CVE-2026-74577: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-c2h5-j92r-8w96
Share
Published
Advisory Summary

CVE-2026-74577 is a security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-74577 at a Glance

CVE Identifier CVE-2026-74577
GHSA Identifier GHSA-c2h5-j92r-8w96
Severity N/A
CVSS v3.1 Base Score N/A
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-74577

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.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-74577, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze 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 General Security Weakness. 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

In the Linux kernel, the following vulnerability has been resolved: net: mpls: initialize rtm_tos in mpls_getroute() mpls_getroute() builds the RTM_NEWROUTE reply to an RTM_GETROUTE request by filling a struct rtmsg allocated from an skb whose data area is not zeroed (alloc_skb(NLMSG_GOODSIZE, ...)). It sets every field of the header except rtm_tos: r = nlmsg_data(nlh); r->rtm_family = AF_MPLS; r->rtm_dst_len = 20; r->rtm_src_len = 0; r->rtm_table = RT_TABLE_MAIN; r->rtm_type = RTN_UNICAST; r->rtm_scope = RT_SCOPE_UNIVERSE; r->rtm_protocol = rt->rt_protocol; r->rtm_flags = 0; struct rtmsg has no padding, so the one uninitialised byte rtm_tos (offset 3) is copied straight to user space on recvmsg(), leaking a byte of uninitialised heap memory. This is in contrast to mpls_dump_route(), which fills the very same header and does set rtm_tos = 0. Initialize rtm_tos to 0, matching mpls_dump_route(). Reproduced with KMSAN by adding an MPLS route and issuing a non-RTM_F_FIB_MATCH RTM_GETROUTE for its label: BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x36c/0x33f0 _copy_to_iter+0x36c/0x33f0 __skb_datagram_iter+0x196/0x12c0 skb_copy_datagram_iter+0x5b/0x210 netlink_recvmsg+0x37b/0xef0 ... Uninit was created at: __alloc_skb+0x8ca/0x10e0 mpls_getroute+0x1280/0x3a40 rtnetlink_rcv_msg+0x1138/0x15a0 ... Byte 19 of 64 is uninitialized (byte 19 = nlmsghdr(16) + rtmsg offset 3 = rtm_tos)

References

NVD — CVE-2026-74577 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74577
git.kernel.org/stable/c/1fea5ff0eb... WEB
https://git.kernel.org/stable/c/1fea5ff0eb4aa7e951bb3d380248566c473aa377
git.kernel.org/stable/c/248718fd88... WEB
https://git.kernel.org/stable/c/248718fd88b146d8bdc7610ecd1eb4cd16e0b5a1
git.kernel.org/stable/c/295dd295e2... WEB
https://git.kernel.org/stable/c/295dd295e2137e10e9a5b1891d97e0f08de76f03
git.kernel.org/stable/c/2dc2fffc70... WEB
https://git.kernel.org/stable/c/2dc2fffc704a4365cae1aae078ba62223aaeff93
git.kernel.org/stable/c/466b474a8d... WEB
https://git.kernel.org/stable/c/466b474a8deb0c93b5280c6d261e5eda6482eca7
git.kernel.org/stable/c/95651461cf... WEB
https://git.kernel.org/stable/c/95651461cf77cc6590fa08c87667717e5dcfa55d
git.kernel.org/stable/c/a5cdd2407d... WEB
https://git.kernel.org/stable/c/a5cdd2407dd890f741f59b8367e4c6c101cce154
git.kernel.org/stable/c/ba56f88aab... WEB
https://git.kernel.org/stable/c/ba56f88aab18d982f2a21f11390f4d8a8897782a

Frequently Asked Questions

What is CVE-2026-74577?
CVE-2026-74577 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-74577?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-74577?
CVE-2026-74577 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-74577?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-c2h5-j92r-8w96",
  "modified" : "2026-08-19T18:32:33Z",
  "published" : "2026-08-15T15:30:37Z",
  "aliases" : [ "CVE-2026-74577" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mpls: initialize rtm_tos in mpls_getroute()\n\nmpls_getroute() builds the RTM_NEWROUTE reply to an RTM_GETROUTE\nrequest by filling a struct rtmsg allocated from an skb whose data\narea is not zeroed (alloc_skb(NLMSG_GOODSIZE, ...)). It sets every\nfield of the header except rtm_tos:\n\n\tr = nlmsg_data(nlh);\n\tr->rtm_family\t = AF_MPLS;\n\tr->rtm_dst_len\t= 20;\n\tr->rtm_src_len\t= 0;\n\tr->rtm_table\t= RT_TABLE_MAIN;\n\tr->rtm_type\t= RTN_UNICAST;\n\tr->rtm_scope\t= RT_SCOPE_UNIVERSE;\n\tr->rtm_protocol = rt->rt_protocol;\n\tr->rtm_flags\t= 0;\n\nstruct rtmsg has no padding, so the one uninitialised byte rtm_tos\n(offset 3) is copied straight to user space on recvmsg(), leaking a\nbyte of uninitialised heap memory. This is in contrast to\nmpls_dump_route(), which fills the very same header and does set\nrtm_tos = 0.\n\nInitialize rtm_tos to 0, matching mpls_dump_route().\n\nReproduced with KMSAN by adding an MPLS route and issuing a\nnon-RTM_F_FIB_MATCH RTM_GETROUTE for its label:\n\n  BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x36c/0x33f0\n   _copy_to_iter+0x36c/0x33f0\n   __skb_datagram_iter+0x196/0x12c0\n   skb_copy_datagram_iter+0x5b/0x210\n   netlink_recvmsg+0x37b/0xef0\n   ...\n  Uninit was created at:\n   __alloc_skb+0x8ca/0x10e0\n   mpls_getroute+0x1280/0x3a40\n   rtnetlink_rcv_msg+0x1138/0x15a0\n   ...\n  Byte 19 of 64 is uninitialized\n\n(byte 19 = nlmsghdr(16) + rtmsg offset 3 = rtm_tos)",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-74577"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1fea5ff0eb4aa7e951bb3d380248566c473aa377"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/248718fd88b146d8bdc7610ecd1eb4cd16e0b5a1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/295dd295e2137e10e9a5b1891d97e0f08de76f03"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2dc2fffc704a4365cae1aae078ba62223aaeff93"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/466b474a8deb0c93b5280c6d261e5eda6482eca7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/95651461cf77cc6590fa08c87667717e5dcfa55d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/a5cdd2407dd890f741f59b8367e4c6c101cce154"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ba56f88aab18d982f2a21f11390f4d8a8897782a"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-15T13:18:03Z"
  }
}