SB2026092241 - Multiple vulnerabilities in IBM Optim
Published: September 22, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Resource exhaustion (CVE-ID: CVE-2026-1519)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the DNSSEC validation component when handling NSEC3 records during insecure delegation validation. A remote attacker can send a specially crafted DNS zone response to cause excessive CPU load on the resolver.
Resolvers performing DNSSEC validation are affected; authoritative-only servers are generally not affected unless they perform recursive queries.
2) Missing release of memory after effective lifetime (CVE-ID: CVE-2026-3104)
CWE-ID: CWE-401 - Missing release of memory after effective lifetime
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper memory management in the DNSSEC proof preparation component when handling recursive queries for a specially crafted domain. A remote attacker can send a specially crafted domain query to cause unbounded memory consumption, leading to an out-of-memory condition and potential service termination during shutdown or reload.
Resolvers are affected; authoritative servers may be at risk if they perform recursive queries.
Remediation
Install update from vendor's website.