CVE-2026-102822

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{"affected": [{"affectedData": [{"product": "russh", "vendor": "Eugeny", "versions": [{"status": "affected", "version": "< 0.63.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Russh is a Rust SSH client and server library. Prior to 0.63.1, a connection configured to permit mac=none can negotiate it with a MAC-requiring CTR or CBC block cipher because the selection logic validates needs_mac() only when MAC selection fails. A remote peer can then send a packet with a decrypted length of zero, causing russh/src/cipher/mod.rs to shrink the previously read block before indexing buffer.buffer[16..], which panics and terminates the connection task. This issue is fixed in version 0.63.1."}], "id": "CVE-2026-102822", "lastModified": "2026-09-29T20:17:17.673", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-102822", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-29T19:53:03.923621Z", "version": "2.0.3"}}]}, "published": "2026-09-29T19:17:24.190", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/commit/2885385abfee279092a41d80c6cb6ac367353159"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/releases/tag/v0.63.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "russh: russh: Denial of Service via improper MAC negotiation with block ciphers", "id": "2543499", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543499"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in russh. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by terminating active connection tasks. When a connection is configured to permit sessions without a Message Authentication Code (MAC), improper algorithm negotiation allows pairing with block ciphers that require authentication. A remote peer can then send a specially crafted packet that triggers an out-of-bounds indexing error, causing the connection process to crash."], "name": "CVE-2026-102822", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openshell", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-29T18:23:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-102822\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-102822\nhttps://github.com/Eugeny/russh/commit/2885385abfee279092a41d80c6cb6ac367353159\nhttps://github.com/Eugeny/russh/releases/tag/v0.63.1\nhttps://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.63.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "russh", "source": "cna", "vendor": "Eugeny"}, "product": "russh", "vendor": "eugeny"}], "created": "2026-09-29T21:30:08.563337+00:00", "updated": "2026-09-30T09:00:07.448687+00:00", "vendors": ["eugeny", "eugeny$PRODUCT$russh"]}