Is CVE-2026-28532 in the CISA KEV catalog?

No. CVE-2026-28532 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-28532?

CVE-2026-28532 has a CVSS v3 base score of 6.5 (Moderate).

What is the EPSS score for CVE-2026-28532?

CVE-2026-28532 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-28532?

Upgrade frr on debian 12 to 8.4.4-1.1~deb12u2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-28532

MEDIUM

6.5

CVSS v3

NVD

Description

FRRouting before 10.5.3 contains an integer overflow vulnerability in seven OSPF Traffic Engineering and Segment Routing TLV parser functions where a uint16_t accumulator variable truncates uint32_t values returned by the TLV_SIZE() macro, causing the loop termination condition to fail while pointer advancement continues unchecked. Attackers with an established OSPF adjacency can send a crafted LS Update packet with a malicious Type 10 or Type 11 Opaque LSA to trigger out-of-bounds memory reads and crash all affected routers in the OSPF area or autonomous system.

CWE-125Out-of-bounds Read CWE-190Integer Overflow

How to fix

Remediation Available

frrDebian

Fixed in:8.4.4-1.1~deb12u2CVE-2026-28532

Fixed in:10.3-3+deb13u1CVE-2026-28532

Fixed in:10.5.3-1CVE-2026-28532

frrUbuntu

Fixed in:8.1-1ubuntu1.16USN-8376-1

Fixed in:8.4.4-1.1ubuntu6.7USN-8376-1

Fixed in:10.4.1-3ubuntu1.4USN-8376-1

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 VectorAdjacent

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Patch2

Third-Party Advisory1

vulncheck.com

Release Notes1

github.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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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 2026-05-01.