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Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

CVE-2026-28681IRRd: web UI host header injection allows password reset poisoning via attacker-controlled email links

High 8.1

In plain English

A high-severity open redirect in irrd from irrdnet. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.5%top 57.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Internet Routing Registry daemon version 4 is an IRR database server, processing IRR objects in the RPSL format. From version 4.4.0 to before version 4.4.5 and from version 4.5.0 to before version 4.5.1, an attacker can manipulate the HTTP Host header on a password reset or account creation request. The confirmation link in the resulting email can then point to an attacker-controlled domain. Opening the link in the email is sufficient to pass the token to the attacker, who can then use it on the real IRRD instance to take over the account. A compromised account can then be used to modify RPSL objects maintained by the account's mntners and perform other account actions. If the user had two-factor authentication configured, which is required for users with override access, an attacker is not able to log in, even after successfully resetting the password. This issue has been patched in versions 4.4.5 and 4.5.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIirrd4.4.5GHSA-22m3-c7vp-49fj
PyPIirrd4.5.1GHSA-22m3-c7vp-49fj
PyPIirrd4.4.5, 4.5.1PYSEC-2026-2186

Affected products (as reported)

VendorProductVersions
irrdnet irrd >= 4.4.0, < 4.4.5>= 4.5.0, < 4.5.1

Weakness: CWE-601, CWE-640 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References