# CVE-2026-32952: go-ntlmssp NTLM challenges can panic on malformed payloads > A malicious NTLM challenge message can cause a slice out of bounds panic, crashing Go processes using the go-ntlmssp library. - **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 24 Apr 2026 - **Updated:** 24 Apr 2026 - **Also known as:** CLEANSTART-2026-ED54467, CLEANSTART-2026-KE06809, CLEANSTART-2026-LM20628, CLEANSTART-2026-RF76675, DEBIAN-CVE-2026-32952, GHSA-pjcq-xvwq-hhpj, GO-2026-5543, MINI-29jg-6xf5-vh84, MINI-2h3r-hr74-88cp, MINI-2pjv-ffhp-2cqr, MINI-32f8-w2f3-4w7p, MINI-32wv-8f3r-4c73, MINI-39hf-mxx6-wgrh, MINI-39v9-jcf7-wxgj, MINI-3q26-226w-33cc, MINI-3rgm-78wp-jvr6, MINI-3v97-5v8f-4rmm, MINI-44gg-j6wm-g57v, MINI-44pr-h866-p2xf, MINI-48w7-qqfg-5rm5, MINI-49qq-72w3-p3x4, MINI-4rcw-52p6-6qw5, MINI-533x-p9jq-hv5w, MINI-5867-vq5q-qmw2, MINI-588v-282g-9h4r, MINI-5953-g28v-8hrj, MINI-59p5-9qfp-v7fm, MINI-5f5r-84px-947x, MINI-5jqr-686j-f66m, MINI-5vvx-qqhj-mgqj, MINI-5whx-chp5-fphq, MINI-6224-2m67-wfpc, MINI-62xw-3pxh-87qp, MINI-662w-8vv5-jhv9, MINI-66f3-qgxg-qgp7, MINI-673j-677r-g836, MINI-6f29-jv5w-fjm5, MINI-6fv7-4hcc-pwfm, MINI-6pp6-55mx-47f6, MINI-6rp8-5fqp-g6mq, MINI-6rwv-cfv3-38xh, MINI-6v8p-7xvh-c4x3, MINI-7393-ccw3-5wp5, MINI-73cc-6jp5-pprw, MINI-7926-62xc-x68j, MINI-7m73-6h3m-rm7h, MINI-7vrr-xfwg-7f89, MINI-8397-2w6f-q96h, MINI-89v5-h4gw-vcq9, MINI-8hf3-fhjr-3c4g, MINI-8m3f-2x4c-2373, MINI-8mg8-8r67-q45x, MINI-8rh7-66q6-c48j, MINI-8v8v-pf7j-rm8x, MINI-8v8v-qw7j-ggg2, MINI-94wx-p9q8-542g, MINI-95wx-mq3v-f969, MINI-96g8-9973-p5hf, MINI-974m-3rh6-wr55, MINI-996f-gmhf-6w62, MINI-997m-xm59-4hp2, MINI-99vf-vfrj-6v5m, MINI-9wrq-rpvm-mqp9, MINI-c3hq-m2fx-gx32, MINI-c473-m43m-8vcf, MINI-c852-29fc-66pv, MINI-ch29-jhv2-3cpg, MINI-chg3-x4f8-m34r, MINI-cmxh-72x2-9hgq, MINI-crcr-c839-7r37, MINI-cvx9-2pvm-5v9h, MINI-f2cr-x74x-p837, MINI-f36x-rv8q-4gw2, MINI-f49v-2pgf-7vj9, MINI-f64w-x7mj-9926, MINI-f84f-qcpx-rh69, MINI-fp7j-q6mr-jmjh, MINI-fxrf-66v6-2654, MINI-g4p7-hcj8-g7vp, MINI-g86f-37xx-4vqf, MINI-gc5g-2x4v-qrp9, MINI-gr6c-235w-4rq6, MINI-gr78-9886-7mj3, MINI-h7cg-5p9c-46f7, MINI-h94r-w9vj-qj59, MINI-hfp2-fgw5-86cx, MINI-hfq3-45cj-c33f, MINI-hp4v-wvvf-cgr6, MINI-hr3p-c54w-ffw2, MINI-hr9m-4prq-p8f3, MINI-j23f-fvr5-5765, MINI-j432-99vg-prg9, MINI-j7m8-w822-rxfw, MINI-j8wf-75vx-5mc5, MINI-j993-g3rw-r23h, MINI-j9f2-r8gx-rg65, MINI-jgx3-4x2f-xmjp, MINI-jh98-7869-9q27, MINI-jq4f-r5cj-xq9v, MINI-jv2r-j6qw-9qhc, MINI-m27r-746h-7vp2, MINI-m767-r6q5-p9ch, MINI-m9xq-h2c3-3m9f, MINI-mh52-qwrr-4ffx, MINI-p3vc-pgpr-cgq7, MINI-p45w-vf74-qjqc, MINI-p4p5-5q6q-j7g6, MINI-p6hr-vrmv-7j6j, MINI-p7cp-vcrp-m2f2, MINI-p9vr-r3rv-3v5j, MINI-pghr-jgv5-4mwp, MINI-qcq6-24vv-3x7w, MINI-qfgp-pwwc-6hfj, MINI-qg7w-r7c7-q8jx, MINI-qhxc-r6fx-w59v, MINI-qjxj-m7gw-qjv2, MINI-qr8f-6c5c-8q7g, MINI-qrxw-8w5q-rvpm, MINI-qwg3-fhx6-85fx, MINI-qwpp-6cf2-8vp5, MINI-qxfj-83f6-6hhw, MINI-r4vh-crph-wm4v, MINI-r5h7-6hp9-r9rw, MINI-r6rw-pjch-qhmg, MINI-r7vv-72xr-fc6w, MINI-rjf3-rm67-r5g9, MINI-rp6x-xj7v-2982, MINI-rqrq-vwjr-w5rm, MINI-rr9g-vh5x-4w9m, MINI-v2m5-qwwj-qj3q, MINI-v45c-7cfv-fjv6, MINI-v8rx-qf5w-jf69, MINI-v9hc-qm2p-xg5q, MINI-vg74-rhq2-vr3p, MINI-w2p5-2h8j-m8r5, MINI-w4q3-53hq-p742, MINI-wcrj-fxm3-8c9f, MINI-wfc3-h9hx-hqmh, MINI-wg26-qm3m-46jf, MINI-wq86-xpc3-rww2, MINI-wq8f-4fgh-7xxr, MINI-wrff-r5jr-rfjw, MINI-x94h-5v25-3c84, MINI-x95x-82vg-whv3, MINI-x9fp-5ghp-cgvr, MINI-x9m3-q7f3-4cqj, MINI-xcjw-4cv9-8hpr, MINI-xvf7-2rq2-5452, ROOT-APP-GOBINARY-CVE-2026-32952, UBUNTU-CVE-2026-32952, openSUSE-SU-2026:10672-1 ## What is CVE-2026-32952? CVE-2026-32952 is a medium-severity denial of service vulnerability in Azure go-ntlmssp, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description go-ntlmssp is a Go package that provides NTLM/Negotiate authentication over HTTP. Prior to version 0.1.1, a malicious NTLM challenge message can causes an slice out of bounds panic, which can crash any Go process using `ntlmssp.Negotiator` as an HTTP transport. Version 0.1.1 patches the issue. Weakness: CWE-190 (Integer Overflow or Wraparound) ## Which versions are affected by CVE-2026-32952? 3 open source packages ship an affected version, including github.com/Azure/go-ntlmssp. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `github.com/Azure/go-ntlmssp` | Go | All versions | 0.1.1 | | `github.com/Azure/go-ntlmssp` | Go | All versions | 0.1.1 | | `github.com/Azure/go-ntlmssp` | Go | All versions | 0.1.1 | | `cmctl` | openSUSE:Tumbleweed | All versions | 2.5.0-1.1 | Products: Microsoft Go-Ntlmssp. ## How do I fix CVE-2026-32952? Upgrade github.com/Azure/go-ntlmssp to 0.1.1 or later. ## Is CVE-2026-32952 being exploited? There is no known exploitation of CVE-2026-32952 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-32952 and fix it if it is affected. What it is: CVE-2026-32952 is a medium-severity denial of service vulnerability in Azure go-ntlmssp, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-32952 in the wild and no public exploit code. Affected packages and fixed versions: - github.com/Azure/go-ntlmssp (Go): affected all versions; fixed in 0.1.1 - github.com/Azure/go-ntlmssp (Go): affected all versions; fixed in 0.1.1 - github.com/Azure/go-ntlmssp (Go): affected all versions; fixed in 0.1.1 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-2026-32952/ (Markdown: https://insights.sbomify.com/CVE-2026-32952/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-32952 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-32952 - OSV: https://osv.dev/vulnerability/CVE-2026-32952 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-32952/ Summaries are generated and may contain mistakes; the official description above is the record.