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CVE-2026-85534— Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initial_window_size shrinks during deferred body read

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libsoup 中发现了一个缺陷。当客户端从非可轮询（non-pollable）输入流发送 HTTP/2 请求体时，库可能会缓冲比当前流控窗口允许范围更多的数据。恶意的 HTTP/2 服务器可以在该缓冲读取仍在进行期间缩小 。随后，客户端会在没有运行时边界检查的情况下，将完整缓冲区复制到较小的 DATA 回调中，这可能导致进程终止或 HTTP/2 会话失败。

CVSS 5.9 · Medium

Affected Version Matrix 5

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
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I. Basic Information for CVE-2026-85534

Vulnerability Information
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Vulnerability Title
Libsoup: libsoup: http/2 client crash in on_data_source_read_callback when settings initial_window_size shrinks during deferred body read
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-85534

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III. Intelligence Information for CVE-2026-85534

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Vendor Advisories for CVE-2026-85534 (1)

Vendor Pages for CVE-2026-85534 (1)

Other References for CVE-2026-85534 (1)

Other References for CVE-2026-85534 (1)

Same Patch Batch · Red Hat · 2026-09-04 · 6 CVEs total

CVE-2026-85197 7.6 HIGH Libsoup: libsoup: heap use-after-free in libsoup http/2 client on_data_read() via goaway d
CVE-2026-81665 7.5 HIGH Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmente
CVE-2026-81666 6.5 MEDIUM Corosync: corosync: integer overflow in check_memb_commit_token_sanity may bypass message
CVE-2026-85769 6.5 MEDIUM Libtpms: libtpms: heap out-of-bounds read in tpm2 state unmarshalling via unchecked block_
CVE-2026-76925 5.8 MEDIUM Flatpak: flatpak: toctou race condition allows symlink redirection

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-617

V. Comments for CVE-2026-85534

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