EUVD-2026-38390Published

MessagePack-CSharp: LZ4 decompression may fail with AccessViolationException after dereferencing memory from bad input

cve-program · CVE-2026-48109

Published

MessagePack-CSharp

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "MessagePack-CSharp",
                    "product": "MessagePack-CSharp",
                    "versions": [
                        {
                            "version": ">= 3.1.7, < 3.1.7",
                            "status": "affected"
                        },
                        {
                            "version": "< 2.5.301",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-38390

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jun 22, 2026, 9:19:54 PM

dateUpdated: Jun 23, 2026, 12:14:29 PM

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-48109

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-20

Original publisher date fields

published: 2026-06-22T22:16:46.617

lastModified: 2026-06-23T17:25:43.420

1 source CPE criteria · context only

cpe:2.3:a:messagepack:messagepack:*:*:*:*:*:c\#:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-hv8m-jj95-wg3x

Published

MessagePack

NuGet

ECOSYSTEM · introduced 0 → fixed 2.5.301

120 versions listed as affected

0.1.0-beta, 0.2.0-beta, 0.2.1-beta, 0.2.2-beta, 0.2.3-beta, 0.3.0-beta, 0.4.0, 0.4.1, 0.4.2, 0.5.0, 0.6.0, 0.6.1, 0.7.0, 0.7.2, 0.8.0, 0.8.1, 0.8.2, 0.8.3, 0.8.4, 0.8.5, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.1.0, 1.1.1, 1.1.1.1, 1.1.2, 1.2.0, 1.2.0.1, 1.2.0.2, 1.2.1, 1.2.2, 1.2.3, 1.3.0, 1.3.1, 1.3.1.1, 1.3.2, 1.3.3, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.4.4, 1.5.0, 1.5.0.1, 1.5.0.2, 1.5.1, 1.6.0, 1.6.0.1, 1.6.0.2, 1.6.0.3, 1.6.1, 1.6.1.1, 1.6.1.2, 1.6.2, 1.7.0, 1.7.1, 1.7.2, 1.7.3, 1.7.3.1, 1.7.3.2, 1.7.3.3, 1.7.3.4, 1.7.3.7, 1.8.71-beta, 1.8.74, 1.8.80, 1.9.11, 1.9.3, 1.9.3-g129239b107, 2.0.107-alpha, 2.0.108-alpha, 2.0.110-alpha, 2.0.110-alpha-g1e44a9106f, 2.0.119-beta, 2.0.123-beta, 2.0.171-beta, 2.0.204-beta, 2.0.221-beta, 2.0.231-rc, 2.0.270-rc, 2.0.299-rc, 2.0.323, 2.0.335, 2.1.115, 2.1.143, 2.1.152, 2.1.165, 2.1.194, 2.1.80, 2.1.90, 2.2.113, 2.2.36-alpha, 2.2.44-rc, 2.2.60, 2.2.85, 2.3.112, 2.3.58-alpha, 2.3.73-alpha, 2.3.75, 2.3.85, 2.4.14-alpha, 2.4.23-alpha, 2.4.35, 2.4.59, 2.5.103, 2.5.108, 2.5.124, 2.5.129, 2.5.140, 2.5.168, 2.5.171, 2.5.172, 2.5.187, 2.5.192, 2.5.198, 2.5.205, 2.5.64-alpha, 2.5.94

MessagePack

NuGet

ECOSYSTEM · introduced 3.0.214-rc.1 → fixed 3.1.7

9 versions listed as affected

3.0.300, 3.0.308, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5, 3.1.6

Original source record · Cite this exact observation · Complete original publisher JSON