No exploitation reportedFix available

CVE-2023-26021

Q: Is CVE-2023-26021 actively exploited?

Active exploitation of CVE-2023-26021 has not been confirmed. Its EPSS score was 1.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-26021?

CVE-2023-26021 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2023-04-28
Fixed in11.5.8 · 11.1.4
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1 and 11.5 is vulnerable to a denial of service as the server may crash when compiling a specially crafted SQL query using a LIMIT clause. IBM X-Force ID: 247864.

Timeline

dates in UTC

2023-04-2819:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-26021?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-26021?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ibm db2version to verify

Branch	Affected	Fixed in	Source
11.5	≥ 11.5, < 11.5.8	11.5.8	NVD
11.1	≥ 11.1, < 11.1.4	11.1.4	NVD
11.1	= 11.1.4	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Ibm db2 to 11.5.8 · 11.1.4

Advisories and patches

exchange.xforce.ibmcloud.comVendor Advisory
www.ibm.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-01-30
OpenCVESSVC decisionnone—
CNACVSS 3.17.5read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
CNAweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score1.0 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2023-04-28
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-26021?

Is CVE-2023-26021 actively exploited?

Active exploitation of CVE-2023-26021 has not been confirmed. Its EPSS score was 1.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-26021?

CVE-2023-26021 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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