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Vulnerability record · CVE-2026-71272 · published 5 August 2026

CVE-2026-71272: TOCTOU race condition vulnerability

Memos' webhook dispatch function safeDialContext (internal/webhook/webhook.go) resolves the target hostname via net.DefaultResolver.LookupHost and validates the resulting IPs against reserved ranges, but then dials net.JoinHostPort(host, port) using the original hostname rather than the already-validated IP address.

8.5 CVSS 3.1 High EPSS 0.26% · top 84.4% CWE-367 · TOCTOU race condition Deferred
8.5CVSS 3.1 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
26 Aug 2026Last modified by NVD

Description

Memos' webhook dispatch function safeDialContext (internal/webhook/webhook.go) resolves the target hostname via net.DefaultResolver.LookupHost and validates the resulting IPs against reserved ranges, but then dials net.JoinHostPort(host, port) using the original hostname rather than the already-validated IP address.

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

References

LinkTags
https://github.com/usememos/memos
https://github.com/usememos/memos/blob/main/internal/webhook/webhook.go

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-71272), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.