CVE-2026-18511 (GCVE-0-2026-18511)
Vulnerability from cvelistv5 – Published: 2026-08-13 20:43 – Updated: 2026-08-14 13:48
VLAI
EPSS
VEX
Title
IBM i is Affected By Multiple Vulnerabilities in Java Secure Sockets Extension
Summary
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 13:36 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7283285 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | i |
Affected:
7.6
Affected: 7.5 Affected: 7.4 Affected: 7.3 cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:* |
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https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088 7.5SJ11068\\nSJ11073\\nSJ11070\\nSJ11077\\nSJ11087\\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087 7.4SJ11071\\nSJ11069\\nSJ11076\\nSJ11086\\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086 7.3SJ11067\\nSJ11075\\nSJ11085\\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075 \\n https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085 \\n\\n\\n\\nIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003cstrong\u003eIBM strongly recommends addressing the vulnerability now.\u003c/strong\u003e\u003c/p\u003e\u003cdiv\u003e\u003ctable\u003e\u003ccolgroup\u003e\u003ccol/\u003e\u003ccol/\u003e\u003ccol/\u003e\u003c/colgroup\u003e\u003cthead\u003e\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eIBM i Release\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003e5770-JV1\u003cbr/\u003ePTF Number(s)\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003ePTF Download Link(s)\u003c/strong\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd\u003e7.6\u003c/td\u003e\u003ctd\u003eSJ11036\u003cbr/\u003eSJ11072\u003cbr/\u003eSJ11082\u003cbr/\u003eSJ11088\u003c/td\u003e\u003ctd\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11036\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11072\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11082\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11088\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e7.5\u003c/td\u003e\u003ctd\u003eSJ11068\u003cbr/\u003eSJ11073\u003cbr/\u003eSJ11070\u003cbr/\u003eSJ11077\u003cbr/\u003eSJ11087\u003cbr/\u003e\u003c/td\u003e\u003ctd\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11068\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11073\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11070\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11077\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11087\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e7.4\u003c/td\u003e\u003ctd\u003eSJ11071\u003cbr/\u003eSJ11069\u003cbr/\u003eSJ11076\u003cbr/\u003eSJ11086\u003cbr/\u003e\u003c/td\u003e\u003ctd\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11071\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11069\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11076\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11086\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e7.3\u003c/td\u003e\u003ctd\u003eSJ11067\u003cbr/\u003eSJ11075\u003cbr/\u003eSJ11085\u003cbr/\u003e\u003c/td\u003e\u003ctd\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11067\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11075\u003c/a\u003e\u003cbr/\u003e\u003ca href=\\\"https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085\\\" rel=\\\"nofollow\\\"\u003ehttps://www.ibm.com/mysupport/s/fix-information?legacy=SJ11085\u003c/a\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/table\u003e\u003c/div\u003e\u003cp\u003eIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://www.ibm.com/support/pages/node/7283285\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eIBM i 7.6, 7.5, 7.4, and 7.3 could allow a local authenticated attacker to generate a stack-based buffer overflow in the Native IBM i JSSE provider, caused by improper bounds checking during TLS session establishment. A local attacker could overflow a fixed-length buffer and execute arbitrary code on the system or cause the JVM process to crash.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"9a959283-ebb5-44b6-b705-dcc2bbced522\", \"shortName\": \"ibm\", \"dateUpdated\": \"2026-08-13T20:43:37.477Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-18511\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-14T13:48:42.524Z\", \"dateReserved\": \"2026-07-31T17:24:47.213Z\", \"assignerOrgId\": \"9a959283-ebb5-44b6-b705-dcc2bbced522\", \"datePublished\": \"2026-08-13T20:43:37.477Z\", \"assignerShortName\": \"ibm\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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