medium 6.2

CVE-2025-10536 json

Information disclosure in the Networking: Cache component

published 2025-09-16 13 mo ago modified 2026-10-23 16 d ago also EUVD-2025-29558

cvss: 6.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

Information disclosure in the Networking: Cache component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

Patch / fix

fixed in 4 distros 7

mozilla firefox 140.3, 143
mozilla firefox_esr 140.3, 143
mozilla thunderbird 140.3, 143
mozilla thunderbird_esr 140.3, 143

debian ubuntu red hat suse opensuse almalinux rocky linux

firefox-esr Debian 12 140.3.0esr-1~deb12u1
firefox-esr Debian 13 140.3.0esr-1~deb13u1
firefox-esr Debian 14 140.3.0esr-1
thunderbird Debian 12 1:140.3.0esr-1~deb12u1
thunderbird Debian 13 1:140.3.0esr-1~deb13u1
thunderbird Debian 14 1:140.3.0esr-1

debian advisories DEBIAN-CVE-2025-10536

thunderbird Ubuntu 22.04 LTS 1:140.7.1+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2025-10536

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

thunderbird RHEL 8 140.3.0-1.el8_10
firefox RHEL 8 140.3.0-1.el8_10
thunderbird RHEL 10.0 140.3.0-1.el10_0
thunderbird RHEL 9 140.3.0-1.el9_6
firefox RHEL 9 140.3.0-1.el9_6
firefox-x11 RHEL 9 140.3.0-1.el9_6
firefox RHEL 10.0 140.3.0-1.el10_0
firefox RHEL 7 ELS 140.3.0-1.el7_9

red hat advisories RHSA-2025:17453 RHSA-2025:17378 RHSA-2025:17374 RHSA-2025:17372 RHSA-2025:17368 RHSA-2025:17371

MozillaFirefox SLES for SAP applications 16.0, SLES 16.0 140.5.0-160000.1.1
MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Workstation Extension 15 SP6, SLE Module for Package Hub 15 SP7 +2 more 140.3.0-150200.8.239.1
MozillaFirefox SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES for SAP 15 SP3 +12 more 140.3.0-150200.152.201.1

suse advisories SUSE-SU-2025:21021-1 SUSE-SU-2025:03309-1 SUSE-SU-2025:03291-1

MozillaFirefox openSUSE Leap 16.0 140.5.0-160000.1.1
MozillaThunderbird openSUSE Leap 16.0 140.3.0-bp160.1.1
MozillaFirefox openSUSE Tumbleweed 143.0-1.1
MozillaThunderbird openSUSE Tumbleweed 140.3.0-1.1
firefox-esr openSUSE Tumbleweed 140.3.0-1.1

opensuse advisories openSUSE-SU-2025:20065-1 openSUSE-SU-2025:20021-1 openSUSE-SU-2025:15565-1 openSUSE-SU-2025:15560-1 openSUSE-SU-2025:15555-1

thunderbird AlmaLinux 8 140.3.0-1.el8_10.alma.1
firefox AlmaLinux 8 140.3.0-1.el8_10.alma.1
thunderbird AlmaLinux 9 140.3.0-1.el9_6.alma.1
thunderbird AlmaLinux 10 140.3.0-1.el10_0.alma.1
firefox AlmaLinux 9 140.3.0-1.el9_6.alma.1
firefox-x11 AlmaLinux 9 140.3.0-1.el9_6.alma.1
firefox AlmaLinux 10 140.3.0-1.el10_0

almalinux advisories ALSA-2025:16589 ALSA-2025:16260 ALSA-2025:16156 ALSA-2025:16157 ALSA-2025:16108 ALSA-2025:16109

firefox Rocky Linux 9 140.3.0-1.el9_6
thunderbird Rocky Linux 9 140.3.0-1.el9_6
firefox Rocky Linux 10 140.3.0-1.el10_0
thunderbird Rocky Linux 10 140.3.0-1.el10_0
firefox Rocky Linux 8 140.3.0-1.el8_10
thunderbird Rocky Linux 8 140.3.0-1.el8_10

rocky linux advisories RLSA-2025:16108 RLSA-2025:16156 RLSA-2025:16109 RLSA-2025:16157 RLSA-2025:16260 RLSA-2025:16589

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-10536 updated 2026-11-07 cvss 3.4

firefox: thunderbird: Information disclosure in the Networking: Cache component

Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbird
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise Linux 10 firefox-flatpak, thunderbird-flatpak
affected: workaround, no fix available
Red Hat Enterprise Linux AppStream (v. 8) firefox 140.3.0-1.el8_10, thunderbird 140.3.0-1.el8_10
fixed: vendor fix RHSA-2025:16260
Red Hat Enterprise Linux AppStream (v. 9) firefox 140.3.0-1.el9_6, firefox-x11 140.3.0-1.el9_6, thunderbird 140.3.0-1.el9_6
fixed: vendor fix RHSA-2025:16108
Red Hat Enterprise Linux AppStream (v. 10) firefox 140.3.0-1.el10_0, thunderbird 140.3.0-1.el10_0
fixed: vendor fix RHSA-2025:16109
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 140.3.0-1.el8_2, thunderbird 140.3.0-1.el8_2
fixed: vendor fix RHSA-2025:17372
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 140.3.0-1.el8_4, thunderbird 140.3.0-1.el8_4
fixed: vendor fix RHSA-2025:17371
Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 140.3.0-1.el8_6, thunderbird 140.3.0-1.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 140.3.0-1.el8_6, thunderbird 140.3.0-1.el8_6
fixed: vendor fix RHSA-2025:17367

show 8 more

Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox 140.3.0-1.el8_8, thunderbird 140.3.0-1.el8_8
fixed: vendor fix RHSA-2025:17368
Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 140.3.0-1.el9_0, thunderbird 140.3.0-1.el9_0
fixed: vendor fix RHSA-2025:17373
Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox 140.3.0-1.el9_2, firefox-x11 140.3.0-1.el9_2, thunderbird 140.3.0-1.el9_2
fixed: vendor fix RHSA-2025:17374
Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox 140.3.0-1.el9_4, firefox-x11 140.3.0-1.el9_4, thunderbird 140.3.0-1.el9_4
fixed: vendor fix RHSA-2025:17378
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox 140.3.0-1.el8_4, thunderbird 140.3.0-1.el8_4
fixed: vendor fix RHSA-2025:17371
Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox 140.3.0-1.el8_6, thunderbird 140.3.0-1.el8_6
fixed: vendor fix RHSA-2025:17367
Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox 140.3.0-1.el8_8, thunderbird 140.3.0-1.el8_8
fixed: vendor fix RHSA-2025:17368
Red Hat Enterprise Linux Server (v. 7 ELS) firefox 140.3.0-1.el7_9
fixed: vendor fix RHSA-2025:17453

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 13 mo ago (2025-09-22)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.2	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA	3.1	6.2	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Mozilla Firefox
Mozilla Thunderbird

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

mozilla.org /security/advisories/mfsa2025-73/
vendor-advisory
mozilla.org /security/advisories/mfsa2025-75/
vendor-advisory
mozilla.org /security/advisories/mfsa2025-77/
vendor-advisory
mozilla.org /security/advisories/mfsa2025-78/
vendor-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1981502
issue-tracking, permissions-required
lists.debian.org /debian-lts-announce/2025/09/msg00026.html
lists.debian.org /debian-lts-announce/2025/09/msg00020.html

Sources

CVE List CVE-2025-10536
NVD CVE-2025-10536

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary