CVE-2026-28532
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-28532.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-28532
Vendor advisory: disclosure@vulncheck.com — https://github.com/FRRouting/frr/releases/tag/frr-10.5.3
Vendor advisory: disclosure@vulncheck.com — https://github.com/FRRouting/frr/pull/21002
Vendor advisory: disclosure@vulncheck.com — https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | bullseye | affected | |
| debian | forky | fixed | 10.5.3-1 |
| debian | sid | fixed | 10.5.3-1 |
| debian | trixie | affected | |
| sles | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| frrouting | frrouting | {"endExcluding":"10.5.3"} | 10.5.3 |
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
- https://security-tracker.debian.org/tracker/CVE-2026-28532
- https://www.suse.com/security/cve/CVE-2026-28532.html
CWEs
CWE-125 CWE-190
Verify integrity in audit chain (admin only). AS-IS.