CVE-2026-28532 FRRouting < 10.5.3 Integer Overflow in OSPF TLV Parser Functions

What is CVE-2026-28532?

CVE-2026-28532 is a medium-severity vulnerability in FRRouting frr, published on 30 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-190, CWE-125

Which versions are affected by CVE-2026-28532?

It affects 1 product.

Products include Frrouting Frrouting.

How do I fix CVE-2026-28532?

Upgrade to a fixed version.

Is CVE-2026-28532 being exploited?

There is no known exploitation of CVE-2026-28532 in the wild and no public exploit code.

Other vulnerabilities in FRRouting frr

• CVE-2024-44070 Denial of service in n/a Critical 9.8
• CVE-2023-38406 bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow." Critical 9.8
• CVE-2022-37035 Use after free in n/a High 8.1
• CVE-2022-26127 Memory corruption in FRRouting High 7.8
• CVE-2022-26128 Memory corruption in FRRouting High 7.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-85332, DEBIAN-CVE-2026-28532, GHSA-wjc3-2qjv-c8fp, UBUNTU-CVE-2026-28532.