CVE-2026-53259: Software Security Vulnerability Vulnerability
HIGHCVE-2026-53259 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-416: Use After Free) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.. Remediation is available in the latest vendor maintenance releases.
CVE-2026-53259 at a Glance
Security Impact
CVSS: 7.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-53259
To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:treeHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-53259, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:treeAnalyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.
Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
References
Frequently Asked Questions
What is CVE-2026-53259?
Which Software versions are affected?
What version fixes CVE-2026-53259?
What is the CVSS score of CVE-2026-53259?
What CWE is associated with CVE-2026-53259?
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Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-hqjh-c323-5jv8",
"modified" : "2026-06-28T09:31:47Z",
"published" : "2026-06-25T09:31:22Z",
"aliases" : [ "CVE-2026-53259" ],
"details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: anycast: insert aca into global hash under idev->lock\n\nsyzbot reported a splat [1]: a slab-use-after-free in\nipv6_chk_acast_addr(), which walks the global inet6_acaddr_lst[] hash\nunder RCU and dereferences a struct ifacaddr6 that has already been\nfreed while still linked in the hash, so a later reader walks into a\ndangling node.\n\nIn __ipv6_dev_ac_inc() the aca is allocated with refcount 1, then\naca_get() bumps it to 2 to keep it alive across the unlocked region.\nIt is published to idev->ac_list under idev->lock, but\nipv6_add_acaddr_hash() runs after write_unlock_bh(). A concurrent\nteardown (ipv6_ac_destroy_dev() from addrconf_ifdown(), under RTNL)\ncan slip into that window:\n\n CPU0 __ipv6_dev_ac_inc CPU1 ipv6_ac_destroy_dev (RTNL)\n ------------------------------ ------------------------------------\n aca_alloc() refcnt 1\n aca_get() refcnt 2\n write_lock_bh(idev->lock)\n add aca to ac_list\n write_unlock_bh(idev->lock)\n write_lock_bh(idev->lock)\n pull aca off ac_list\n write_unlock_bh(idev->lock)\n ipv6_del_acaddr_hash(aca)\n hlist_del_init_rcu() is a no-op,\n aca is not in the hash yet\n aca_put() refcnt 2->1\n ipv6_add_acaddr_hash(aca)\n aca now inserted into the hash\n aca_put() refcnt 1->0\n call_rcu(aca_free_rcu) -> kfree(aca)\n\nThe hash removal becomes a no-op because the insertion has not\nhappened yet, so once CPU0 inserts and drops the last reference, the\naca is freed while still linked in inet6_acaddr_lst[], and readers\ndereference freed memory after the slab slot is reused.\n\nThis window opened once RTNL stopped serializing the join path against\ndevice teardown. Move ipv6_add_acaddr_hash() inside the idev->lock\nsection so the ac_list and hash insertions are atomic with respect to\nteardown: a racing remover now either misses the aca entirely or finds\nit in both lists.\n\nacaddr_hash_lock is now nested under idev->lock, which is acquired in\nsoftirq context, so switch all acaddr_hash_lock sites to spin_lock_bh()\nto avoid the irq lock inversion reported in [2].\n\n[1] https://syzkaller.appspot.com/bug?extid=a01df04303c131efbf3a\n[2] https://lore.kernel.org/netdev/6a194ef7.ba3b1513.1890b4.0000.GAE@google.com/",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-53259"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/15be7e9fdbff831fb3e89b83cc337a4f85ad3310"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/3a967c498baa976b11d4800dda224c507416e97c"
}, {
"type" : "WEB",
"url" : "https://git.kernel.org/stable/c/f723ccaff2fb72b71ae8a9fd283f0dee4d9ae7a3"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-416" ],
"severity" : "HIGH",
"github_reviewed" : false,
"github_reviewed_at" : null,
"nvd_published_at" : "2026-06-25T09:16:43Z"
}
}