CVE-2026-28532: FRRouting before 10.5.3 contains an integer overflow vulnerability in seven OSPF Traffic Engineering and Segme

Q: How do I fix CVE-2026-28532?

frrouting: upgrade to 10.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-28532 being exploited?

CVE-2026-28532 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28532 affect?

CVE-2026-28532 affects frrouting. Severity is medium (CVSS 6.5). 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,

Q: How urgent is CVE-2026-28532?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-28532 is a medium-severity flaw (CVSS 6.5) affecting frrouting. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-125, CWE-190
Published	2026-04-30
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: frrouting

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-30 21:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

frrouting frrouting UPGRADE

Affected: < 10.5.3

Fixed in: 10.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy frrouting || rpm -q frrouting || frrouting --version

2. UPGRADE to 10.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade frrouting

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade frrouting

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28532?

frrouting: upgrade to 10.5.3. Exact commands for each OS are on this page.

Is CVE-2026-28532 being exploited?

CVE-2026-28532 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28532 affect?

CVE-2026-28532 affects frrouting. Severity is medium (CVSS 6.5). 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,

How urgent is CVE-2026-28532?

Priority 26/100. No elevated risk signals yet.

References

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