# CVE-2026-53495: containerd CRI ExecSync Goroutine Leak Leading to Node-Level Denial of Service > Attackers can cause node-level denial of service in containerd by triggering goroutine leaks via CRI ExecSync, requiring an upgrade to fixed versions. - **Severity:** Medium 6.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 14 Sep 2026 - **Updated:** 14 Sep 2026 - **Also known as:** AZL-100986, AZL-101004, BELL-CVE-2026-53495, CLEANSTART-2026-HA58928, CLEANSTART-2026-MU77923, CLEANSTART-2026-NV54343, DEBIAN-CVE-2026-53495, ECHO-3260-32c0-5c56, GHSA-7jxh-36q5-gcqv, GO-2026-6444, MINI-22fq-73fm-v5jc, MINI-22rq-qm99-qrpm, MINI-28c2-w988-86v3, MINI-28jx-g82p-f4xh, MINI-29cq-r244-2j24, MINI-2c58-q9h6-r4ww, MINI-2g5p-3cg4-6rcm, MINI-2p36-4rh2-xrh3, MINI-2pq7-fjmc-9xjx, MINI-2q3j-45jj-74fg, MINI-2r3q-3xm7-722q, MINI-2rc4-6w87-996w, MINI-2wr2-3r26-v768, MINI-324q-hhqj-54f7, MINI-329r-2qh8-vpcp, MINI-3362-5f8h-mxf6, MINI-33cg-9g7w-gv25, MINI-33gv-cm74-25f6, MINI-35g8-3wgp-g9j9, MINI-37wc-6fq7-vwpf, MINI-38pw-mf72-6jfr, MINI-39hc-8rpq-m7hw, MINI-39mr-9h6w-qrqq, MINI-39rw-wcf2-q2mp, MINI-3jmr-q35q-xpq6, MINI-3pwh-w8r9-hc9c, MINI-3q2h-97qw-7gfj, MINI-3r3h-c5q9-67cw, MINI-42cv-qfvf-r453, MINI-42pf-87m6-3h2f, MINI-4478-wpq7-qhx2, MINI-46wq-gjw2-2w24, MINI-48xw-6p3q-784m, MINI-4jhv-5r48-px8j, MINI-4p3f-vvrf-8wxj, MINI-4ph2-r9j5-2f78, MINI-4q8c-896f-jvqg, MINI-4r7m-m9p4-rpf2, MINI-4rr7-v372-8p45, MINI-4w4h-mg98-mmqc, MINI-5236-78c5-75qq, MINI-52gg-7xr7-j2h9, MINI-5389-g89q-365m, MINI-555q-2g25-g2cx, MINI-5587-c4gf-vwxp, MINI-574x-j3qh-hg5f, MINI-5763-rj88-g9r9, MINI-596h-v8hh-fqph, MINI-5j7p-c2vr-q9p9, MINI-5jgr-rpmw-9w87, MINI-5m9j-3wff-ppcr, MINI-5mvw-95w7-6c88, MINI-5pgg-ghpm-37hv, MINI-5q35-8f3m-rccx, MINI-5qxw-hm8w-27mg, MINI-5wcm-3c96-rfwg, MINI-6275-7rm3-577w, MINI-62r2-fw3j-x8p7, MINI-6433-pvq4-696v, MINI-6567-r29h-65g6, MINI-66fc-7ph6-4799, MINI-6h3f-c2j6-4rw2, MINI-6h3q-55rh-vxj7, MINI-6hvp-fw2c-4hfc, MINI-6hxv-j53p-5pr4, MINI-6j7q-493f-g9rq, MINI-6jch-933r-qc6j, MINI-6mrr-x9q3-q2pp, MINI-6p47-52gh-h3x6, MINI-6p9m-jmwx-3c78, MINI-6pjr-q2rm-766r, MINI-6rhw-qwvp-xm7j, MINI-6rj8-pjjg-g483, MINI-6wcc-q62g-4ww6, MINI-7247-7fhq-xc9h, MINI-726r-qpvq-gx7j, MINI-7344-6mmw-2wjp, MINI-73cm-x578-5p9f, MINI-73r6-jfxh-w8j5, MINI-78h3-m6mw-h4pv, MINI-7999-vfcf-4gxw, MINI-7c59-hp7v-699g, MINI-7fqj-9q7c-r85w, MINI-7fqj-pgwx-gjx9, MINI-7jxm-cfv5-qvmp, MINI-7mrg-mxgw-mgfj, MINI-7q27-4r8j-gv6h, MINI-7q9c-jqcv-c5wq, MINI-7qj2-6746-vrqv, MINI-7qrr-8mjr-93x7, MINI-7r4m-q5ff-jchm, MINI-8396-q77v-795j, MINI-83rm-hp4r-3whj, MINI-84rf-chmj-v8qq, MINI-88pq-2cgh-mm79, MINI-895j-wv38-r86w, MINI-8c49-jq65-5373, MINI-8gmr-32pg-rg5c, MINI-8gwp-gwgc-38j3, MINI-8mc4-vh5x-m73c, MINI-8pcm-h4w6-r8pm, MINI-8qf3-gphr-9wg3, MINI-8w8m-3h85-9ghx, MINI-938w-6m62-gjcv, MINI-93fh-xmf2-wcj8, MINI-93v6-rf2p-rhj7, MINI-95xq-xjpj-2h42, MINI-9ghx-p25w-8qrw, MINI-9r8r-3898-88pc, MINI-9rg5-r6fx-9pmw, MINI-9v7q-vfw2-ff42, MINI-9w9g-p6vv-gmm8, MINI-c25p-233f-q972, MINI-c2mq-qmj7-4843, MINI-c39r-c9mc-qv9q, MINI-c48g-f6v9-f8gh, MINI-c49x-3p5x-xfpf, MINI-c5x4-7958-98rh, MINI-c6pp-gp5w-6jvg, MINI-c74v-x478-w8v6, MINI-c98m-v47v-3xf2, MINI-cccv-2mqr-56xr, MINI-ccqc-2qrc-gg29, MINI-chcc-pj9v-fgrw, MINI-chwf-vj6g-q49r, MINI-cjvc-vfjc-phx8, MINI-cr67-xcfr-5crv, MINI-crrx-j5cj-c25r, MINI-cvgw-xm3r-6rpg, MINI-cvmq-4jf5-m2rm, MINI-cvwx-cgpp-7pgc, MINI-cwfq-h7q2-pg9r, MINI-cx34-rv9w-jx7j, MINI-f26f-8qr8-xc55, MINI-f5v7-7rgp-wm4q, MINI-f78h-94hc-h2vh, MINI-f874-4j2v-mj6f, MINI-f97c-25pr-h85f, MINI-fccr-5h9p-r4h9, MINI-ff4r-wf5j-jqqf, MINI-ffmg-rwm9-qjhq, MINI-fghr-8xq3-56hj, MINI-fgqv-p534-h86w, MINI-fgqx-2694-96rh, MINI-fm29-642f-g4vj, MINI-fp2j-j96x-3mq6, MINI-fp9g-9fh3-fp6v, MINI-fq58-vhqj-hhwj, MINI-fq76-39hh-996f, MINI-fq8g-c5w3-pq82, MINI-fqhx-x6pq-rxqm, MINI-fvjv-63xm-g45h, MINI-fwfm-x9p6-wgfg, MINI-g45x-q5f9-7gx9, MINI-g52q-6jqr-hfj4, MINI-g6wg-2pvp-v274, MINI-g74m-r3r3-6h4j, MINI-g8qf-xwfj-94m3, MINI-g968-rfcg-3hgx, MINI-gfj2-v3jq-vg2g, MINI-ghpw-324p-w6qr, MINI-gjvr-2phw-gf7j, MINI-gjxv-9fmr-rv62, MINI-gmrf-crhw-9v7m, MINI-gpc8-v8gr-4495, MINI-gq2c-575v-v9qw, MINI-gx45-ppw6-39vc, MINI-h498-rhmq-399x, MINI-h66r-wxg7-w28j, MINI-h7rf-6qh3-h633, MINI-h7v7-7pvw-gpmh, MINI-hh98-vx6c-vj44, MINI-hhrg-f64p-phh4, MINI-hjfw-ghpx-qqhp, MINI-hpgq-jf3v-j25w, MINI-hpr4-rpwx-ppv2, MINI-hvpj-45r7-8xmx, MINI-hw3c-7pmx-pgh3, MINI-j2xr-9996-5qg3, MINI-j543-6f4g-rj95, MINI-j582-6ggp-7w9v, MINI-j8c9-q7q4-fjh6, MINI-jmmh-pvjc-8397, MINI-jqc2-3r3r-mq6j, MINI-jvv7-jccx-575x, MINI-jx48-5f76-pw5v, MINI-jx59-5x2m-hq2w, MINI-m554-2xfp-42cm, MINI-m58q-xmxx-3jmw, MINI-m6h4-qjmh-xp5q, MINI-m6px-79c7-mj3w, MINI-m7mf-8hq9-8whc, MINI-mc43-p6rr-xgxf, MINI-mcr5-fr2p-r2jg, MINI-mfm7-4p6h-fw2x, MINI-mjwg-fjvr-gx9j, MINI-mmjp-3pj5-7922, MINI-mr24-q5j3-64mq, MINI-mvgj-ph8m-993q, MINI-p23x-gxg5-fhj7, MINI-p2r2-mx26-j5vh, MINI-p372-pg87-898p, MINI-p72v-72f6-2m9x, MINI-p7vm-8g37-9mxv, MINI-pcw4-mc9p-h758, MINI-pfpm-h9xv-hv2w, MINI-ph89-m8hq-c7v2, MINI-pj47-9mxf-gq85, MINI-pmpg-jf6q-h78v, MINI-pp8h-w366-828w, MINI-pqgf-3j33-rj4c, MINI-prcc-vhf5-prfr, MINI-prjc-xv98-hg8c, MINI-pv4x-5v5p-fh7f, MINI-pwjc-432c-7v6g, MINI-pxv4-h22q-rc3q, MINI-q267-jgr3-rmx7, MINI-q2gm-535x-w3hc, MINI-q2h8-65qv-x7g4, MINI-q4jm-qp2w-3w9w, MINI-q4q8-6vh6-pmcx, MINI-q5pj-6rj9-xpjj, MINI-q8q3-59j2-8c5g, MINI-q965-v5hr-5vp7, MINI-q99f-p9p7-c6f2, MINI-q9x4-388p-4h25, MINI-qg4h-3v5w-hf2w, MINI-qg6x-rxph-76m2, MINI-qgg4-3cfw-6x7h, MINI-qggx-xx3r-8hxh, MINI-qhwc-grg9-g2g6, MINI-qm35-wvc2-385j, MINI-qm58-cxfp-wr9v, MINI-qpm7-x89c-rx67, MINI-qw8w-hxx3-2mfj, MINI-r27w-cvgm-pf37, MINI-r3cj-pg8v-x3cc, MINI-r4qq-hwxx-26wv, MINI-r4wc-jp22-gpj9, MINI-r626-35mg-q6mp, MINI-r76m-hxmm-hc3f, MINI-r9qr-pp58-cw2j, MINI-rcv7-hhgj-xxh8, MINI-rh6v-cwgj-2ccf, MINI-rh8f-84xp-276v, MINI-rh9g-373f-848q, MINI-rjp3-ff2x-ghj5, MINI-rmh4-9f95-33m6, MINI-rp52-p8vp-hc44, MINI-rp76-86mp-8hqj, MINI-rpjx-wfq2-mpv4, MINI-rq87-h5w3-r9h3, MINI-rw6q-3wp4-q6w3, MINI-rxwq-88jx-f4g9, MINI-v322-65wc-cq4h, MINI-v49r-2p8r-74pg, MINI-v4xh-cmhm-fv97, MINI-v677-v9jh-xp8w, MINI-v92c-f62q-24c3, MINI-v9jq-96vw-w7mr, MINI-v9vq-p98g-35h4, MINI-vh27-cqq8-7rvw, MINI-vj6j-wpj4-9p88, MINI-vm4p-v5c7-c45r, MINI-vr77-xqq6-hgp5, MINI-vrf8-2vjc-9gp2, MINI-vv63-xjr6-j66x, MINI-vwfp-c338-7j8h, MINI-vx49-7x29-7756, MINI-w4q6-jcrh-7232, MINI-w4xm-2fmc-r9xv, MINI-w5mq-p7x2-24mx, MINI-w689-4766-w5vx, MINI-w779-295p-cvq2, MINI-w82q-qc9x-fq46, MINI-wh7x-7r4m-m7qc, MINI-wh98-vjjf-4r5q, MINI-wp74-9ppx-h82h, MINI-wpvj-ppc7-87vv, MINI-wqr5-3grq-288x, MINI-wwc2-9jqm-5m47, MINI-wwh9-73xc-qhw2, MINI-wxmp-p988-6fpw, MINI-wxv6-qf2v-v3v7, MINI-wxw5-ff39-c55h, MINI-x29r-934x-h3wx, MINI-x5q7-694j-hmx8, MINI-x6f5-24xc-76p4, MINI-x9g7-m3fx-q9c3, MINI-xc8h-265h-fmq9, MINI-xhp9-qf5p-mxhr, MINI-xj28-735h-9m8h, MINI-xrcp-c4jc-27c7, MINI-xrv5-29p4-jc48, MINI-xw5x-p852-cf6w, MINI-xxx7-m35w-ggm4, UBUNTU-CVE-2026-53495, openSUSE-SU-2026:11766-1, openSUSE-SU-2026:11977-1 ## What is CVE-2026-53495? CVE-2026-53495 is a medium-severity denial of service vulnerability in containerd, published on 14 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description containerd is an open-source container runtime. Prior to 1.7.35, 2.0.12, 2.2.8, and 2.3.5, containerd on Linux with the CRI plugin enabled can indefinitely block the drainExecSyncIO goroutine in internal/cri/server/container_execsync.go when CRI ExecSync is used by exec probes or lifecycle hooks that launch long-lived background child processes retaining standard input and output pipes. The input and output drain phase has no default timeout and did not stop when the request context was canceled, so repeated ExecSync invocations can accumulate blocked goroutines and host memory. The resulting resource exhaustion can cause the OOM killer to terminate containerd, leaving the container runtime unavailable until restart. Deployments not using containerd's CRI implementation and containers not running on Linux are not affected. This issue is fixed in versions 1.7.35, 2.0.12, 2.2.8, and 2.3.5. Weakness: CWE-400 (Uncontrolled Resource Consumption) ## Which versions are affected by CVE-2026-53495? 10 open source packages ship an affected version, including github.com/containerd/containerd/v2 and github.com/containerd/containerd. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `github.com/containerd/containerd/v2` | Go | All versions | 2.0.12, 2.2.8, 2.3.5 | | `github.com/containerd/containerd/v2` | Go | All versions | 2.0.12 | | `github.com/containerd/containerd/v2` | Go | All versions | 2.0.12 | | `github.com/containerd/containerd/v2` | Go | From 2.2.0 | 2.2.8 | | `github.com/containerd/containerd/v2` | Go | From 2.2.0 | 2.2.8 | | `github.com/containerd/containerd/v2` | Go | From 2.3.0 | 2.3.5 | | `github.com/containerd/containerd/v2` | Go | From 2.3.0 | 2.3.5 | | `github.com/containerd/containerd` | Go | All versions | 1.7.35 | | `github.com/containerd/containerd` | Go | All versions | 1.7.35 | | `github.com/containerd/containerd` | Go | All versions | 1.7.35 | | `hauler` | openSUSE:Tumbleweed | All versions | 2.1.0-4.1 | | `trivy` | openSUSE:Tumbleweed | All versions | 0.75.0-1.1 | ## How do I fix CVE-2026-53495? Upgrade github.com/containerd/containerd/v2 to a fixed version for your release line: 2.0.12, 2.2.8 or 2.3.5. ## Is CVE-2026-53495 being exploited? There is no known exploitation of CVE-2026-53495 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-53495 and fix it if it is affected. What it is: CVE-2026-53495 is a medium-severity denial of service vulnerability in containerd, published on 14 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-53495 in the wild and no public exploit code. Affected packages and fixed versions: - github.com/containerd/containerd/v2 (Go): affected all versions; fixed in 2.0.12, 2.2.8, 2.3.5 - github.com/containerd/containerd/v2 (Go): affected all versions; fixed in 2.0.12 - github.com/containerd/containerd/v2 (Go): affected all versions; fixed in 2.0.12 - github.com/containerd/containerd/v2 (Go): affected from 2.2.0; fixed in 2.2.8 - github.com/containerd/containerd/v2 (Go): affected from 2.2.0; fixed in 2.2.8 - github.com/containerd/containerd/v2 (Go): affected from 2.3.0; fixed in 2.3.5 - github.com/containerd/containerd/v2 (Go): affected from 2.3.0; fixed in 2.3.5 - github.com/containerd/containerd (Go): affected all versions; fixed in 1.7.35 - github.com/containerd/containerd (Go): affected all versions; fixed in 1.7.35 - github.com/containerd/containerd (Go): affected all versions; fixed in 1.7.35 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-53495/ (Markdown: https://insights.sbomify.com/CVE-2026-53495/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53495 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53495 - OSV: https://osv.dev/vulnerability/CVE-2026-53495 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-53495/ Summaries are generated and may contain mistakes; the official description above is the record.