How severe is CVE-2026-23918?

CVE-2026-23918 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-23918 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 46% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23918?

CVE-2026-23918 affects Apache Http Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23918?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-23918 have an EU (EUVD) identifier?

Yes. CVE-2026-23918 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26955.

When was CVE-2026-23918 published?

CVE-2026-23918 was published on 2026-05-04 and last updated on 2026-06-30.

CVE-2026-23918

CVE-2026-23918 is a high-severity vulnerability in Apache Http Server with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 46% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-415.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 46% (99th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26955
Weakness: CWE-415
Affected product: Apache Http Server
Published: 2026-05-04
Last modified: 2026-06-30

Description

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Frequently asked questions

What is CVE-2026-23918?: Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.
How severe is CVE-2026-23918?: CVE-2026-23918 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-23918 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 46% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23918?: CVE-2026-23918 affects Apache Http Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23918?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23918 have an EU (EUVD) identifier?: Yes. CVE-2026-23918 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26955.
When was CVE-2026-23918 published?: CVE-2026-23918 was published on 2026-05-04 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:apache:http_server:2.4.66:*:*:*:*:*:*:*

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All CVEs affecting Apache Http Server →

Other CWE-415 (Double Free) vulnerabilities

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CVE-2020-37239 — Critical (CVSS 9.8): libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety…
CVE-2026-43011 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When…
CVE-2026-31609 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid double-free in…
CVE-2026-31608 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in…

Browse all CWE-415 (Double Free) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

50.6.248.168 (ipv4-addr)
50.35.168.148 (ipv4-addr)
87.106.47.28 (ipv4-addr)
82.64.209.249 (ipv4-addr)
103.163.117.83 (ipv4-addr)
187.17.228.218 (ipv4-addr)