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CVE-2026-71850: Hono: `memo()` retains SSR output across requests, leading to cross-user data disclosure

August 7, 2026

memo() from hono/jsx retains the result of a server-side render and reuses it for later renders with comparator-equal props. Request-scoped values read inside the component take no part in that comparison, so a response can contain HTML rendered for another user’s request.

References

  • github.com/advisories/GHSA-f23p-vx2j-j53r
  • github.com/honojs/hono/commit/0c45036d6b0ddf42ab2fa44639dc8710825d5c0f
  • github.com/honojs/hono/releases/tag/v4.12.34
  • github.com/honojs/hono/security/advisories/GHSA-f23p-vx2j-j53r
  • nvd.nist.gov/vuln/detail/CVE-2026-71850

Code Behaviors & Features

Detect and mitigate CVE-2026-71850 with GitLab Dependency Scanning

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Affected versions

All versions starting from 3.8.0 before 4.12.34

Fixed versions

  • 4.12.34

Solution

Upgrade to version 4.12.34 or above.

Impact 4.8 MEDIUM

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

Learn more about CVSS

Weakness

  • CWE-488: Exposure of Data Element to Wrong Session

Source file

npm/hono/CVE-2026-71850.yml

Spotted a mistake? Edit the file on GitLab.

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