CVE-2026-53910

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Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds.\nWhen processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out\u2011of\u2011bounds writes during internal processing.\u00a0\nAn attacker who can control the output of the diff program used by diff3 (e.g. via --diff-program pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment.\n\n\nThis issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815\u00a0\n\nNOTE:\nThe project maintainers claim that this is not a security issue. They state that the worst outcome this issue can cause is a crash of diff and that it cannot be used to escalate privileges.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<i>diff3</i>&nbsp;tool from GNU diffutils&nbsp;is vulnerable to a heap\u2011based buffer overflow due to multiple signed integer overflows in line\u2011mapping calculations. Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds.<br>When processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out\u2011of\u2011bounds writes during internal processing.&nbsp;<br>An attacker who can control the output of the <i>diff</i> program used by <i>diff3</i> (e.g. via <i>--diff-program</i> pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment.<div><br><p>This issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815&nbsp;<br><br>NOTE:<br>The project maintainers claim that this is not a security issue. 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Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds.\nWhen processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out\u2011of\u2011bounds writes during internal processing.\u00a0\nAn attacker who can control the output of the diff program used by diff3 (e.g. via --diff-program pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment.\n\n\nThis issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815\u00a0\n\nNOTE:\nThe project maintainers claim that this is not a security issue. 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Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds.<br>When processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out\u2011of\u2011bounds writes during internal processing.&nbsp;<br>An attacker who can control the output of the <i>diff</i> program used by <i>diff3</i> (e.g. via <i>--diff-program</i> pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment.<div><br><p>This issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815&nbsp;<br><br>NOTE:<br>The project maintainers claim that this is not a security issue. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["diff3"], "product": "diffutils", "repo": "https://git.savannah.gnu.org/cgit/diffutils.git/", "vendor": "GNU", "versions": [{"lessThanOrEqual": "3.12", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "cvd@cert.pl"}], "cveTags": [{"sourceIdentifier": "cvd@cert.pl", "tags": ["disputed"]}], "descriptions": [{"lang": "en", "value": "diff3\u00a0tool from GNU diffutils\u00a0is vulnerable to a heap\u2011based buffer overflow due to multiple signed integer overflows in line\u2011mapping calculations. Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds.\nWhen processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out\u2011of\u2011bounds writes during internal processing.\u00a0\nAn attacker who can control the output of the diff program used by diff3 (e.g. via --diff-program pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment.\n\n\nThis issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815\u00a0\n\nNOTE:\nThe project maintainers claim that this is not a security issue. They state that the worst outcome this issue can cause is a crash of diff and that it cannot be used to escalate privileges."}, {"lang": "es", "value": "La herramienta diff3 de GNU diffutils es vulnerable a un desbordamiento de b\u00fafer basado en mont\u00f3n debido a m\u00faltiples desbordamientos de enteros con signo en los c\u00e1lculos de mapeo de l\u00edneas. La aritm\u00e9tica incorrecta al mapear rangos de l\u00edneas puede resultar en que se utilicen valores corruptos para la asignaci\u00f3n de memoria y los l\u00edmites de bucle.\nAl procesar una salida diff manipulada, estos desbordamientos pueden causar que la aplicaci\u00f3n asigne memoria insuficiente y posteriormente realice escrituras fuera de l\u00edmites durante el procesamiento interno.\nUn atacante que puede controlar la salida del programa diff utilizado por diff3 (por ejemplo, a trav\u00e9s de --diff-program apuntando a un script malicioso) puede desencadenar escrituras fuera de l\u00edmites, resultando en un fallo y potencialmente ejecuci\u00f3n remota de c\u00f3digo dependiendo del entorno.\n\nEste problema ha sido solucionado en el commit 9ff04d5b84743e331e80b589335a52c5480d1815\n\nNOTA:\nLos mantenedores del proyecto afirman que esto no es un problema de seguridad. Afirman que el peor resultado que este problema puede causar es un fallo de diff y que no puede ser utilizado para escalar privilegios."}], "id": "CVE-2026-53910", "lastModified": "2026-10-24T13:10:00.147", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cvd@cert.pl", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53910", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-22T19:11:21.494984Z", "version": "2.0.3"}}]}, "published": "2026-07-22T14:17:21.030", "references": [{"source": "cvd@cert.pl", "url": "https://cert.pl/en/posts/2026/07/CVE-2026-53910"}, {"source": "cvd@cert.pl", "url": "https://cgit.git.savannah.gnu.org/cgit/diffutils.git/commit/?id=73ed7ce85cc78effb94daf028c9af6b4e5252e50"}, {"source": "cvd@cert.pl", "url": "https://cgit.git.savannah.gnu.org/cgit/diffutils.git/commit/?id=9ff04d5b84743e331e80b589335a52c5480d1815"}, {"source": "cvd@cert.pl", "url": "https://git.savannah.gnu.org/cgit/diffutils.git/"}], "sourceIdentifier": "cvd@cert.pl", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "cvd@cert.pl", "type": "Secondary"}]}

{"bugzilla": {"description": "diffutils: heap\u2011based buffer overflow due to multiple signed integer overflows in line\u2011mapping calculations", "id": "2506145", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506145"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-190", "details": ["diff3\u00a0tool from GNU diffutils\u00a0is vulnerable to a heap\u2011based buffer overflow due to multiple signed integer overflows in line\u2011mapping calculations. Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds.\nWhen processing crafted diff output, these overflows may cause the application to allocate insufficient memory and subsequently perform out\u2011of\u2011bounds writes during internal processing.\u00a0\nAn attacker who can control the output of the diff program used by diff3 (e.g. via --diff-program pointing to a malicious script) can trigger out-of-bounds writes, resulting in a crash and potentially remote code execution depending on the environment.\nThis issue has been fixed in commit 9ff04d5b84743e331e80b589335a52c5480d1815\u00a0\nNOTE:\nThe project maintainers claim that this is not a security issue. They state that the worst outcome this issue can cause is a crash of diff and that it cannot be used to escalate privileges.", "A flaw was found in the diff3 program in the diffutils package. When processing specially crafted diff output, a heap-based buffer overflow can occur due to multiple signed integer overflows in line-mapping calculations. Incorrect arithmetic in mapping line ranges can result in corrupted values being used for memory allocation and loop bounds, resulting in a denial of service or memory corruption."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, do not run the diff3 program with untrusted input for the --diff-program argument or process untrusted diff output."}, "name": "CVE-2026-53910", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "diffutils", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "diffutils", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "diffutils", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "diffutils", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "diffutils", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "diffutils", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-22T13:42:50Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53910\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53910\nhttps://cert.pl/en/posts/2026/07/CVE-2026-53910\nhttps://cgit.git.savannah.gnu.org/cgit/diffutils.git/commit/?id=73ed7ce85cc78effb94daf028c9af6b4e5252e50\nhttps://cgit.git.savannah.gnu.org/cgit/diffutils.git/commit/?id=9ff04d5b84743e331e80b589335a52c5480d1815\nhttps://git.savannah.gnu.org/cgit/diffutils.git/"], "statement": "To exploit this vulnerability, an attacker needs to be able to control the output of the diff program used by diff3 (e.g., via --diff-program pointing to a malicious script) or convince a user to execute diff3 with specially crafted diff output. An attacker often needs prior execution privileges to supply the malicious diff output, meaning they already have the ability to execute arbitrary scripts on the system. Due to these reasons, this vulnerability has been rated with a low severity.", "threat_severity": "Low"}

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