{"id":"OESA-2026-3690","summary":"libsoup security update","details":"libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.\r\n\r\nSecurity Fix(es):\n\nA heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mismatch between the caller and soup_headers_parse() can cause the length parameter to be incorrectly truncated, leading to a heap buffer over-read. A remote attacker could use this flaw to crash an application using libsoup or potentially disclose heap memory contents.(CVE-2026-12548)\n\nThe fix for CVE-2026-2443 was regressed by a subsequent rework commit that replaced specific overflow checks with a general signed comparison. When a client sends a Range request with a suffix length exceeding the content size, the resulting negative start value is not properly clamped, leading to malformed HTTP 206 responses and log flooding.(CVE-2026-12549)\n\nA flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.(CVE-2026-66338)\n\nA flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() comparator in soup-message-headers.c truncates a 64-bit subtraction result to 32-bit int, flipping the sign for range offsets differing by more than INT_MAX. This causes silent omission of requested byte ranges from HTTP 206 Partial Content responses on resources larger than approximately 2 GB.(CVE-2026-77014)\n\nAn algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the CVE-2025-32907 fix. CVE-2025-32907 addressed memory amplification when a client repeated the same range many times in a single Range header. Commit 9bb92f7a corrected merge correctness in soup_message_headers_get_ranges_internal() in libsoup/soup-message-headers.c, but the coalescing loop still removes merged ranges using g_array_remove_index() for each coalesced element. Because GArray is contiguous, each mid-array removal performs an O(N) memmove. When many identical satisfiable ranges are supplied (for example bytes=0-0 repeated thousands of times), the loop performs O(N²) work coalescing them into a single range. The vulnerable path is reachable server-side from handle_partial_get() in libsoup/server/http1/soup-server-message-io-http1.c when a SoupServer handler returns HTTP 200 with a non-empty body. No authentication is required. The number of ranges is bounded only by the maximum request header size (~100 KiB), allowing roughly 25,000 ranges per request. This is a CPU exhaustion / availability issue only. No memory corruption or information disclosure occurs.(CVE-2026-77680)","modified":"2026-09-05T15:16:38.127170704Z","published":"2026-09-05T15:03:58Z","upstream":["CVE-2026-12548","CVE-2026-12549","CVE-2026-66338","CVE-2026-77014","CVE-2026-77680"],"database_specific":{"severity":"Medium"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3690"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12548"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12549"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66338"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77014"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77680"}],"affected":[{"package":{"name":"libsoup","ecosystem":"openEuler:22.03-LTS-SP4","purl":"pkg:rpm/openEuler/libsoup&distro=openEuler-22.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.74.2-22.oe2203sp4"}]}],"ecosystem_specific":{"noarch":["libsoup-help-2.74.2-22.oe2203sp4.noarch.rpm"],"src":["libsoup-2.74.2-22.oe2203sp4.src.rpm"],"x86_64":["libsoup-2.74.2-22.oe2203sp4.x86_64.rpm","libsoup-debuginfo-2.74.2-22.oe2203sp4.x86_64.rpm","libsoup-debugsource-2.74.2-22.oe2203sp4.x86_64.rpm","libsoup-devel-2.74.2-22.oe2203sp4.x86_64.rpm"],"aarch64":["libsoup-2.74.2-22.oe2203sp4.aarch64.rpm","libsoup-debuginfo-2.74.2-22.oe2203sp4.aarch64.rpm","libsoup-debugsource-2.74.2-22.oe2203sp4.aarch64.rpm","libsoup-devel-2.74.2-22.oe2203sp4.aarch64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-3690.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"}]}