Out-of-bounds Read in Frrouting Frr
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Frrouting Frr — versions 0
- Frrouting
Weakness classification (CWE)
References
- github.com/FRRouting/frr/releases/tag/frr-10.5.3 (release-notes, Release Notes)
- github.com/FRRouting/frr/pull/21002 (issue-tracking, Patch, Issue Tracking)
- github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd (Patch, patch)
- www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-func… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-28532?
- CVE-2026-28532 is a medium-severity vulnerability in Frrouting Frr, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-04-30.
- How severe is CVE-2026-28532?
- Medium severity. CVSS v3 base score is 6.5 out of 10.