{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-85234", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-09-03T14:57:22.051Z", "datePublished": "2026-09-15T17:58:51.667Z", "dateUpdated": "2026-10-08T09:13:30.520Z" }, "containers": { "cna": { "title": "Tftp: tftp-hpa: denial of service due to out-of-bounds read/write in remap engine", "metrics": [ { "other": { "content": { "value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "format": "CVSS" } ], "descriptions": [ { "lang": "en", "value": "A flaw was found in tftp-hpa. When the `in.tftpd` remap engine processes an inverse remap rule that also aborts with a non-empty custom error message, it can pass invalid match offsets to the `genmatchstring()` function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service." } ], "affected": [ { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "tftp", "defaultStatus": "affected", "versions": [ { "version": "0:5.2-28.el8_10", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:enterprise_linux:8::appstream" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "tftp", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:10" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "tftp", "defaultStatus": "unknown", "cpes": [ "cpe:/o:redhat:enterprise_linux:6" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "tftp", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "tftp", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ] }, { "vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "erlang27", "defaultStatus": "unaffected", "cpes": [ "cpe:/a:redhat:hummingbird:1" ] } ], "references": [ { "url": "https://access.redhat.com/errata/RHSA-2026:78952", "name": "RHSA-2026:78952", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/security/cve/CVE-2026-85234", "tags": [ "vdb-entry", "x_refsource_REDHAT" ] }, { "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460997", "name": "RHBZ#2460997", "tags": [ "issue-tracking", "x_refsource_REDHAT" ] }, { "url": "https://git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/commit/?id=4b493532f5ce052a1c124acd0661233ec7918327" } ], "datePublic": "2026-09-15T15:36:00.000Z", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-125", "description": "Out-of-bounds Read", "lang": "en", "type": "CWE" } ] } ], "x_redhatCweChain": "CWE-125: Out-of-bounds Read", "workarounds": [ { "lang": "en", "value": "To mitigate this issue, avoid enabling filename remapping with the `m/-map-file` option for the `in.tftpd` service unless strictly necessary. If filename remapping is required, ensure that any inverse (`~`) and abort (`a`) rules in the remap file do not include a non-empty custom error message. Changes to the `in.tftpd` configuration may require restarting the service to take effect." } ], "timeline": [ { "lang": "en", "time": "2026-04-23T01:23:46.000Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-09-15T15:36:00.000Z", "value": "Made public." } ], "credits": [ { "lang": "en", "value": "This issue was discovered by Found by AISLE in partnership with Red Hat." } ], "providerMetadata": { "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-10-08T09:13:30.520Z" }, "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-09-15T19:07:11.649679Z", "id": "CVE-2026-85234", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "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": "2026-09-15T19:43:52.914Z" } } ] } }