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.

CVSS 4.0

6.0CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-26)

CWEs

CWE-125, CWE-190

Published

2026-04-30

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• frrouting:frrouting

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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