# CVE-2026-1229: Incorrect calculation in CIRCL secp384r1 CombinedMult > Incorrect calculation in CIRCL secp384r1 CombinedMult produces wrong values for specific inputs, though ECDH and ECDSA remain unaffected. - **Severity:** Low 2.9 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/S:N/AU:Y/U:Amber`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 24 Feb 2026 - **Updated:** 24 Feb 2026 - **Also known as:** CLEANSTART-2026-LG65775, CLEANSTART-2026-PC68817, CLEANSTART-2026-PN12156, CLEANSTART-2026-VP63638, GHSA-q9hv-hpm4-hj6x, GO-2026-4550, MINI-2669-w7vj-2696, MINI-288h-fhvm-c4f4, MINI-2frf-gcrh-jxx7, MINI-2mj7-m326-88hw, MINI-2w93-jc2w-cwvj, MINI-343g-g8p7-8gx9, MINI-3763-fgjc-2c22, MINI-3g96-x36w-m4gq, MINI-3ph3-xm9m-9vqw, MINI-3qmq-wp42-3qvp, MINI-3rvf-573p-fwqw, MINI-3xqh-64jx-w5hv, MINI-4273-3726-pvh4, MINI-452m-v6r6-269j, MINI-467h-56p4-f9rm, MINI-4g6q-mv66-pxx4, MINI-4v94-qvm6-qqw4, MINI-52xx-3w86-p5h2, MINI-53wv-57v6-cqfp, MINI-58j2-f9rq-rqw3, MINI-58rh-534h-vw8h, MINI-596m-jmf9-rjgh, MINI-5hrq-3mc9-hwpc, MINI-622c-49xf-vcg6, MINI-636c-w56x-9qpv, MINI-66v4-m7gg-fp29, MINI-6cr5-5r3j-79v7, MINI-6gj2-9c5p-xvpg, MINI-6mjq-vhxh-gv45, MINI-6pr8-9gfj-45fg, MINI-73w2-h95v-373p, MINI-74pr-wx9q-j826, MINI-74vr-wr77-c5mr, MINI-75w6-xp6v-hvw8, MINI-766c-947f-36xw, MINI-7845-2882-jwq5, MINI-8386-8h39-x935, MINI-8779-xm5v-m97x, MINI-89vc-5j92-h7x6, MINI-8cm4-868m-hjw7, MINI-8fmj-6775-7rrh, MINI-8h99-wg3x-6557, MINI-8mrx-jq8m-w7w2, MINI-8qpw-3jhh-h358, MINI-9cf4-2q4w-v9xg, MINI-9cgv-q3v6-vr4m, MINI-9f2c-wq5p-x84c, MINI-9fx5-42f2-vf6w, MINI-9hff-mc25-3gc9, MINI-9p8x-5h2p-4pr4, MINI-9qhh-5wcx-rf7g, MINI-9vx9-63r6-mpmm, MINI-9wxq-8823-hp99, MINI-c6hv-7v23-32p6, MINI-c986-rx4q-jx9w, MINI-cr9h-3928-7fhv, MINI-cwr2-mv4x-6x4p, MINI-cwv9-p95v-hhxm, MINI-f4fr-92pp-4q3g, MINI-fqh6-g7w5-g25c, MINI-g4qh-hh72-cf9j, MINI-g4rq-wvv2-45rv, MINI-g5r7-qx6r-4g3v, MINI-g6cp-7f9g-jqrv, MINI-gc7f-pmw8-8qfp, MINI-gh5g-275x-2w5j, MINI-gjm3-c2j2-j62m, MINI-gmc6-6454-48pq, MINI-gpmr-5v8c-33qx, MINI-h6q9-8ww2-3hmj, MINI-h8cv-w6vx-8chc, MINI-hg87-26cv-h73h, MINI-hmjh-2rcc-hmf4, MINI-hpqr-6mx2-9x8p, MINI-j44h-qr52-97x8, MINI-j5mh-3jpr-4247, MINI-jcfx-q2xc-2gx4, MINI-jcq8-vq97-fxf6, MINI-jhmj-r7mg-276p, MINI-jmf3-frmm-5wv9, MINI-jmqc-pj83-5jw2, MINI-jx5j-h42m-pg8w, MINI-m3jq-cxw2-4qwh, MINI-m67q-97cr-9x78, MINI-m99x-2m3w-6f88, MINI-mc2f-79gw-hg8w, MINI-mcm8-2hvw-q9xm, MINI-mhq9-365j-vh36, MINI-mprq-qfg6-r39q, MINI-p466-jpq5-wxww, MINI-pp92-7xx2-5c37, MINI-prpx-x53q-q2m4, MINI-q4hv-5c5r-7v82, MINI-q734-m485-fw43, MINI-q7pv-hhfw-v3gg, MINI-q8xf-2q7w-p8h7, MINI-qf8q-mq2f-rhh8, MINI-qjp6-hvf4-q26r, MINI-qx9p-2hhm-4m6p, MINI-qxxw-f78q-89rj, MINI-r4rq-fjx3-3rv9, MINI-r8w4-hwh4-vrm6, MINI-rcrj-8cr8-wp67, MINI-rm6w-f56j-v82w, MINI-rm88-p323-cf5h, MINI-rpww-x85c-wrvh, MINI-rq7v-ph85-grcg, MINI-rrjw-4hwm-xx5f, MINI-rw54-xww9-j232, MINI-v6vg-ggjj-g6gf, MINI-v875-4q9g-gp3c, MINI-v989-9prj-jm7f, MINI-vgqj-ff44-32fg, MINI-vgr7-h4m9-fg75, MINI-vh63-r6w5-q6c7, MINI-vxh8-42v9-f95x, MINI-w2fm-rgq2-433q, MINI-w8f7-4f57-w4p7, MINI-w9h7-vq8m-m6q3, MINI-wcmw-mrqw-qv32, MINI-wrrr-4rq7-g8c2, MINI-x8c5-j4p8-66xq, MINI-xjc4-vx8c-hmj6, MINI-xmcc-wvh9-vj32, MINI-xwc3-6fr9-h8cx, MINI-xxwj-vgwm-h4c3, ROOT-APP-GOBINARY-CVE-2026-1229, UBUNTU-CVE-2026-1229, openSUSE-SU-2026:10486-1, openSUSE-SU-2026:10995-1, openSUSE-SU-2026:20948-1 ## What is CVE-2026-1229? CVE-2026-1229 is a low-severity vulnerability in Cloudflare CIRCL, published on 24 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas. ECDH and ECDSA signing relying on this curve are not affected. The bug was fixed in v1.6.3 https://github.com/cloudflare/circl/releases/tag/v1.6.3 . Weakness: CWE-682 (Incorrect Calculation) ## Which versions are affected by CVE-2026-1229? 3 open source packages ship an affected version, including github.com/cloudflare/circl. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `github.com/cloudflare/circl` | Go | All versions | 1.6.3 | | `github.com/cloudflare/circl` | Go | All versions | 1.6.3 | | `github.com/cloudflare/circl` | Go | All versions | 1.6.3 | | `enc` | openSUSE:Leap 16.0 | All versions | 1.1.5-bp160.1.1 | | `amazon-ssm-agent` | openSUSE:Tumbleweed | All versions | 3.3.4121.0-1.1 | | `enc` | openSUSE:Tumbleweed | All versions | 1.1.5-2.1 | Products: Cloudflare Circl. ## How do I fix CVE-2026-1229? Upgrade github.com/cloudflare/circl to 1.6.3 or later. ## Is CVE-2026-1229 being exploited? There is no known exploitation of CVE-2026-1229 in the wild and no public exploit code. ## Other vulnerabilities in Cloudflare CIRCL - [CVE-2023-1732](https://insights.sbomify.com/CVE-2023-1732/): Improper random reading in CIRCL (medium 5.3) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-1229 and fix it if it is affected. What it is: CVE-2026-1229 is a low-severity vulnerability in Cloudflare CIRCL, published on 24 Feb 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-2026-1229 in the wild and no public exploit code. Affected packages and fixed versions: - github.com/cloudflare/circl (Go): affected all versions; fixed in 1.6.3 - github.com/cloudflare/circl (Go): affected all versions; fixed in 1.6.3 - github.com/cloudflare/circl (Go): affected all versions; fixed in 1.6.3 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-2026-1229/ (Markdown: https://insights.sbomify.com/CVE-2026-1229/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1229 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1229 - OSV: https://osv.dev/vulnerability/CVE-2026-1229 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-1229/ Summaries are generated and may contain mistakes; the official description above is the record.