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.

CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0002

Probability of exploitation

0.05%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

CWE-190 Integer Overflow

Affected Products

Vendor	Product	Versions
frrouting	frrouting	< 10.5.3

References

Advisories & Patches

https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd https://github.com/FRRouting/frr/pull/21002

Other References

https://github.com/FRRouting/frr/releases/tag/frr-10.5.3 https://www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functions

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-28532? +

CVE-2026-28532 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0002, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-28532? +

CVE-2026-28532 affects products from frrouting, specifically: frrouting. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-28532? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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