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PatchSiren cyber security CVE debrief

CVE-2026-110766 colanode CVE debrief

CVE-2026-110766 is a path traversal vulnerability in Colanode Server through version 0.4.7. Authenticated users can read arbitrary .jpeg files by manipulating the avatarId in the GET /client/v1/avatars/:avatarId route. This issue has a CVSS score of 5.3 and is considered medium severity. The vulnerability allows for potential unauthorized access to sensitive information. Defenders should prioritize verifying and patching Colanode Server instances, especially those exposed to authenticated users, to mitigate potential risks.

Vendor
colanode
Product
Unknown
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders responsible for Colanode Server instances, especially those exposed to authenticated users, should assess their exposure and prioritize patching. This includes reviewing system configurations, monitoring for suspicious activity, and implementing compensating controls where necessary. Additionally, defenders should consider conducting a thorough review of Colanode Server instances to identify potential exposure and track exceptions and retest rem

Why it matters

CVE-2026-110766 is a medium-severity path traversal vulnerability in Colanode Server through version 0.4.7. Authenticated users can manipulate the avatarId parameter to read arbitrary .jpeg files, potentially leading to unauthorized access to sensitive information. Defenders should prioritize verifying and patching Colanode Server instances, especially those exposed to authenticated users.

  • Potential unauthorized access to sensitive information
  • Possible data breaches due to arbitrary file reads
  • Need for verification and patching of Colanode Server instances

Technical summary

The Colanode Server through version 0.4.7 is vulnerable to a path traversal attack. An authenticated user can manipulate the avatarId parameter in the GET /client/v1/avatars/:avatarId route to read arbitrary .jpeg files. This could potentially lead to unauthorized access to sensitive information. The vulnerability has a CVSS score of 5.3 and is considered medium severity. Defenders should prioritize verifying and patching Colanode Server instances, especially those exposed to authenticated users, to mitigate potential risks.

Defensive priority

Defenders should prioritize verifying and patching Colanode Server instances, especially those exposed to authenticated users.

Recommended defensive actions

  • Verify and apply the latest patches for Colanode Server
  • Restrict access to the /client/v1/avatars/:avatarId route to only necessary users
  • Monitor for suspicious activity related to avatar downloads
  • Conduct a thorough review of Colanode Server instances to identify potential exposure
  • Implement compensating controls for exposed systems while remediation is scheduled and verified
  • Track exceptions and retest remediated assets to ensure vulnerability resolution
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability allows authenticated users to read arbitrary .jpeg files by supplying an encoded traversal sequence in avatarId. This could potentially lead to unauthorized access to sensitive information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-110766 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-110766

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-110766 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-110766

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Colanode Server through 0.4.7 Path Traversal via Avatar Download Route

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/110xxx/CVE-2026-110766.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://hackmd.io/@hieuPenguinnn/colanode-avatar-download-path-traversal

    Supplemental source - technical-description, exploit

  • Source reference

    Unverified legacy reference

    URL: https://github.com/colanode/colanode/blob/d649523637f0f059c936418488165d4a689da27c/apps/server/src/lib/storage/fs.ts

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://github.com/colanode/colanode/blob/d649523637f0f059c936418488165d4a689da27c/apps/server/src/api/client/routes/avatars/avatar-download.ts

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://github.com/colanode/colanode

    Supplemental source - product

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/colanode-server-through-0.4.7-path-traversal-via-avatar-download-route

    Supplemental source - third-party-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.