Medium [CVE-2026-87859] Log Injection via unescaped double quote in log fields
This medium-severity Red Hat Linux advisory covers CVE-2026-87859 affecting Cryostat 4, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in morgan, an HTTP request logger middleware for Node.js. An unauthenticated remote attacker can exploit this vulnerability by injecting an unescaped double quote into a log field they control, such as the User-Agent or Referer header.
This causes the log field to close prematurely, leading a log parsing system to misinterpret subsequent attacker-controlled text as a different log field. This could result in the forging of log entries, potentially impacting the integrity of log data.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-117.
Affected Red Hat products: Cryostat 4; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Fuse 7; Red Hat Hardened Images; Red Hat Openshift Data Foundation 4. Red Hat lists Red Hat Hardened Images as not affected.
Will not fix / out of support: Red Hat Fuse 7; Red Hat Hardened Images. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: linux-sgx; Red Hat package: nodejs22; Red Hat package: nodejs24; Red Hat package: nodejs26.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 41 minutes ago·verify at source
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