CVE-2026-33812 - Vulnerability Details - OpenCVE

Parsing a malicious font file can cause excessive memory allocation.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

golang.org/x/image

golang.org/x/image/font/sfnt

unaffected

Version	Status	Constraints
`0`	affected	< 0.39.0

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://go.dev/cl/761180
https://go.dev/issue/78382
https://pkg.go.dev/vuln/GO-2026-4962

History

Wed, 22 Apr 2026 00:00:00 +0000

Type	Values Removed	Values Added
Description		Parsing a malicious font file can cause excessive memory allocation.
Title		Excessive memory allocation when decoding malicious SFNT in golang.org/x/image
References		https://go.dev/cl/761180 https://go.dev/issue/78382 https://pkg.go.dev/vuln/GO-2026-4962
Metrics		cvssV3_1 `{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: Go

Published: 2026-04-21T19:21:28.556Z

Updated: 2026-04-21T20:43:11.915Z

Reserved: 2026-03-23T20:35:32.814Z

Link: CVE-2026-33812

Vulnrichment

Updated: 2026-04-21T20:43:03.869Z

NVD

Status : Received

Published: 2026-04-21T20:16:56.290

Modified: 2026-04-21T21:16:29.843

Link: CVE-2026-33812

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

No weakness.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-33812", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-03-23T20:35:32.814Z", "datePublished": "2026-04-21T19:21:28.556Z", "dateUpdated": "2026-04-21T20:43:11.915Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-04-21T19:21:28.556Z"}, "title": "Excessive memory allocation when decoding malicious SFNT in golang.org/x/image", "descriptions": [{"lang": "en", "value": "Parsing a malicious font file can cause excessive memory allocation."}], "affected": [{"vendor": "golang.org/x/image", "product": "golang.org/x/image/font/sfnt", "collectionURL": "https://pkg.go.dev", "packageName": "golang.org/x/image/font/sfnt", "versions": [{"version": "0", "lessThan": "0.39.0", "status": "affected", "versionType": "semver"}], "programRoutines": [{"name": "source.view"}, {"name": "Collection.Font"}, {"name": "Font.GlyphAdvance"}, {"name": "Font.GlyphBounds"}, {"name": "Font.GlyphIndex"}, {"name": "Font.GlyphName"}, {"name": "Font.Kern"}, {"name": "Font.LoadGlyph"}, {"name": "Font.Name"}, {"name": "Font.WriteSourceTo"}, {"name": "Parse"}, {"name": "ParseCollection"}, {"name": "ParseCollectionReaderAt"}, {"name": "ParseReaderAt"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-789: Memory Allocation with Excessive Size Value"}]}], "references": [{"url": "https://go.dev/cl/761180"}, {"url": "https://go.dev/issue/78382"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4962"}], "credits": [{"lang": "en", "value": "Andy Gill, ZephrSec Ltd"}]}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-21T20:43:08.370574Z", "id": "CVE-2026-33812", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-21T20:43:11.915Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.1, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2026-33812", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-21T20:43:08.370574Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-21T20:43:03.869Z"}}], "cna": {"title": "Excessive memory allocation when decoding malicious SFNT in golang.org/x/image", "credits": [{"lang": "en", "value": "Andy Gill, ZephrSec Ltd"}], "affected": [{"vendor": "golang.org/x/image", "product": "golang.org/x/image/font/sfnt", "versions": [{"status": "affected", "version": "0", "lessThan": "0.39.0", "versionType": "semver"}], "packageName": "golang.org/x/image/font/sfnt", "collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "programRoutines": [{"name": "source.view"}, {"name": "Collection.Font"}, {"name": "Font.GlyphAdvance"}, {"name": "Font.GlyphBounds"}, {"name": "Font.GlyphIndex"}, {"name": "Font.GlyphName"}, {"name": "Font.Kern"}, {"name": "Font.LoadGlyph"}, {"name": "Font.Name"}, {"name": "Font.WriteSourceTo"}, {"name": "Parse"}, {"name": "ParseCollection"}, {"name": "ParseCollectionReaderAt"}, {"name": "ParseReaderAt"}]}], "references": [{"url": "https://go.dev/cl/761180"}, {"url": "https://go.dev/issue/78382"}, {"url": "https://pkg.go.dev/vuln/GO-2026-4962"}], "descriptions": [{"lang": "en", "value": "Parsing a malicious font file can cause excessive memory allocation."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-789: Memory Allocation with Excessive Size Value"}]}], "providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-04-21T19:21:28.556Z"}}}, "cveMetadata": {"cveId": "CVE-2026-33812", "state": "PUBLISHED", "dateUpdated": "2026-04-21T20:43:11.915Z", "dateReserved": "2026-03-23T20:35:32.814Z", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "datePublished": "2026-04-21T19:21:28.556Z", "assignerShortName": "Go"}, "dataVersion": "5.2"}