---
cve: "CVE-2026-28532"
severity: "MEDIUM"
cvss: 6.0
epss: "0.2%"
vendor: "FRRouting"
kev: false
exploited: false
published: "2026-04-30 21:16:31"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T10:57:33+02:00"
---

# CVE-2026-28532

> 6.0 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Benachbart | warn |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- cd39d029a48a1e58929a7f31e7d61a594c2ecb42 (Commit)
- f098decf02987fbf1c891766c1516ac832adadfd (Commit)

## Referenzen

- <https://github.com/FRRouting/frr/releases/tag/frr-10.5.3>
- <https://github.com/FRRouting/frr/pull/21002>
- <https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd>
- <https://www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functions>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-28532) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_