CVE-2026-28681
IRRD 4.x HTTP Host header abuse enables token theft and account takeover
Is CVE-2026-28681 being exploited?
Not confirmed. CVE-2026-28681 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-28681?
CVE-2026-28681 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-28681?
Yes. A fix has been recorded for CVE-2026-28681. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-28681 affect?
CVE-2026-28681 affects IRRD v4.4.0–4.4.4, IRRD v4.5.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-28681?
Patch to 4.4.5 or 4.5.1; enforce MFA for overrides
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Token theft via manipulated HTTP Host header during password reset/creation; attacker can take over IRRD accounts; 2FA for override users may block login.
Immediate action required
- affected>= 4.4.0 and < 4.4.5
- affected>= 4.5.0 and < 4.5.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.