High 7.3Published Feb 7, 2024

CVE-2024-24806libuv is a multi-platform support library with a focus on asynchronous I/O.

Updated under an hour ago (Nov 2, 2026, 1:40 AM ET)

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libuv is a multi-platform support library with a focus on asynchronous I/O. The `uv_getaddrinfo` function in `src/unix/getaddrinfo.c` (and its windows counterpart `src/win/getaddrinfo.c`), truncates hostnames to 256 characters before calling `getaddrinfo`. This behavior can be exploited to create addresses like `0x00007f000001`, which are considered valid by `getaddrinfo` and could allow an attacker to craft payloads that resolve to unintended IP addresses, bypassing developer checks. The vulnerability arises due to how the `hostname_ascii` variable (with a length of 256 bytes) is handled in `uv_getaddrinfo` and subsequently in `uv__idna_toascii`. When the hostname exceeds 256 characters, it gets truncated without a terminating null byte. As a result attackers may be able to access internal APIs or for websites (similar to MySpace) that allows users to have `username.example.com` pages. Internal services that crawl or cache these user pages can be exposed to SSRF attacks if a malicious user chooses a long vulnerable username. This issue has been addressed in release version 1.48.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS: 7.3 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

libuv libuv libuv:libuv	from 1.24.0 before 1.48.0	NVD

References

References

http://www.openwall.com/lists/oss-security/2024/02/08/2	mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2024/02/11/1	mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2024/03/11/1
https://github.com/libuv/libuv/commit/0f2d7e784a256b54b2385043438848047bc2a629	patch
https://github.com/libuv/libuv/commit/3530bcc30350d4a6ccf35d2f7b33e23292b9de70	patch
https://github.com/libuv/libuv/commit/c858a147643de38a09dd4164758ae5b685f2b488	patch
https://github.com/libuv/libuv/commit/e0327e1d508b8207c9150b6e582f0adf26213c39	patch
https://github.com/libuv/libuv/security/advisories/GHSA-f74f-cvh7-c6q6	exploit, vendor-advisory
https://gitlab.kitware.com/cmake/cmake/-/issues/26112
https://lists.debian.org/debian-lts-announce/2024/03/msg00005.html
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The CVE record on cve.org NVD's entry

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