Vulnerability in Kagisearch Fastfeedparser
CVE-2026-39376
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…
EPSS: 0.001 (23.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Kagisearch Fastfeedparser — versions < 0.5.10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/kagisearch/fastfeedparser/security/advisories/GHSA-4gx2-pc4f-wq37 (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-39376?
- CVE-2026-39376 is a high-severity vulnerability in Kagisearch Fastfeedparser, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-04-07.
- How severe is CVE-2026-39376?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-39376 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.