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Fencer Vulns
medium 6.5

CVE-2026-28532 json

FRRouting < 10.5.3 Integer Overflow in OSPF TLV Parser Functions

published 2026-04-30 6 mo ago modified 2026-11-08 17 h ago also EUVD-2026-26418

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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.

Patch / fix

  • FRRouting frr 10.5.3
  • frr Debian 12 8.4.4-1.1~deb12u2
  • frr Debian 13 10.3-3+deb13u1
  • frr Debian 14 10.5.3-1

debian advisories DEBIAN-CVE-2026-28532

  • frr Ubuntu 22.04 LTS 8.1-1ubuntu1.16
  • frr Ubuntu 24.04 LTS 8.4.4-1.1ubuntu6.7
  • frr Ubuntu 25.10 10.4.1-3ubuntu1.4
  • frr Ubuntu 26.04 LTS 10.5.1-1ubuntu4.1

ubuntu advisories UBUNTU-CVE-2026-28532

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • frr SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 7.4-150300.4.43.1
  • frr SLE Module for Server Applications 15 SP7 10.2.6-150700.3.10.1
  • frr SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +4 more 8.5.7-150500.4.43.1
  • frr SLES for SAP applications 16.0, SLES 16.0 10.2.6-160000.1.1
  • frr SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 8.5.7-8.16.1

suse advisories SUSE-SU-2026:2644-1SUSE-SU-2026:2457-1SUSE-SU-2026:2455-1SUSE-SU-2026:2454-1SUSE-SU-2026:22026-1

  • frr openSUSE Tumbleweed 10.6.1-1.1

opensuse advisories openSUSE-SU-2026:10721-1

  • frr Azure Linux 3.0 10.5.0-3

azure linux advisories AZL-85332

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-28532 updated cvss 6.5

FRRouting: frr: FRRouting: Denial of Service due to integer overflow in OSPF TLV parser functions

  • Red Hat Enterprise Linux 8 frr, frr-contrib, frr-selinux Red Hat Enterprise Linux 9 frr, frr10, frr-selinux, frr10-selinux Red Hat Enterprise Linux 10 frr
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.0 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
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 6.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • FRRouting frr

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.