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Fencer Intel
medium 5.3

CVE-2026-33809 json

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

published 7mo ago modified last mo. also EUVD-2026-15960 , GHSA-44p7-9xx4-hf2g , GO-2026-4815

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

Is CVE-2026-33809 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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
7mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
GitHub 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

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 Intel 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.