How severe is CVE-2026-28532?

CVE-2026-28532 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-28532 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28532?

CVE-2026-28532 affects Frrouting. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28532?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-28532 have an EU (EUVD) identifier?

Yes. CVE-2026-28532 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26418.

When was CVE-2026-28532 published?

CVE-2026-28532 was published on 2026-04-30 and last updated on 2026-06-17.

CVE-2026-28532

CVE-2026-28532 is a medium-severity vulnerability in Frrouting with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.0
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26418
Weakness: CWE-125
Affected product: Frrouting
Published: 2026-04-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-28532?: 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.
How severe is CVE-2026-28532?: CVE-2026-28532 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-28532 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28532?: CVE-2026-28532 affects Frrouting. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28532?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-28532 have an EU (EUVD) identifier?: Yes. CVE-2026-28532 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26418.
When was CVE-2026-28532 published?: CVE-2026-28532 was published on 2026-04-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:frrouting:frrouting:*:*:*:*:*:*:*:*

More vulnerabilities in Frrouting

CVE-2023-38406 — Critical (CVSS 9.8): bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow."
CVE-2023-41361 — Critical (CVSS 9.8): An issue was discovered in FRRouting FRR 9.0. bgpd/bgp_open.c does not check for an overly large length of the rcv…
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CVE-2022-37032 — Critical (CVSS 9.1): An out-of-bounds read in the BGP daemon of FRRouting FRR before 8.4 may lead to a segmentation fault and denial of…
CVE-2022-37035 — High (CVSS 8.1): An issue was discovered in bgpd in FRRouting (FRR) 8.3. In bgp_notify_send_with_data() and bgp_process_packet() in…

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