Critical [CVE-2026-110264] integer overflow issue in regular expression compiler
This critical-severity Red Hat Linux advisory covers CVE-2026-110264; related products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
integer overflow issue in regular expression compiler. Red Hat rates this critical (CVSS 9.8).
Weakness: CWE-190. Red Hat lists fixing advisory RHSA-2026:88861 with package ruby3-3-main-3.3.13-23.8.hum1, ruby3-4-main-3.4.12-33.1.hum1, ruby4-0-main-4.0.9-41.hum1.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 4 more.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4; Red Hat Satellite 6; Red Hat package: ruby4.0.
- < 7.0
- < 18.11.13
- < 19.0
- < 19.0.10
- < 19.1
- < 19.1.9
- < 19.2
- < 19.2.9
- < 19.3
- < 19.3.6
- < 19.4
- < 19.4.3
- < 19.5
- < 19.5.1
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- ruby3-3-main-3.3.13-23.8.hum1
- ruby3-4-main-3.4.12-33.1.hum1
- ruby4-0-main-4.0.9-41.hum1
- RHSA-2026:88861
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, do not compile regular expressions from untrusted sources. Standard safeguards such as Regexp.timeout or limiting the length of the input pattern do not protect against this issue.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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