180 lines
10 KiB
JSON
180 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-31406",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-03-09T15:48:24.086Z",
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"datePublished": "2026-04-06T07:38:18.840Z",
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"dateUpdated": "2026-08-05T12:22:15.395Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:22:15.395Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()\n\nAfter cancel_delayed_work_sync() is called from\nxfrm_nat_keepalive_net_fini(), xfrm_state_fini() flushes remaining\nstates via __xfrm_state_delete(), which calls\nxfrm_nat_keepalive_state_updated() to re-schedule nat_keepalive_work.\n\nThe following is a simple race scenario:\n\n cpu0 cpu1\n\ncleanup_net() [Round 1]\n ops_undo_list()\n xfrm_net_exit()\n xfrm_nat_keepalive_net_fini()\n cancel_delayed_work_sync(nat_keepalive_work);\n xfrm_state_fini()\n xfrm_state_flush()\n xfrm_state_delete(x)\n __xfrm_state_delete(x)\n xfrm_nat_keepalive_state_updated(x)\n schedule_delayed_work(nat_keepalive_work);\n rcu_barrier();\n net_complete_free();\n net_passive_dec(net);\n llist_add(&net->defer_free_list, &defer_free_list);\n\ncleanup_net() [Round 2]\n rcu_barrier();\n net_complete_free()\n kmem_cache_free(net_cachep, net);\n nat_keepalive_work()\n // on freed net\n\nTo prevent this, cancel_delayed_work_sync() is replaced with\ndisable_delayed_work_sync()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is reached through local namespace lifecycle and NETLINK_XFRM state configuration, not by remote packet processing. An attacker can create an affected outbound ESP-in-UDP XFRM state locally and tear down the network namespace.\nAC:L - The attacker controls creation of the NAT keepalive state and repeated teardown of the network namespace; the work reschedule after cancel is a direct consequence of the cleanup ordering. Any scheduling race can be retried and influenced locally, so there are no hard external conditions.\nPR:L - XFRM netlink operations require CAP_NET_ADMIN in the target network namespace. This is reachable by an unprivileged local user through a user namespace plus network namespace where they hold CAP_NET_ADMIN.\nUI:N - No victim action is required after the attacker runs local code. The attacker can configure the state and trigger namespace cleanup directly.\nS:U - The vulnerability corrupts kernel memory within the same kernel security authority. It is a standard local kernel compromise scenario, not a VM or hardware boundary escape.\nC:H - This is a use-after-free of a network namespace embedded delayed_work object and subsequent XFRM/netns state access. Per kernel scoring guidance, UAFs are treated as enabling high confidentiality impact.\nI:H - The dangling work item can operate on freed and potentially reclaimed kernel memory, giving a plausible path to memory corruption and control-flow compromise. Per kernel scoring guidance, UAFs are treated as high integrity impact.\nA:H - At minimum, executing delayed work on a freed struct net can dereference freed XFRM state and namespace data, causing an oops or panic. Repeated local triggering can reliably deny service."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/xfrm/xfrm_nat_keepalive.c"
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],
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"versions": [
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{
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"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
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"lessThan": "32d0f44c2f14d60fe8e920e69a28c11051543ec1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
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"lessThan": "2255ed6adbc3100d2c4a83abd9d0396d04b87792",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
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"lessThan": "21f2fc49ca6faa393c31da33b8a4e6c41fc84c13",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
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"lessThan": "daf8e3b253aa760ff9e96c7768a464bc1d6b3c90",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/xfrm/xfrm_nat_keepalive.c"
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],
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"versions": [
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{
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"version": "6.11",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.11",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.80",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.21",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19.11",
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"lessThanOrEqual": "6.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.12.80"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.18.21"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.19.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "7.0"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/32d0f44c2f14d60fe8e920e69a28c11051543ec1"
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},
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{
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"url": "https://git.kernel.org/stable/c/2255ed6adbc3100d2c4a83abd9d0396d04b87792"
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},
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{
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"url": "https://git.kernel.org/stable/c/21f2fc49ca6faa393c31da33b8a4e6c41fc84c13"
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},
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{
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"url": "https://git.kernel.org/stable/c/daf8e3b253aa760ff9e96c7768a464bc1d6b3c90"
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}
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],
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"title": "xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |