165 lines
6.7 KiB
JSON
165 lines
6.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-44042",
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"assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
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"state": "PUBLISHED",
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"assignerShortName": "securin",
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"dateReserved": "2026-05-05T03:40:37.003Z",
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"datePublished": "2026-07-01T03:33:07.511Z",
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"dateUpdated": "2026-07-09T04:36:12.685Z"
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},
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"containers": {
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"cna": {
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"title": "UltraVNC repeater wi_uudecode off-by-one in base64 decode boundary check",
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"descriptions": [
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{
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"lang": "en",
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"value": "UltraVNC repeater through 1.8.2.2 contains an off-by-one error in the Base64 decode helper used for HTTP Basic authentication. In repeater/webgui/webutils.c:817, the wi_uudecode() function checks whether the input length exceeds the output buffer with a strict greater-than comparison (>), while the correct check should be greater-than-or-equal (>=). When strlen(authdata) equals sizeof(decode), the decoded output length (approximately 3/4 of input) does not overflow the buffer in current practice because the outer HTTP request bounds constrain the Authorization header. However, the defective check leaves a latent off-by-one condition that could become exploitable if the buffering constraints change. The current risk is limited to a one-byte write at the boundary of a 1024-byte stack buffer under constrained conditions."
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}
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],
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"affected": [
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{
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"vendor": "uvnc",
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"product": "UltraVNC",
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"versions": [
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{
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"version": "0",
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"lessThanOrEqual": "1.8.2.2",
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"status": "affected",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unaffected",
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"modules": [
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"repeater"
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"type": "CWE",
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"cweId": "CWE-193",
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"lang": "en",
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"description": "Off-by-one Error"
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}
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]
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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],
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
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"attackVector": "NETWORK",
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"attackComplexity": "HIGH",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "LOW",
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"baseScore": 3.7,
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"baseSeverity": "LOW"
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}
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}
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],
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"references": [
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{
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"url": "https://uvnc.com/",
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"name": "UltraVNC project page",
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"tags": [
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"vendor-advisory"
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]
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},
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{
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"url": "https://github.com/ultravnc/UltraVNC",
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"name": "UltraVNC source repository",
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"tags": [
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"product"
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]
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},
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{
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"url": "https://www.securin.io/zero-days/cve-2026-44042-wi-uudecode-off-by-one-bounded-ultravnc-repeater"
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}
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],
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"timeline": [
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{
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"time": "2026-06-02T00:00:00.000Z",
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"lang": "en",
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"value": "Vulnerability discovered during security audit"
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},
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{
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"time": "2026-06-17T00:00:00.000Z",
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"lang": "en",
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"value": "Reported to vendor (coordinated disclosure)"
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},
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{
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"time": "2026-09-15T00:00:00.000Z",
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"lang": "en",
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"value": "Planned public disclosure (90-day window)"
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "Arjun Basnet, Securin (arjun.basnet@securin.io)",
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"type": "finder"
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}
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],
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"source": {
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"discovery": "EXTERNAL",
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"advisory": "Securin Security Advisory — FINDING-008"
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},
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"providerMetadata": {
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"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c",
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"shortName": "securin",
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"dateUpdated": "2026-07-09T04:36:12.685Z"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-07-01T13:08:54.695763Z",
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"id": "CVE-2026-44042",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-07-01T13:09:24.760Z"
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}
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}
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]
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}
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} |