CVE Explorer
CVE-2026-7829
UltraVNC repeater through 1.8.2.2 contains a post-authentication out-of-bounds write in the allow/deny rule parser. In repeater/webgui/settings.c:225-272, after strncpy_s copies a rule token into temp1[rule1] (25-byte destination) or temp2/temp3 (16-byte destination), the code unconditionally writes a NUL terminator at temp1[rule1][len] = 0 without clamping len to the destination size. When an authenticated administrator saves a rule with a token length equal to or greater than the destination s
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","modules":["repeater"],"product":"UltraVNC","vendor":"uvnc","versions":[{"lessThanOrEqual":"1.8.2.2","status":"affected","version":"0","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:002cd7a890dba44d9bb04e73a6a5e7f6e62f955a8b4c11733b424e67617773ce · sha256:2ec68ca3e8f65202… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:002cd7a890dba44d9bb04e73a6a5e7f6e62f955a8b4c11733b424e67617773ce · sha256:2ec68ca3e8f65202… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-787","description":"Out-of-bounds Write","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:002cd7a890dba44d9bb04e73a6a5e7f6e62f955a8b4c11733b424e67617773ce · sha256:2ec68ca3e8f65202… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"name":"UltraVNC source repository","tags":["product"],"url":"https://github.com/ultravnc/UltraVNC"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:002cd7a890dba44d9bb04e73a6a5e7f6e62f955a8b4c11733b424e67617773ce · sha256:2ec68ca3e8f65202… · /containers/cna/references/1
{"name":"UltraVNC project page","tags":["vendor-advisory"],"url":"https://uvnc.com/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:002cd7a890dba44d9bb04e73a6a5e7f6e62f955a8b4c11733b424e67617773ce · sha256:2ec68ca3e8f65202… · /containers/cna/references/0
{"url":"https://www.securin.io/zero-days/cve-2026-7829-post-auth-oob-nul-write-repeater-rule-parser-ultravnc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:002cd7a890dba44d9bb04e73a6a5e7f6e62f955a8b4c11733b424e67617773ce · sha256:2ec68ca3e8f65202… · /containers/cna/references/2
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.