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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.

PUBLISHED Reserved 2026-02-27 | Published 2026-04-30 | Updated 2026-05-01 | Assigner VulnCheck




MEDIUM: 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

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

Problem types

CWE-190: Integer Overflow or Wraparound

CWE-125: Out-of-bounds Read

Product status

Default status
affected

Any version
affected

Credits

Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. finder

VulnCheck finder

References

github.com/FRRouting/frr/releases/tag/frr-10.5.3 release-notes

github.com/FRRouting/frr/pull/21002 issue-tracking

github.com/...ommit/f098decf02987fbf1c891766c1516ac832adadfd patch

www.vulncheck.com/...r-overflow-in-ospf-tlv-parser-functions third-party-advisory

cve.org (CVE-2026-28532)

nvd.nist.gov (CVE-2026-28532)

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