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Fencer Vulns
medium 5.3

CVE-2026-33809 json

OOM from malicious IFD offset in golang.org/x/image/tiff

published 2026-03-25 7 mo ago modified 2026-09-10 1 mo ago also GHSA-44p7-9xx4-hf2g , GO-2026-4815 , EUVD-2026-15960

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

A maliciously crafted TIFF file can cause image decoding to attempt to allocate up 4GiB of memory, causing either excessive resource consumption or an out-of-memory error.

Patch / fix

  • go golang.org/x/image 0.38.0
  • golang.org/x/image golang.org/x/image/tiff 0.38.0
  • golang-golang-x-image Debian 14 0.38.0-1

debian advisories DEBIAN-CVE-2026-33809

  • golang1.25 hummingbird 1 1.25.9-1.hum1
  • golang1.25-bin hummingbird 1 1.25.9-1.hum1
  • golang1.25-src hummingbird 1 1.25.9-1.hum1
  • golang1.25-misc hummingbird 1 1.25.9-1.hum1
  • golang1.25-tests hummingbird 1 1.25.9-1.hum1
  • golang1.25-shared hummingbird 1 1.25.9-1.hum1
  • golang1.26 hummingbird 1 1.26.2-1.hum1
  • golang1.26-bin hummingbird 1 1.26.2-1.hum1

red hat advisories RHSA-2026:7385RHSA-2026:7291

  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2

suse advisories SUSE-SU-2026:1135-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • rclone openSUSE Leap 16.0 1.74.4-bp160.1.1
  • gomuks openSUSE Tumbleweed 26.03+git.1780250926.564a8707-1.1
  • neonmodem openSUSE Leap 16.0 1.0.7+git0.346d1d3-bp160.1.1
  • rclone openSUSE Tumbleweed 1.74.2-1.1
  • pocketbase openSUSE Tumbleweed 0.37.3-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21436-1openSUSE-SU-2026:11290-1openSUSE-SU-2026:20963-1openSUSE-SU-2026:10856-1openSUSE-SU-2026:10628-1

  • rclone Alpine 3.24 1.73.5-r0

alpine advisories ALPINE-CVE-2026-33809

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-33809 updated cvss 6.5

golang: golang.org/x/image/tiff: golang.org/x/image/tiff: Denial of Service via maliciously crafted TIFF file

  • Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator Red Hat OpenShift Service Mesh 2 ossm-2/openshift-golang-builder-container Red Hat OpenShift Service Mesh 3 ossm-2/openshift-golang-builder-container Red Hat Enterprise Linux 8 golang, go-toolset, golang-bin, golang-src, golang-misc, golang-race, +1 more Red Hat Enterprise Linux 9 golang, go-toolset, golang-bin, golang-src, golang-misc, golang-race, +1 more
    +4 more products
    Red Hat Enterprise Linux 10 golang Red Hat Enterprise Linux AI (RHEL AI) 3 golang Red Hat OpenShift Container Platform 4 openshift4/ose-tests-rhel9, ossm-2/openshift-golang-builder-container Red Hat OpenShift Virtualization 4 ossm-2/openshift-golang-builder-container
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images golang1.25 1.25.9-1.hum1, golang1.26 1.26.2-1.hum1, golang1.25-bin 1.25.9-1.hum1, golang1.25-src 1.25.9-1.hum1, golang1.26-bin 1.26.2-1.hum1, golang1.26-src 1.26.2-1.hum1, +6 more
    fixed: vendor fix RHSA-2026:7385

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
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go golang.org/x/image
<0.38.0
0.38.0

Affected products

  • golang.org/x/image golang.org/x/image/tiff

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

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.