# CVE-2026-78663: Double flow control refund on HTTP/2 server streams in net/http

> A malicious client can bypass connection-level flow control limits in Go's HTTP/2 server by triggering double refunds, potentially exhausting resources.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Oct 2026
- **Updated:** 9 Oct 2026
- **Also known as:** AZL-107024, AZL-107051, AZL-107066, AZL-107093, AZL-107120, AZL-107147, AZL-107162, AZL-107168, AZL-107192, AZL-107207, AZL-107219, AZL-107246, AZL-107264, AZL-107276, AZL-107294, AZL-107318, AZL-107330, AZL-107363, AZL-107366, AZL-107384, AZL-107412, AZL-107427, AZL-107508, AZL-107523, AZL-107541, AZL-107567, AZL-107592, AZL-107616, AZL-107628, AZL-107643, AZL-107667, AZL-107679, AZL-107712, AZL-107724, AZL-107736, AZL-107760, AZL-107772, AZL-107796, AZL-107814, AZL-107829, AZL-107847, AZL-107874, AZL-107895, AZL-107904, AZL-107937, AZL-108216, AZL-108233, AZL-108360, AZL-108465, AZL-108552, BELL-CVE-2026-78663, BIT-golang-2026-78663, CLEANSTART-2026-EN61439, CLEANSTART-2026-IC52638, CLEANSTART-2026-IW19449, CLEANSTART-2026-NF66444, CLEANSTART-2026-OB67421, CLEANSTART-2026-TS76124, CLEANSTART-2026-UE71064, CLEANSTART-2026-VR65122, CLEANSTART-2026-WY73031, CLEANSTART-2026-XA13767, CLEANSTART-2026-XD86126, CLEANSTART-2026-ZY41765, DEBIAN-CVE-2026-78663, ECHO-4bce-e3cc-5d4b, GO-2026-6612, MINI-2225-g68f-4334, MINI-224g-p94m-45wx, MINI-2276-4pff-p54w, MINI-233g-rvvv-8xq5, MINI-23fh-vrhc-mx6p, MINI-23h9-v48q-qj3j, MINI-243g-f3v2-v2qw, MINI-259q-82ph-3p99, MINI-25gg-wp72-3hcx, MINI-25r9-q9j6-343p, MINI-25xc-pvm6-f4qc, MINI-262j-97vr-r6mr, MINI-2677-wcw6-rh62, MINI-26pf-244x-5rhh, MINI-279j-m5gg-gq52, MINI-28g3-5xcc-c672, MINI-28rp-5vrj-pvcx, MINI-295m-pqcf-4pc6, MINI-2c6h-fcp4-gjhr, MINI-2cfc-wjf7-wj7j, MINI-2f2r-8j4p-g97c, MINI-2f34-9rpr-x5hw, MINI-2fp5-99q5-vccq, MINI-2g6j-24x3-4mww, MINI-2gjg-3f8j-837g, MINI-2grg-h5xw-68mw, MINI-2hgf-m7qm-pqrf, MINI-2hww-8v47-3c87, MINI-2jqv-v2rh-gf2f, MINI-2mpw-9f59-grgx, MINI-2p52-vc79-mj5r, MINI-2q7f-fhw7-9q6q, MINI-2qp4-628p-xwxm, MINI-2r58-q3q5-83wm, MINI-2r87-hwq3-wq55, MINI-2v2q-hfpc-w5c5, MINI-2v73-hrw8-g2rq, MINI-2vr7-6cc4-hcrg, MINI-2vrm-7vp9-8pp7, MINI-2vv9-fw58-6266, MINI-2w8x-w23q-6p8x, MINI-2wg8-mrf7-chjx, MINI-2wmm-f684-43v6, MINI-2wrp-r5r6-c22j, MINI-2x6p-462m-mr84, MINI-34c4-2h6f-m4q8, MINI-34p9-fv95-8m44, MINI-3537-3vvj-hc99, MINI-3577-79pq-48mw, MINI-359q-p2ph-7rqg, MINI-366g-r866-pwmw, MINI-36h8-29v5-74r5, MINI-376x-x66j-3239, MINI-378r-h29v-49xh, MINI-37hj-9pxm-wqm3, MINI-3898-49mp-h5qx, MINI-38hm-4vc9-phfh, MINI-38rj-vr9g-jv6v, MINI-38vp-2982-87p8, MINI-38xx-cj4h-3cvr, MINI-3928-rpp9-gvp4, MINI-3989-mw3h-8v35, MINI-39gr-5p8p-mg9h, MINI-3cfh-fv5q-496h, MINI-3cg7-vhpw-wwxf, MINI-3ch2-9pjg-7jj7, MINI-3chx-xmjp-gwhc, MINI-3cvc-cwcp-vgwr, MINI-3cwj-3w8q-j5m3, MINI-3f4h-h4gr-4j84, MINI-3fmm-38v8-wcfc, MINI-3fmw-7xqg-492w, MINI-3fw3-x7xx-4j4m, MINI-3g3q-5jgg-5g7r, MINI-3g6w-prmg-jfr8, MINI-3ghp-h54x-pq6p, MINI-3gwg-gxf8-m4pg, MINI-3hjf-cxgj-34g3, MINI-3j22-r56h-gpp5, MINI-3j9r-xhmx-96pj, MINI-3jr5-vv34-8j54, MINI-3jvx-5rh9-c6x3, MINI-3jw7-pch9-5x22, MINI-3m3c-qpjc-2gjv, MINI-3mcc-25cg-2q3f, MINI-3mgr-gm38-m7cx, MINI-3mmv-9x89-9wfq, MINI-3mx3-fvmf-w63c, MINI-3p69-gq8c-7cpv, MINI-3q3m-m6f8-2rhf, MINI-3r4q-9xrq-jcjm, MINI-3rpm-h2r3-82vx, MINI-3v7r-w96f-f82v, MINI-3v82-2587-3rhj, MINI-3w8x-9j9f-f48j, MINI-3wf7-x853-qrjw, MINI-3www-v6xq-875g, MINI-42gm-m46c-w346, MINI-42px-m8jx-mwxq, MINI-42qj-45vv-7hgp, MINI-42rj-2fh4-5gfq, MINI-435w-3hhr-j9w9, MINI-43rx-93jm-6x89, MINI-445v-7g8v-5g43, MINI-44vr-4v4w-rmpx, MINI-455h-jq78-r3qj, MINI-459r-8257-mgpm, MINI-463v-vr62-m776, MINI-46cg-9qph-v6xr, MINI-4776-cjp2-46v5, MINI-4789-2hxg-hhwv, MINI-47x5-gcj6-4w5w, MINI-485j-gxmw-76p7, MINI-4998-pjc8-cfrh, MINI-49c9-6wrj-2jcq, MINI-49vh-2xj3-j4w7, MINI-4c4p-7468-4hmg, MINI-4c87-32p2-xffr, MINI-4g3m-vxcc-m474, MINI-4gjf-wm45-4rpm, MINI-4gp6-rpcr-mrr6, MINI-4hcm-f49v-mh42, MINI-4jp9-9ghr-6wcm, MINI-4jpx-rpj8-6g23, MINI-4jrm-vh5h-jrqv, MINI-4m8f-7xcf-rrpg, MINI-4mjg-q388-9j69, MINI-4mrq-8x5x-mx98, MINI-4mvp-cf4j-jh7w, MINI-4mxq-w5q6-g25m, MINI-4p25-cq8h-w7cv, MINI-4pq4-p858-f4hc, MINI-4pxv-4fpm-cm5c, MINI-4qhg-hhvw-7qj2, MINI-4qxf-r326-mghf, MINI-4r42-cmjw-ghq3, MINI-4r67-qrgq-c482, MINI-4rmj-76c9-9qmf, MINI-4rv4-f3mf-535w, MINI-4vph-pgqf-c72c, MINI-4w5x-m777-22h7, MINI-4wh9-m2rr-cpvv, MINI-4xj9-j8jq-j5qc, MINI-52g6-8pqp-qhcf, MINI-52g8-p2r5-3jqm, MINI-52rc-37fw-hr54, MINI-532x-5c8j-vgxq, MINI-53x3-9g55-x432, MINI-5475-8rrf-vf6j, MINI-54j5-h9v7-m5qc, MINI-5568-32v4-qfph, MINI-56cq-qrq3-jxq8, MINI-56p3-cm2w-7jff, MINI-56rx-h867-58gv, MINI-57cx-hjh3-4g94, MINI-5823-r6jc-qgwr, MINI-589g-9hrc-9wrp, MINI-58c7-jmvj-jr6m, MINI-58j7-35pf-2hj7, MINI-59rq-pp7h-3g49, MINI-5cjm-9jcv-92cj, MINI-5f22-frq4-r3jg, MINI-5f8m-h6r8-7xqj, MINI-5fh2-9q32-4p9r, MINI-5fpm-6chp-64vq, MINI-5fr3-6gv8-ppvc, MINI-5gc8-pfv5-rcp7, MINI-5gfw-vmm7-wqm4, MINI-5h9j-9c7h-r93c, MINI-5hxc-h4g9-jhm7, MINI-5j4h-c3x8-f69j, MINI-5j72-8xrf-qcm8, MINI-5jw5-3cxj-rc3w, MINI-5mq3-qgp8-cxc7, MINI-5q2g-g5rx-f2vm, MINI-5qjv-vqg6-p75c, MINI-5r53-h8xx-4hc2, MINI-5r8w-fh78-jf79, MINI-5vw9-8x6v-67rv, MINI-5wj6-rxw6-2p2f, MINI-5x55-cc47-jw2v, MINI-5x62-frjr-c9vc, MINI-5x8c-32fq-vj9c, MINI-5xp6-jqch-c7hw, MINI-5xwj-2jqg-rhj3, MINI-5xxc-jh9c-c6c9, MINI-62gm-h67x-g5v2, MINI-62h4-v6w8-qmv3, MINI-62qx-f259-h8hr, MINI-62v2-536r-8gwv, MINI-63wf-28j7-gf7h, MINI-6443-7qvr-9gj6, MINI-6499-qx85-q59g, MINI-64c4-wwj2-86x3, MINI-6552-mh7r-pf2p, MINI-65rp-wgfw-cg9h, MINI-665g-75g6-92v5, MINI-66mq-93mh-v3h3, MINI-66xf-8vwg-jq8r, MINI-676x-777h-4w48, MINI-689m-5q3f-qm65, MINI-68cg-26w2-fv5f, MINI-68p8-j8x9-59w7, MINI-68r4-hq7v-fh8c, MINI-6963-6vr2-55mq, MINI-6985-hf7p-gxqg, MINI-69c4-mm7p-h6g5, MINI-6cjh-h33h-m473, MINI-6fgj-c8w5-cvgg, MINI-6g2x-gwhh-wjvx, MINI-6gmq-q8cm-rrx7, MINI-6hp7-f93w-r25h, MINI-6j2m-45hv-534j, MINI-6jwp-r4fj-pqr8, MINI-6m3q-8grp-h2x6, MINI-6m97-q7r2-g4qv, MINI-6mgh-pv2w-968h, MINI-6pxh-362w-h4jf, MINI-6qpq-fvvp-p8w4, MINI-6r88-6886-2vx7, MINI-6r9p-q9px-vqq3, MINI-6rcr-66pw-v347, MINI-6rh3-8p2j-c7q3, MINI-6rxc-5854-76j2, MINI-6v65-72h8-r8mm, MINI-6w42-p2f3-m566, MINI-6w83-r7hc-m833, MINI-6w9m-rxhm-8jq9, MINI-6wjh-6g77-h5mv, MINI-6wp9-8984-g9r4, MINI-6wq9-88m6-6rv5, MINI-6wrp-vwf4-m67r, MINI-6wv6-pqjp-h579, MINI-6xm5-9264-8m7m, MINI-6xmw-p26j-mq9w, MINI-6xqx-mqv8-5rm5, MINI-7283-p3cc-wfjw, MINI-74j7-hq75-45xg, MINI-74rx-f58g-pj2w, MINI-754m-62xg-p5mh, MINI-755f-4pv5-p2jw, MINI-75fj-w2q3-r9v6, MINI-75w7-j365-3vwc, MINI-7669-pc3m-4f4w, MINI-76j5-c6fg-ww6v, MINI-772x-jh92-9mw5, MINI-773p-j32h-vg36, MINI-77j5-xjmm-5c72, MINI-78gv-f7qc-gqxr, MINI-793p-qj58-wpm6, MINI-7958-74c5-8phc, MINI-79hg-r47h-3v56, MINI-79pj-pf3g-42hf, MINI-7cwh-gg7r-c2g6, MINI-7cxg-cvrh-272m, MINI-7fhr-4f23-vjh8, MINI-7g86-f222-qqc4, MINI-7gm6-gh3g-q9jp, MINI-7gm8-p5q9-vjgc, MINI-7gr6-2hqr-2h6r, MINI-7gvj-cw32-cxxp, MINI-7h3r-9p7m-x988, MINI-7hjv-xwhg-9rrm, MINI-7j26-fcc2-x6hp, MINI-7jp6-c3hm-mcvw, MINI-7mmp-rp3x-8x96, MINI-7mp9-g2jc-gvv5, MINI-7mrp-8qh4-3q8v, MINI-7mwq-f65m-qw84, MINI-7p83-qfhg-qrrj, MINI-7pm9-f245-7mqq, MINI-7pv5-g8g8-43rx, MINI-7q39-8jv7-jqxh, MINI-7qrp-vpp9-6pmc, MINI-7r43-799j-mvhx, MINI-7r44-9c4r-8qvf, MINI-7rjf-94j3-p2vj, MINI-7rp5-c5r9-php9, MINI-7v7j-8f3m-wxgf, MINI-7w4w-32rv-v2xp, MINI-7wmf-h6j6-6p57, MINI-7xp6-6642-x9qp, MINI-7xpm-232r-pc3c, MINI-7xx4-32ch-42fp, MINI-822q-j6w4-hv3h, MINI-82fm-6jmx-5p9v, MINI-8324-p9qq-h9xg, MINI-835m-4jq3-85f4, MINI-83mf-95w3-74h8, MINI-83v9-4xjm-h59x, MINI-8459-ccv5-p825, MINI-8469-j4vq-x7ww, MINI-8537-wfq3-p2m3, MINI-8579-6hgc-28jv, MINI-85qv-gm44-jqj2, MINI-85w4-xmpq-g3h2, MINI-868w-48j2-5q57, MINI-86mc-69pr-hxv8, MINI-872g-8v9p-jr96, MINI-8739-v6q2-w6hw, MINI-87jm-5jj4-hx7f, MINI-87mp-qjr6-q3v6, MINI-87pg-c658-3v3m, MINI-87q7-69xc-2cr8, MINI-88gw-5wmj-5rmp, MINI-8938-9vwv-8gfg, MINI-89xp-9388-qgc8, MINI-8c3p-7fmj-xmgf, MINI-8ch5-8g5q-7g39, MINI-8cj6-c4qr-x388, MINI-8cjc-5cff-g4hv, MINI-8fcj-fjh2-xxxr, MINI-8fmh-w482-vqwq, MINI-8fwr-j56p-ch4f, MINI-8g24-44fm-473f, MINI-8g3x-fg9r-4gr9, MINI-8g8x-3qm2-jhcm, MINI-8gq2-4c5m-2qf6, MINI-8h56-cwpm-m7qg, MINI-8hjx-229r-x6gx, MINI-8hpw-883r-w726, MINI-8jrw-2hvc-c4gj, MINI-8m49-666f-xjx8, MINI-8mpq-2vq4-35q2, MINI-8p3m-9r7r-hgqv, MINI-8p6r-9jr6-xcx4, MINI-8p9j-4hw2-pxqw, MINI-8prr-m446-fxmw, 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MINI-rj6f-cq9g-pjv7, MINI-rj7g-qvh7-x5ww, MINI-rjh7-7vfj-2w9r, MINI-rmf2-w896-ccfx, MINI-rp4f-r54q-4rv5, MINI-rp6j-g2x2-qm3m, MINI-rq4w-4xpg-pp44, MINI-rq4w-h6pj-cc5x, MINI-rqfj-8m63-m63w, MINI-rqxv-wqcw-56h7, MINI-rr62-jqhj-2pfc, MINI-rrfj-g326-h45j, MINI-rrjc-pfm8-q64j, MINI-rrp3-cwqh-7mg6, MINI-rrwj-mjxp-5whc, MINI-rvv7-pw46-wh77, MINI-rvwj-p233-g795, MINI-rw8r-cxxf-p4gv, MINI-rw8v-9q8v-835m, MINI-rwgf-mq42-pgqr, MINI-rx2c-x483-w37f, MINI-rx52-96m9-5h2v, MINI-rxxc-q7gq-3r2x, MINI-v2q3-mjh3-29f4, MINI-v2wh-vxm4-qjm5, MINI-v38h-p33c-8vch, MINI-v4gj-pwrw-cpqf, MINI-v4hv-5j25-m4x4, MINI-v52w-wj7m-c9vf, MINI-v5gg-3gxm-6rfc, MINI-v63j-c87h-q7fw, MINI-v6qw-6c74-4gq5, MINI-v6rv-qcc5-32f6, MINI-v6xv-8329-gxp4, MINI-v73h-9qg2-93wf, MINI-v774-37hf-qf56, MINI-v79j-8jxj-fjgp, MINI-v7gh-x5xh-2mw5, MINI-v7vg-x9c3-rcf8, MINI-v8j9-2vpp-x797, MINI-v8m4-f82c-fj2x, MINI-v8wj-g667-cpj6, MINI-v98f-8qqh-m54c, MINI-v9jq-g45v-gm8h, MINI-v9jq-rpm6-pvm9, MINI-vcp8-3622-76mc, MINI-vfg4-f4v5-wm58, MINI-vfr5-pg6j-9chg, MINI-vfvr-w6xc-52c9, MINI-vh68-w35g-3hmq, MINI-vjc3-6r97-pfhq, MINI-vjc7-q4w9-3g5m, MINI-vjfj-2937-rwg7, MINI-vjgc-pwcr-5cg7, MINI-vjvj-r854-99ff, MINI-vjwj-q5fc-ff25, MINI-vm3v-3f59-f9g6, MINI-vm57-48m8-7656, MINI-vmc5-8vv5-fj2w, MINI-vmmq-32vv-g6vr, MINI-vmw4-pg5c-qjpm, MINI-vpfq-gj4f-9fcg, MINI-vpq6-xj94-qx6j, MINI-vqj6-7hvg-g6xw, MINI-vqr8-v7xr-67j2, MINI-vrfv-q8xf-4w2g, MINI-vrg5-3m33-hrq4, MINI-vvmh-qqv6-hr6c, MINI-vvrg-hc4r-jvc8, MINI-vvrv-f76r-vj44, MINI-vwf7-x6jq-7423, MINI-vwv3-vf68-3gc9, MINI-vx66-3267-4356, MINI-vxc9-g8fm-fw6r, MINI-vxfv-25cr-cpmj, MINI-vxwg-9gjf-c4wm, MINI-vxxr-24hc-c493, MINI-w233-r3q9-xqr6, MINI-w24j-f4ff-7xpg, MINI-w2rg-42qf-r3p7, MINI-w2v6-pcrh-mcp5, MINI-w33m-2fv5-3p48, MINI-w492-8m64-h8q8, MINI-w4g3-g834-m4fx, MINI-w56c-qfm2-frh5, MINI-w57c-39m9-c542, MINI-w59v-7q2m-2q22, MINI-w5g4-c2q9-3w4g, MINI-w5gw-4gvw-6pp7, MINI-w5hq-9mhf-v37v, MINI-w6p2-vr68-w86j, MINI-w76j-7h89-c7jw, MINI-w8fj-xj7f-f3xq, MINI-w8g9-ccc5-6h6x, MINI-w8p3-wm68-jfc3, MINI-w93v-gcxw-q6r7, MINI-w9hh-3gm7-pmpj, MINI-w9ph-pchr-x2cg, MINI-wfpc-h785-w453, MINI-wfpr-34v4-8c5p, MINI-wfrw-gq3c-wmxg, MINI-wg4q-vr2x-jh97, MINI-wgg3-66hw-hjpx, MINI-wgj6-c7h7-c3xc, MINI-wgx9-wq45-963r, MINI-wj4m-mr7x-c54g, MINI-wj5h-gxfp-gw5m, MINI-wjfv-r797-6qpc, MINI-wjpx-r83g-f7q8, MINI-wjq8-374v-xrf9, MINI-wm7w-4rwv-j34w, MINI-wmj2-chqg-6v3j, MINI-wmv7-xrwh-g6pg, MINI-wpq9-hc6g-35jh, MINI-wq74-2jpw-rcj7, MINI-wr2m-px76-m6w9, MINI-wr6r-x2rh-4h54, MINI-wrjh-px56-8m7h, MINI-wvcc-2q4c-3hr4, MINI-wvp2-wp38-4jhg, MINI-wvpm-9v53-w97j, MINI-wvvq-r69w-x3mw, MINI-wwc7-3pvc-75pv, MINI-wwhc-q984-jvr8, MINI-wx44-jpq4-x92f, MINI-wx7x-f9fr-r8ww, MINI-x24f-7rvg-cqfv, MINI-x259-8mv7-c87x, MINI-x292-9mfg-x5fx, MINI-x2cm-vc49-jr36, MINI-x2cp-5q24-7954, MINI-x2jg-rxcm-qrfh, MINI-x39r-xmp3-45x3, MINI-x3xq-mvcp-2qm9, MINI-x47q-c3f9-fpx3, MINI-x557-xfg2-wh8r, MINI-x576-r594-gfrx, MINI-x5gm-rc75-h62x, MINI-x5gx-x658-66mp, MINI-x5vv-9vjg-mw4w, MINI-x5wm-mcc2-c6v5, MINI-x5ww-v82h-cc45, MINI-x662-jv8p-qw38, MINI-x6cq-f692-5qq8, MINI-x6p8-gr26-gmr5, MINI-x6vc-q9xj-6964, MINI-x724-xfhh-99xp, MINI-x7h4-534g-6f44, MINI-x7hr-4496-crcq, MINI-x7v6-5q23-2gmv, MINI-x7vw-gvf5-93jf, MINI-x84x-fwg3-c5ww, MINI-x85w-7pc3-88gf, MINI-x8p8-php5-w5x4, MINI-x98m-rfqr-j8h7, MINI-x9p2-hfqg-5cc6, MINI-x9q6-fc7j-2g4j, MINI-x9qg-jrg5-hgwh, MINI-x9wv-ghmg-29c9, MINI-xc3h-whfq-mm8c, MINI-xc5h-9x5f-vf25, MINI-xc7v-xrww-3qmg, MINI-xch8-3mrj-23c5, MINI-xf95-49vg-664m, MINI-xffw-wrgw-772x, MINI-xfxp-wvpv-58p7, MINI-xg99-3hg5-g278, MINI-xgcv-hrjh-j8j3, MINI-xgj8-mw3r-3rcj, MINI-xgmq-9947-r7rq, MINI-xgqh-xcc8-jrv8, MINI-xgqr-vrw7-mxv7, MINI-xgw9-4xqc-48cr, MINI-xhh3-wprg-fgq8, MINI-xhv9-j44f-frw6, MINI-xjj2-966x-jh4v, MINI-xjvr-qwq6-9399, MINI-xm6q-j99m-wc69, MINI-xmhv-fq5r-x2m7, MINI-xmjj-hj8v-f66p, MINI-xpc6-ffg9-r6mx, MINI-xpr8-wc3w-4763, MINI-xpvg-q6jg-h7vc, MINI-xq3q-xxmg-79q9, MINI-xq5c-c7g7-ff42, MINI-xq89-3frj-g67q, MINI-xqh8-ghf5-2hmf, MINI-xrmg-crcf-f757, MINI-xvg2-j32m-57mq, MINI-xvxq-fp9f-qg54, MINI-xwgm-g2cg-663c, MINI-xxcr-2jvx-q2qq, ROOT-APP-GOBINARY-CVE-2026-78663, UBUNTU-CVE-2026-78663, openSUSE-SU-2026:12293-1

## What is CVE-2026-78663?

CVE-2026-78663 is a critical vulnerability in golang.org/x/net/http2, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the concurrent stream limit and stream-level flow control.

Weakness: CWE-675 (Multiple Operations on Resource in Single-Operation Context)

## Which versions are affected by CVE-2026-78663?

4 open source packages ship an affected version, including stdlib, golang and golang.org/x/net.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `stdlib` | Go | All versions | 1.26.9 |
| `stdlib` | Go | From 1.27.0-0 | 1.27.2 |
| `golang` | Bitnami | All versions | 1.26.9, 1.27.2 |
| `golang.org/x/net` | Go | All versions | 0.60.0 |
| `hugo` | openSUSE:Tumbleweed | All versions | 0.168.0-3.1 |

## How do I fix CVE-2026-78663?

Upgrade stdlib to a fixed version for your release line: 1.26.9 or 1.27.2.

## Is CVE-2026-78663 being exploited?

There is no known exploitation of CVE-2026-78663 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78663 and fix it if it is affected.

What it is: CVE-2026-78663 is a critical vulnerability in golang.org/x/net/http2, published on 8 Oct 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-2026-78663 in the wild and no public exploit code.

Affected packages and fixed versions:
- stdlib (Go): affected all versions; fixed in 1.26.9
- stdlib (Go): affected from 1.27.0-0; fixed in 1.27.2
- golang (Bitnami): affected all versions; fixed in 1.26.9, 1.27.2
- golang.org/x/net (Go): affected all versions; fixed in 0.60.0

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-2026-78663/ (Markdown: https://insights.sbomify.com/CVE-2026-78663/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78663
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78663
- OSV: https://osv.dev/vulnerability/CVE-2026-78663

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-78663/
Summaries are generated and may contain mistakes; the official description above is the record.