Is CVE-2026-45186 in the CISA KEV catalog?

No. CVE-2026-45186 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-45186?

CVE-2026-45186 has a CVSS v3 base score of 2.9 (Low).

What is the EPSS score for CVE-2026-45186?

CVE-2026-45186 has an EPSS score of 0.43% (34th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-45186?

Upgrade expat on debian unstable to 2.8.0-2 or later. Fixes are available for 19 affected products.

CVE & CISA-KEV Catalog

CVE-2026-45186

LOW

2.9

CVSS v3

NVD

Description

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

CWE-407

How to fix

Remediation Available

expatDebian

Fixed in:2.8.0-2CVE-2026-45186

expatRed Hat / RHEL

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

expatRocky

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

expat-debuginfoRocky

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

expat-debuginfoRed Hat / RHEL

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

expat-debugsourceRed Hat / RHEL

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

expat-debugsourceRocky

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

expat-develRocky

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

expat-develRed Hat / RHEL

Fixed in:0:2.7.3-1.el10_2.1RHSA-2026:22715

Fixed in:0:2.5.0-2.el8_10RHSA-2026:22721

Fixed in:0:2.5.0-6.el9_8.1RHSA-2026:23230

registry.redhat.io/discovery/discoveryRed Hat / RHEL

Fixed in:server-rhel9@sha256:6a26bc89c61e7fad594399ceda8e170d66fa241d818eada7a12d9fec6bb08ecc_amd64RHSA-2026:29197

Fixed in:ui-rhel9@sha256:335f5d49155804969d193c3104fd144d7e499e2d5433965b217f379cbcf1cc75_arm64RHSA-2026:29197

Fixed in:server-rhel9@sha256:ccd969d2710875e82896556e7b3c02e39147d03612452af6b0a916b656ce5b34_arm64RHSA-2026:29197

Fixed in:ui-rhel9@sha256:16b33ed961e598805d155db8fea7bb293fb8ef95ddd45169c61fbeb5a8944b6b_amd64RHSA-2026:29197

registry.redhat.io/discovery/discoveryRocky

Fixed in:ui-rhel9@sha256:335f5d49155804969d193c3104fd144d7e499e2d5433965b217f379cbcf1cc75_arm64RHSA-2026:29197

Fixed in:server-rhel9@sha256:ccd969d2710875e82896556e7b3c02e39147d03612452af6b0a916b656ce5b34_arm64RHSA-2026:29197

Fixed in:ui-rhel9@sha256:16b33ed961e598805d155db8fea7bb293fb8ef95ddd45169c61fbeb5a8944b6b_amd64RHSA-2026:29197

Fixed in:server-rhel9@sha256:6a26bc89c61e7fad594399ceda8e170d66fa241d818eada7a12d9fec6bb08ecc_amd64RHSA-2026:29197

registry.redhat.io/rhui5/cdsRocky

Fixed in:rhel9@sha256:5c18f8336186fb1c9dbc1e710e91420ca3f5eca92b081cace3325585789f4825_amd64RHSA-2026:26319

Fixed in:kubernetes-rhel9@sha256:2958104c085c46561c9453784a06a36ab12a27e21ba1e732b4b30a092bb58805_amd64RHSA-2026:26319

registry.redhat.io/rhui5/cdsRed Hat / RHEL

Fixed in:kubernetes-rhel9@sha256:2958104c085c46561c9453784a06a36ab12a27e21ba1e732b4b30a092bb58805_amd64RHSA-2026:26319

Fixed in:rhel9@sha256:5c18f8336186fb1c9dbc1e710e91420ca3f5eca92b081cace3325585789f4825_amd64RHSA-2026:26319

registry.redhat.io/rhui5/haproxyRed Hat / RHEL

Fixed in:rhel9@sha256:66ccfb245bd6461e49aa0c84742710b557b9924baaef38e02904c6fd2f8db0c5_amd64RHSA-2026:26319

registry.redhat.io/rhui5/haproxyRocky

Fixed in:rhel9@sha256:66ccfb245bd6461e49aa0c84742710b557b9924baaef38e02904c6fd2f8db0c5_amd64RHSA-2026:26319

registry.redhat.io/rhui5/installerRed Hat / RHEL

Fixed in:rhel9@sha256:4b793b24511377dd18beae2f85792e8b2af0c615837155137a62f65e171ca0d7_amd64RHSA-2026:26319

registry.redhat.io/rhui5/installerRocky

Fixed in:rhel9@sha256:4b793b24511377dd18beae2f85792e8b2af0c615837155137a62f65e171ca0d7_amd64RHSA-2026:26319

registry.redhat.io/rhui5/rhuaRocky

Fixed in:rhel9@sha256:a79dde325d7229002a36a0a8ad75ae8c25e96004a9e5f0b90c51fc335460dccf_amd64RHSA-2026:26319

registry.redhat.io/rhui5/rhuaRed Hat / RHEL

Fixed in:rhel9@sha256:a79dde325d7229002a36a0a8ad75ae8c25e96004a9e5f0b90c51fc335460dccf_amd64RHSA-2026:26319

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.43%probability of exploitation in 30 days

34thpercentile

Low risk: more likely to be exploited than 34% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

openwall.com

Other references9

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-30.