CVE-2026-115411

MEDIUM 5.0

crawlseo before 0.2.4 Server-Side Request Forgery via Crawler

CVSS Score

5.0

EPSS Score

0.0%

EPSS Percentile

0th

crawlseo before version 0.2.4 contains a server-side request forgery vulnerability in its crawler engine where isPrivateIp() fails to block reserved IP ranges such as RFC 6598 Carrier-Grade NAT, RFC 6890, TEST-NET ranges and certain IPv6 addresses, and additionally fails to pin the validated address for the actual outbound connection, allowing a TOCTOU DNS rebinding bypass. An authenticated attacker can add a malicious domain that resolves to an internal or restricted address, trigger a crawl to reach internal services or cloud metadata endpoints like 169.254.169.254, and retrieve the fetched page's title, description, headings, status code and links through the crawl results API, enabling internal network reconnaissance.

CWE	CWE-918
Vendor	crawlseo
Product	crawlseo
Published	Oct 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

crawlseo / crawlseo

0.1.0 < 0.2.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/crawlseo/crawlseo/commit/76e4e693de0c6b294cf1f60656800e47346f1c28 github.com: https://github.com/crawlseo/crawlseo/releases?page=1#release-v0.2.4 gist.github.com: https://gist.github.com/mansurmavlankulov/47cb8e183fec39a7afe599d1082a3399 vulncheck.com: https://www.vulncheck.com/advisories/crawlseo-before-server-side-request-forgery-via-crawler

Credits

Mansurzhan Mavlankulov