CVE-2026-40553 (GCVE-0-2026-40553)
Vulnerability from cvelistv5
Published
2026-07-13 12:07
Modified
2026-07-13 13:00
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-121 - Stack-based Buffer Overflow
Summary
Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and below.
References
| URL | Tags | |
|---|---|---|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-40553",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-13T13:00:40.324542Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T13:00:45.449Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "gawk",
"programFiles": [
"readdir.c"
],
"programRoutines": [
{
"name": "ftype()"
}
],
"repo": "https://cgit.git.savannah.gnu.org/cgit/gawk.git/",
"vendor": "GNU",
"versions": [
{
"lessThanOrEqual": "5.4.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Micha\u0142 Majchrowicz (AFINE)"
},
{
"lang": "en",
"type": "finder",
"value": "Marcin Wyczechowski (AFINE)"
}
],
"datePublic": "2026-07-13T12:07:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Buffer overflow vulnerability has been found in \"\u003cspan\u003e\u003cspan\u003eextension/readdir.c\u003c/span\u003e\u003c/span\u003e\" program file of gawk (ftype()\u0026nbsp;\u003cspan\u003eroutine)\u003c/span\u003e. \u003cspan\u003eThis issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. \u003c/span\u003e\u003cspan\u003eIt affects\u003c/span\u003e\u0026nbsp;gawk in versions 5.4.0 and below.\u003cbr\u003e\u003cbr\u003e"
}
],
"value": "Buffer overflow vulnerability has been found in \"extension/readdir.c\" program file of gawk (ftype()\u00a0routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects\u00a0gawk in versions 5.4.0 and below."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 5.1,
"baseSeverity": "MEDIUM",
"exploitMaturity": "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:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-121",
"description": "CWE-121 Stack-based Buffer Overflow",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T12:11:30.685Z",
"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"shortName": "CERT-PL"
},
"references": [
{
"tags": [
"patch"
],
"url": "https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=cca0366144336b49aaa7d5d949966ce8e2c70843"
},
{
"tags": [
"third-party-advisory"
],
"url": "https://cert.pl/en/posts/2026/07/CVE-2026-40467"
}
],
"source": {
"discovery": "EXTERNAL"
},
"tags": [
"x_open-source"
],
"title": "Stack-based buffer overflow in gawk",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"assignerShortName": "CERT-PL",
"cveId": "CVE-2026-40553",
"datePublished": "2026-07-13T12:07:56.611Z",
"dateReserved": "2026-04-14T09:44:32.553Z",
"dateUpdated": "2026-07-13T13:00:45.449Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-40553\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-13T13:00:40.324542Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-13T13:00:42.460Z\"}}], \"cna\": {\"tags\": [\"x_open-source\"], \"title\": \"Stack-based buffer overflow in gawk\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Micha\\u0142 Majchrowicz (AFINE)\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Marcin Wyczechowski (AFINE)\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 5.1, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"LOW\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"LOW\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://cgit.git.savannah.gnu.org/cgit/gawk.git/\", \"vendor\": \"GNU\", \"product\": \"gawk\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.0\"}], \"programFiles\": [\"readdir.c\"], \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"ftype()\"}]}], \"datePublic\": \"2026-07-13T12:07:00.000Z\", \"references\": [{\"url\": \"https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=cca0366144336b49aaa7d5d949966ce8e2c70843\", \"tags\": [\"patch\"]}, {\"url\": \"https://cert.pl/en/posts/2026/07/CVE-2026-40467\", \"tags\": [\"third-party-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Buffer overflow vulnerability has been found in \\\"extension/readdir.c\\\" program file of gawk (ftype()\\u00a0routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects\\u00a0gawk in versions 5.4.0 and below.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Buffer overflow vulnerability has been found in \\\"\u003cspan\u003e\u003cspan\u003eextension/readdir.c\u003c/span\u003e\u003c/span\u003e\\\" program file of gawk (ftype()\u0026nbsp;\u003cspan\u003eroutine)\u003c/span\u003e. \u003cspan\u003eThis issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. \u003c/span\u003e\u003cspan\u003eIt affects\u003c/span\u003e\u0026nbsp;gawk in versions 5.4.0 and below.\u003cbr\u003e\u003cbr\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-121\", \"description\": \"CWE-121 Stack-based Buffer Overflow\"}]}], \"providerMetadata\": {\"orgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"shortName\": \"CERT-PL\", \"dateUpdated\": \"2026-07-13T12:11:30.685Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-40553\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-13T13:00:45.449Z\", \"dateReserved\": \"2026-04-14T09:44:32.553Z\", \"assignerOrgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"datePublished\": \"2026-07-13T12:07:56.611Z\", \"assignerShortName\": \"CERT-PL\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…