8000 SECURITY: microvm-rootfs: musl 1.2.6-r3 (CVE-2026-107891, regcomp overflows) by bryan-minimal · Pull Request #993 · gominimal/pkgs · GitHub
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SECURITY: microvm-rootfs: musl 1.2.6-r3 (CVE-2026-107891, regcomp overflows) #993

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Merged
bryan-minimal merged 1 commit into from
Oct 23, 2026
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SECURITY: microvm-rootfs: musl 1.2.6-r3 (CVE-2026-107891, regcomp overflows) #993

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27 changes: 27 additions & 0 deletions packages/microvm-rootfs/build.ncl
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,33 @@ in
"ca-certificates-bundle-20261020-r0"
"d0a573c27d337c369ad3abe3f39f09ffe67b95af23861577a8d134738375176a"
"bb008f6d214b6af7576324659856fb63dc8dcb4373f8345ff706388696f1254d",

# musl itself, same override pattern. alpine-minirootfs-3.24.1 ships musl
# and musl-utils 1.2.6-r2, and every musl through 1.2.6 has the regcomp
# integer overflows of CVE-2026-107891 (undersized heap allocations, then
# out-of-bounds heap writes, from a large or complex pattern;
# https://www.openwall.com/lists/oss-security/2026/10/21/18). Upstream's
# fix ships in 1.2.7; Alpine carries the patch in 1.2.6-r3 (aports
# 3.24-stable main/musl secfixes). Reaching it needs a regex from an
# untrusted source compiled by a guest tool (busybox grep/sed/awk, bash
# `=~`, git); matching untrusted text with a trusted pattern is not enough.
#
# musl owns lib/ld-musl-<arch>.so.1 (the loader and libc in one) and its
# lib/libc.musl-<arch>.so.1 symlink; musl-utils owns ldconfig, getconf,
# getent, iconv and ldd. Neither has an install script, so the overlay
# replaces the base layer's files outright and the apk-db reconcile moves
# both recorded versions to 1.2.6-r3.
#
# DROP THESE once `alpine_release` reaches a minirootfs carrying
# >= 1.2.6-r3.
apk
"musl-1.2.6-r3"
"2e17864102278d9049c3a56f1bceed9e8cf287065617e579325123443daed8a5"
"e142255d0fa397f14318996bc10378093dcc069dc3dd1b6818c8f28a789c21da",
apk
"musl-utils-1.2.6-r3"
"bb460bdc009e88989bd5adca8a7c8298c339cba99da11c6196c818e042fbaf49"
"47263d05842c5e12d01e0369e5b5bea51733323501c00ca21968a5102de137ca",
],

cmd = "./build.sh",
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