CVE Explorer

CVE-2026-44988

LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient's Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but it does not reject Tight rectangles whose width is larger than 2048 pixels. A malicious VNC server can send a crafted FramebufferUpdate rectangle using Tight encoding with NoZlib | ExplicitFilter and the Gradient filter. When a LibVNCClient-based client connects, the client processes the server-cont

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1860d406f6299d42092f7e618b85924e5285fc8e320194a9f1fe80ccbcb8ccb3

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"libvncserver","vendor":"LibVNC","versions":[{"status":"affected","version":"<= 0.9.15"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:19b6a3a487d2dcbd4f04be7b44247549f15146f2c2b529cf4ef7e78da3336d6e · sha256:e92a51551770aa0e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:19b6a3a487d2dcbd4f04be7b44247549f15146f2c2b529cf4ef7e78da3336d6e · sha256:e92a51551770aa0e… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:19b6a3a487d2dcbd4f04be7b44247549f15146f2c2b529cf4ef7e78da3336d6e · sha256:e92a51551770aa0e… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/LibVNC/libvncserver/commit/5b270544b85233668b98161323297d418a8f5fd1","tags":["x_refsource_MISC"],"url":"https://github.com/LibVNC/libvncserver/commit/5b270544b85233668b98161323297d418a8f5fd1"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:19b6a3a487d2dcbd4f04be7b44247549f15146f2c2b529cf4ef7e78da3336d6e · sha256:e92a51551770aa0e… · /containers/cna/references/1

{"name":"https://github.com/LibVNC/libvncserver/security/advisories/GHSA-jcc5-8wj4-7c58","tags":["x_refsource_CONFIRM"],"url":"https://github.com/LibVNC/libvncserver/security/advisories/GHSA-jcc5-8wj4-7c58"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:19b6a3a487d2dcbd4f04be7b44247549f15146f2c2b529cf4ef7e78da3336d6e · sha256:e92a51551770aa0e… · /containers/cna/references/0

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.

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