CVE-2025-68944 GHSA-f85h-c7m6-cfpm
    • GO-2025-4265 CVE-2025-68946 GHSA-hq57-c72x-4774
    • GO-2025-4266 CVE-2025-68943 GHSA-jhx5-4vr4-f327
    • GO-2025-4267 CVE-2025-68940 GHSA-rrcw-5rjv-vj26
    • GO-2025-4268 CVE-2025-68941 GHSA-xfq3-qj7j-4565

  • Update to version 0.0.20251222T181535 2025-12-22T18:15:35Z (jsc#PED-11136).

    Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-4241 CVE-2025-11393 GHSA-cc8c-28gj-px38
    • GO-2025-4242 CVE-2025-13888 GHSA-pcqx-8qww-7f4v
    • GO-2025-4243 GHSA-wh6m-h6f4-rjf4
    • GO-2025-4244 CVE-2025-68274 GHSA-c623-f998-8hhv
    • GO-2025-4245 CVE-2025-68156 GHSA-cfpf-hrx2-8rv6
    • GO-2025-4247 CVE-2025-13352 GHSA-jf5h-xfw4-p8gp
    • GO-2025-4250 CVE-2025-14764 GHSA-3g75-q268-r9r6

  • Update to version 0.0.20251216T193914 2025-12-16T19:39:14Z (jsc#PED-11136).

    Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-4239 CVE-2025-68113 GHSA-6gvq-jcmp-8959
    • GO-2025-4240 CVE-2025-13281 GHSA-r6j8-c6r2-37rr

  • Update to version 0.0.20251216T162327 2025-12-16T16:23:27Z (jsc#PED-11136).

    Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2024-3036 CVE-2024-41265 GHSA-vw7g-3cc7-7rmh
    • GO-2024-3057 CVE-2024-41260 GHSA-9v35-4xcr-w9ph
    • GO-2025-3437 GHSA-274v-mgcv-cm8j
    • GO-2025-3465 CVE-2025-0426 GHSA-jgfp-53c3-624w
    • GO-2025-3764 CVE-2024-44905 GHSA-6xp3-p59p-q4fj
    • GO-2025-3829 CVE-2025-54410 GHSA-4vq8-7jfc-9cvp
    • GO-2025-4116 CVE-2025-47913
    • GO-2025-4122 CVE-2025-11777 GHSA-mqcj-8c2g-h97q
    • GO-2025-4178 CVE-2025-13870 GHSA-58w6-w55x-6wq8

  • Update to version 0.0.20251215T203741 2025-12-15T20:37:41Z (jsc#PED-11136).

    Go CVE Numbering Authority IDs added or updated with aliases:

    • GO-2025-4136 CVE-2025-64708 GHSA-ch7q-53v8-73pc
    • GO-2025-4137 CVE-2025-64521 GHSA-xr73-jq5p-ch8r
    • GO-2025-4148 CVE-2017-18874 GHSA-8qg8-c7mw-6fj7
    • GO-2025-4154 CVE-2025-62155 GHSA-9f46-w24h-69w4
    • GO-2025-4161 CVE-2025-65942 GHSA-66jq-2c23-2xh5
    • GO-2025-4162 CVE-2025-60633 GHSA-3j9f-7w24-pcqg
    • GO-2025-4167 CVE-2025-64715 GHSA-38pp-6gcp-rqvm
    • GO-2025-4168 CVE-2025-12419 GHSA-3x39-62h4-f8j6
    • GO-2025-4169 CVE-2025-12559 GHSA-4g87-9x45-cx2h
    • GO-2025-4170 CVE-2025-12421 GHSA-mp6x-97xj-9x62
    • GO-2025-4173 CVE-2025-10543 GHSA-32fw-gq77-f2f2
    • GO-2025-4188 CVE-2025-65637 GHSA-4f99-4q7p-p3gh
    • GO-2025-4191 CVE-2017-18878 GHSA-h564-6gc2-fcc6
    • GO-2025-4199 CVE-2017-18887 GHSA-35c4-5qfp-wxj6
    • GO-2025-4200 CVE-2017-18885 GHSA-g78f-6xq7-rrhq
    • GO-2025-4201 CVE-2017-18889 GHSA-jp57-4x34-5v94
    • GO-2025-4202 CVE-2017-18890 GHSA-m497-hq5x-6jcv
    • GO-2025-4203 CVE-2017-18888 GHSA-v2vm-hq26-5jv6
    • GO-2025-4204 CVE-2017-18886 GHSA-wvjg-33p9-938h
    • GO-2025-4205 CVE-2025-66491 GHSA-7vww-mvcr-x6vj
    • GO-2025-4206 CVE-2025-66490 GHSA-gm3x-23wp-hc2c
    • GO-2025-4207 CVE-2025-66508 GHSA-7cqv-qcq2-r765
    • GO-2025-4208 CVE-2025-66565 GHSA-m98w-cqp3-qcqr
    • GO-2025-4209 CVE-2025-66507 GHSA-qmg5-v42x-qqhq
    • GO-2025-4210 CVE-2025-67494 GHSA-7wfc-4796-gmg5
    • GO-2025-4211 GHSA-m6wq-66p2-c8pc
    • GO-2025-4212 GHSA-pfrf-9r5f-73f5
    • GO-2025-4213 CVE-2025-67495 GHSA-v959-qxv6-6f8p
    • GO-2025-4214 GHSA-4rmq-mc2c-r495
    • GO-2025-4215 CVE-2025-65796 GHSA-8jcj-g9f4-qx42
    • GO-2025-4216 CVE-2025-65798 GHSA-8p44-g572-557h
    • GO-2025-4217 CVE-2025-65795…
Record
SUSE-SU-2026:0037-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/traefik/traefik
Go
 through 1.7.34 None known
github.com/traefik/traefik/v2
Go
 before 2.11.32
2.11.32
github.com/traefik/traefik/v3
Go
 before 3.6.3
3.6.3
github.com/traefik/traefik
Go
 All versions None known
govulncheck-vulndb
openSUSE:Leap 15.6
From an advisory covering 76 CVEs
 before 0.0.20251230T014957-150000.1.134.1
0.0.20251230T014957-150000.1.134.1
traefik
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 3.6.6-1.1
3.6.6-1.1
traefik2
openSUSE:Tumbleweed
From an advisory covering 4 CVEs
 before 2.11.35-1.1
2.11.35-1.1
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-66490 is a medium vulnerability (CVSS 6.9) in Traefik, published December 8, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.44%, the 38th percentile. Fixed in github.com/traefik/traefik/v2 2.11.32.

References

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Left out here: 1,543 references and the rest of 2 source descriptions. The JSON record has them.

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