CVE-2026-28532

Summary

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.

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd ↗

Additional information

• NVD record
• https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfdPatch
• https://github.com/FRRouting/frr/pull/21002Patch
• https://github.com/FRRouting/frr/releases/tag/frr-10.5.3
• https://www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functionsAdvisory