What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-30 · updated 2026-10-26
• Weakness: CWE-125

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.

Affected products

• FRRouting: before 10.5.3 — fixed in 10.5.3

How to fix

Upgrade to a fixed version: FRRouting 10.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd
• https://github.com/FRRouting/frr/pull/21002
• https://github.com/FRRouting/frr/releases/tag/frr-10.5.3
• https://www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functions

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