Medium [CVE-2026-82398] Denial of Service via inefficient handling of non-whitespace inputs
This medium-severity Red Hat Linux advisory covers CVE-2026-82398 affecting Exploit Intelligence, Lightspeed Core, OpenShift Lightspeed.
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Summary
A flaw was found in pypdf. An attacker can craft a PDF that causes long runtimes when the `read_until_whitespace` function processes a stream containing a long sequence of bytes without whitespace.
This occurs due to inefficient algorithmic complexity, where the function repeatedly performs immutable bytes concatenation in a one-byte loop. This leads to quadratic processing cost and a potential Denial of Service (DoS).
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-1046.
Affected Red Hat products: Exploit Intelligence; Lightspeed Core; OpenShift Lightspeed; Red Hat Ansible Automation Platform 2; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI); Red Hat Quay 3. Will not fix / out of support: Exploit Intelligence; Red Hat Ansible Automation Platform 2; Red Hat Quay 3.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: 6.15.0. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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