Path traversal in Koodo Reader OPDS handlers exposes server files
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.
Summary
Koodo Reader through 2.4.6 contains a path traversal flaw (CWE-22) in the OPDS handlers of its self-hosted HTTP server. An authenticated attacker can abuse the cover value in an uploaded database to read files outside the upload directory that the server process can access.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
Koodo Reader through 2.4.6 contains a path traversal vulnerability in the self-hosted HTTP server's OPDS handlers that allows authenticated attackers to read files outside the upload directory. Attackers can upload a crafted books.db with a cover value containing ../ sequences, then request /opds/cover/{key} to read files accessible to the server process.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| koodo-reader | koodo-reader | up to 2.4.6 | — | No fix listed | CNA |
- koodo-reader Vendorkoodo-reader Affected up to 2.4.6 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for koodo-reader.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-11-03 Threatist record created from CVE-2026-121544
- 2026-11-03 CISA SSVC decision points changed
- 2026-11-03 Alias added: GHSA-xh68-jpqj-pv76
References
Patch 1
Other 5
- GitHub Issue #1654
- https://github.com/koodo-reader/koodo-reader
- https://github.com/koodo-reader/koodo-reader/blob/v2.4.6/httpserver/opds.go#L167-L194
- https://github.com/koodo-reader/koodo-reader/blob/v2.4.6/httpserver/opds.go#L384-L431
- https://github.com/koodo-reader/koodo-reader/compare/205539043b0a2afd9fd8bf99ef8434bd1833c2bf...cbc79a1ab5cbbd61c8252d6ab3cc6dbb694663b8
More koodo-reader vulnerabilities
- TI-2026-39978 Koodo Reader: Remote code execution via malicious epub file CVSS 4.0HIGH 8.4
Sources
- CVE-2026-121544 · CVE Program
- CVE-2026-121544 · NVD
- FIRST EPSS
- GHSA-xh68-jpqj-pv76 · GitHub Advisory Database · CC BY 4.0
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