CVE-2026-55967 - Vulnerability Details - OpenCVE

AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.

Attack Vector Local

Attack Complexity High

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

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

No data.

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors	Products

References

Link	Providers
https://github.com/wolfSSL/wolfssl/pull/10709
https://www.wolfssl.com/docs/security-vulnerabilities/

History

Thu, 25 Jun 2026 18:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Thu, 25 Jun 2026 17:30:00 +0000

Type	Values Removed	Values Added
Description		AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.
Title		AES-GCM streaming APIs do not reject >64 GiB cumulative single messages, enabling counter wrap and keystream reuse
Weaknesses		CWE-323
References		https://github.com/wolfSSL/wolfssl/pull/10709 https://www.wolfssl.com/docs/security-vulnerabilities/
Metrics		cvssV4_0 `{'score': 2, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}`

MITRE

Status: PUBLISHED

Assigner: wolfSSL

Published: 2026-06-25T16:53:14.695Z

Updated: 2026-06-25T17:57:09.838Z

Reserved: 2026-06-17T22:11:03.531Z

Link: CVE-2026-55967

Vulnrichment

Updated: 2026-06-25T17:57:06.377Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-06-25T19:15:16Z

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55967", "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "state": "PUBLISHED", "assignerShortName": "wolfSSL", "dateReserved": "2026-06-17T22:11:03.531Z", "datePublished": "2026-06-25T16:53:14.695Z", "dateUpdated": "2026-06-25T17:57:09.838Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "shortName": "wolfSSL", "dateUpdated": "2026-06-25T16:53:14.695Z"}, "title": "AES-GCM streaming APIs do not reject >64 GiB cumulative single messages, enabling counter wrap and keystream reuse", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-323", "description": "CWE-323 Reusing a Nonce, Key Pair in Encryption", "type": "CWE"}]}], "affected": [{"vendor": "wolfSSL", "product": "wolfSSL", "collectionURL": "https://github.com/wolfSSL/wolfssl", "versions": [{"status": "affected", "version": "4.8.0", "lessThanOrEqual": "5.9.1", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.</p>"}]}], "references": [{"url": "https://github.com/wolfSSL/wolfssl/pull/10709", "tags": ["patch"]}, {"url": "https://www.wolfssl.com/docs/security-vulnerabilities/"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "LOW", "baseScore": 2, "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "NVIDIA Project Vanessa", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-25T17:57:03.803039Z", "id": "CVE-2026-55967", "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": "2026-06-25T17:57:09.838Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-55967", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-25T17:57:03.803039Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-25T17:57:06.377Z"}}], "cna": {"title": "AES-GCM streaming APIs do not reject >64 GiB cumulative single messages, enabling counter wrap and keystream reuse", "source": {"discovery": "UNKNOWN"}, "credits": [{"lang": "en", "type": "finder", "value": "NVIDIA Project Vanessa"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 2, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "wolfSSL", "product": "wolfSSL", "versions": [{"status": "affected", "version": "4.8.0", "versionType": "semver", "lessThanOrEqual": "5.9.1"}], "collectionURL": "https://github.com/wolfSSL/wolfssl", "defaultStatus": "unaffected"}], "references": [{"url": "https://github.com/wolfSSL/wolfssl/pull/10709", "tags": ["patch"]}, {"url": "https://www.wolfssl.com/docs/security-vulnerabilities/"}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.", "supportingMedia": [{"type": "text/html", "value": "<p>AES-GCM encryption/decryption with extremely large cumulative single message sizes (>64 GiB) were not properly rejected by the streaming APIs, allowing counter wrap, keystream reuse, and consequent plaintext recovery.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-323", "description": "CWE-323 Reusing a Nonce, Key Pair in Encryption"}]}], "providerMetadata": {"orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "shortName": "wolfSSL", "dateUpdated": "2026-06-25T16:53:14.695Z"}}}, "cveMetadata": {"cveId": "CVE-2026-55967", "state": "PUBLISHED", "dateUpdated": "2026-06-25T17:57:09.838Z", "dateReserved": "2026-06-17T22:11:03.531Z", "assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27", "datePublished": "2026-06-25T16:53:14.695Z", "assignerShortName": "wolfSSL"}, "dataVersion": "5.2"}