PatchTheCVECVE-2026-39376: FastFeedParser is a high performance RSS, Atom and RDF parser
CVE-2026-39376 is a high-severity flaw (CVSS 7.5) affecting fastfeedparser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
FastFeedParser is a high performance RSS, Atom and RDF parser. Prior to 0.5.10, when parse() fetches a URL that returns an HTML page containing a <meta http-equiv="refresh"> tag, it recursively calls itself with the redirect URL — with no depth limit, no visited-URL deduplication, and no redirect count cap. An attacker-controlled server that returns an infinite chain of HTML meta-refresh responses causes unbounded recursion, exhausting the Python
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 74%) |
| CISA exploited list | No |
| Weakness | CWE-674 |
| Published | 2026-04-07 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-39376?
fastfeedparser: upgrade to 0.5.10. Exact commands for each OS are on this page.
Is CVE-2026-39376 being exploited?
CVE-2026-39376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-39376 affect?
CVE-2026-39376 affects fastfeedparser. Severity is high (CVSS 7.5). FastFeedParser is a high performance RSS, Atom and RDF parser. Prior to 0.5.10, when parse() fetches a URL that returns an HTML page containing a <meta http-equiv="refresh"> tag, it recursively calls itself with the redirect URL — with no d
How urgent is CVE-2026-39376?
Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action