- Fix uint16_t overflow in FCGI demux record length (CVE-2026-55203)
Resolves: RHEL-211066 - Fix NULL pointer dereference in hpack_dht_insert() (CVE-2026-55204) Resolves: RHEL-211074
This commit is contained in:
Oyvind Albrigtsen
parent
66b59faded
commit
c9f4b4f571
@ -0,0 +1,37 @@
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From 5985276735777634d8c85f1d73bb7764aab0d6dd Mon Sep 17 00:00:00 2001
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From: Tristan Madani <tristan@talencesecurity.com>
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Date: Tue, 16 Jun 2026 10:46:03 +0200
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Subject: [PATCH] BUG/MEDIUM: mux-fcgi: fix uint16_t overflow in drl += drp
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The FCGI demux record length field (drl) is uint16_t. In the
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ignore_record path, the expression "fconn->drl += fconn->drp" overflows
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to 0 when contentLength=65535 and paddingLength>=1. This causes the
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state machine to consider the record complete without consuming any
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buffer data. The remaining buffer contents are then parsed as new FCGI
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record headers.
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The same drl+=drp pattern at lines 2382/2418/2475 is not affected
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because drl is guaranteed to be 0 at those points (all content bytes
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are consumed before reaching end_transfer).
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Widen drl from uint16_t to uint32_t so that the addition of drp
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(uint8_t, max 255) cannot overflow.
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Reported-by: Tristan (@TristanInSec)
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---
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src/mux_fcgi.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
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index c956b58add56..8d81ff8499de 100644
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--- a/src/mux_fcgi.c
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+++ b/src/mux_fcgi.c
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@@ -54,7 +54,7 @@ struct fcgi_conn {
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uint32_t flags; /* Connection flags: FCGI_CF_* */
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int16_t dsi; /* dmux stream ID (<0 = idle ) */
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- uint16_t drl; /* demux record length (if dsi >= 0) */
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+ uint32_t drl; /* demux record length (if dsi >= 0) */
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uint8_t drt; /* demux record type (if dsi >= 0) */
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uint8_t drp; /* demux record padding (if dsi >= 0) */
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@ -0,0 +1,37 @@
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From 9a6d1fe3f00d86ab4ea6ea6ea0a5d48fc058a513 Mon Sep 17 00:00:00 2001
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From: Tristan Madani <tristan@talencesecurity.com>
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Date: Tue, 16 Jun 2026 10:42:10 +0200
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Subject: [PATCH] BUG/MINOR: hpack-tbl: add missing NULL check after
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hpack_dht_defrag()
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hpack_dht_insert() has three call sites for hpack_dht_defrag(). Two of
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them (lines 293 and 306) correctly check for a NULL return and bail out
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with -1. The third (line 353, data-space defrag path) assigns the return
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value to dht and immediately dereferences it without a NULL check.
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When pool_head_hpack_tbl is exhausted, hpack_dht_alloc() returns NULL,
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hpack_dht_defrag() propagates it, and line 354 dereferences NULL+0x0a
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(offsetof wrap), crashing the worker with SIGSEGV.
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Add a NULL check consistent with the two other call sites.
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This must be backported to all stable versions.
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Reported-by: Tristan (@TristanInSec)
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---
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src/hpack-tbl.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/src/hpack-tbl.c b/src/hpack-tbl.c
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index 990d2f7ddf93..92a6f4435510 100644
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--- a/src/hpack-tbl.c
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+++ b/src/hpack-tbl.c
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@@ -351,6 +351,8 @@ int hpack_dht_insert(struct hpack_dht *dht, struct ist name, struct ist value)
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else {
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/* need to defragment the table before inserting upfront */
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dht = hpack_dht_defrag(dht);
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+ if (!dht)
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+ return -1;
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wrap = dht->wrap + 1;
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head = dht->head + 1;
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dht->dte[head].addr = dht->dte[dht->front].addr - (name.len + value.len);
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14
haproxy.spec
14
haproxy.spec
@ -8,7 +8,7 @@
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Name: haproxy
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Version: 2.8.14
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Release: 3%{?dist}
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Release: 4%{?dist}
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Summary: HAProxy reverse proxy for high availability environments
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License: GPLv2+
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@ -22,6 +22,8 @@ Source4: %{name}.sysconfig
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Source5: %{name}.sysusers
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Source6: halog.1
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Patch0: RHEL-126665-CVE-2025-11230-fix-denial-of-service-vulnerability-in-mjson-library.patch
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Patch1: RHEL-211066-CVE-2026-55203-fix-uint16_t-overflow-in-mux-fcgi.patch
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Patch2: RHEL-211074-CVE-2026-55204-add-missing-NULL-check-after-hpack_dht_defrag.patch
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BuildRequires: gcc
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BuildRequires: lua-devel
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@ -51,7 +53,9 @@ availability environments. Indeed, it can:
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%prep
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%setup -q
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%autopatch -p1
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%patch -p1 -P 0
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%patch -p1 -P 1
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%patch -p1 -P 2
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%build
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make %{?_smp_mflags} CPU="generic" TARGET="linux-glibc" USE_OPENSSL=1 USE_PCRE2=1 USE_SLZ=1 USE_LUA=1 USE_CRYPT_H=1 USE_SYSTEMD=1 USE_LINUX_TPROXY=1 USE_GETADDRINFO=1 USE_PROMEX=1 ADDINC="%{build_cflags}" ADDLIB="%{build_ldflags}"
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@ -133,6 +137,12 @@ echo "d /var/lib/haproxy 0755 root root - -" > %{buildroot}%{_tmpfilesdir}/%{nam
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%{_tmpfilesdir}/%{name}.conf
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%changelog
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* Mon Aug 10 2026 Oyvind Albrigtsen <oalbrigt@redhat.com> - 2.8.14-4
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- Fix uint16_t overflow in FCGI demux record length (CVE-2026-55203)
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Resolves: RHEL-211066
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- Fix NULL pointer dereference in hpack_dht_insert() (CVE-2026-55204)
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Resolves: RHEL-211074
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* Thu Nov 6 2025 Oyvind Albrigtsen <oalbrigt@redhat.com> - 2.8.14-3
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- Fix denial of service vulnerability in mjson library (CVE-2025-11230)
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Resolves: RHEL-126665
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